Reference · 126 grade and size combinations

Bolt torque chart

Torque is not a property of a bolt. It is an estimate of the torque that will produce a chosen preload in a particular joint, so every row below is worked out from the three inputs at four lubrication conditions, with the figures the published charts print listed under each grade. Search the page for a size such as 1/2-13 or M12 to jump to its row.

T = K x D x P

T = K x D x P. D is the nominal diameter and P is the target preload, taken here as 75 percent of the proof load. K is the nut factor: a single empirical number standing in for the friction in the threads and under the head, and it is where every disagreement between torque charts comes from. Nothing on these pages is a torque measured on a joint - the published columns are what named charts printed, and the estimate columns are this equation with the K, D and P shown beside the answer.

The nut factor for each lubrication condition, with the spread across the published charts.
Condition	K used	K published range	Note
Waxed, moly or a proprietary lubricant coating	0.13	0.12 to 0.16	The metric chart cross-checked here uses 0.13 for its coated product and notes that a wax-lubricated zinc top-lock nut runs anywhere from 0.12 to 0.16.
Lubricated threads and bearing face	0.15	0.15	All three charts that state a nut factor use 0.15 for lubricated.
Zinc plated and dry	0.17	0.17 to 0.18	The two inch charts disagree: 0.17 in one, 0.18 in the other. The lower figure is used for the headline estimate and the spread is printed, because on a 1/2-13 Grade 5 bolt it is the difference between 64 and 68 lb-ft.
Plain and dry, as received	0.2	0.2	The default when nothing is specified. Every chart cross-checked here uses 0.20.

Preload target on every page in this section is 75 percent of proof load. Every chart cross-checked here targets 75 percent of proof load, so the disagreements between them are about K alone. A chart that targets 65 percent, as some do for reusable joints, will give figures about 13 percent lower for the same fastener and the same K. Always read the clamp fraction before comparing two charts.

What a torque figure is worth

A torque figure is an estimate of preload, not a measurement of it. Even with the right K, torque control typically lands the preload within about plus or minus 25 to 30 percent, because almost all of the applied torque goes into friction rather than stretch. Where the preload actually matters, measure it - turn of the nut, bolt elongation, a load-indicating washer or a tensioner - rather than trusting a wrench setting. And a torque table cannot know what your joint is made of: it assumes the threads and the clamped material can carry the preload the bolt can.

Frequently asked questions

What does K factor mean in a torque chart?

K is the nut factor in T = K x D x P: a single empirical number standing in for the friction in the threads and under the head, and it is where every disagreement between torque charts comes from. The charts cross-checked here use 0.20 for plain and dry threads and 0.15 for lubricated ones, with zinc-plated and waxed conditions in between.

Are these bolt torque values exact?

Does lubrication change bolt torque?

Yes, substantially. Every chart cross-checked here uses a nut factor of 0.20 for plain and dry threads and 0.15 for lubricated ones, so the same fastener needs noticeably less torque lubricated to reach the same preload. Using the dry figure on lubricated threads overloads the bolt; using the lubricated figure on dry threads leaves the joint loose.

What does proof load mean?

Proof load is the load the grade's standard requires the bolt to carry - published in SAE J429 for inch grades and ISO 898-1 for metric property classes, and banded by diameter. It is the P behind every figure here: each row targets a preload of 75 percent of the published proof load, and a grade with no published proof load gets no torque row at all.

62 sizes

Inch sizes, SAE J429 grades

SAE Grade 5

SAE Grade 5 torque estimates by size and lubrication condition.
Size	Series	Clamp load	K = 0.13	K = 0.15	K = 0.17	K = 0.2	Charts
1-1/2-12	UNF	87,750 lbf	1426 lb-ft	1645 lb-ft	1865 lb-ft	2194 lb-ft	1
1-1/2-6	UNC	78,000 lbf	1268 lb-ft	1463 lb-ft	1658 lb-ft	1950 lb-ft	1
1-1/4-12	UNF	59,550 lbf	806 lb-ft	930 lb-ft	1055 lb-ft	1241 lb-ft	1
1-1/4-7	UNC	53,775 lbf	728 lb-ft	840 lb-ft	952 lb-ft	1120 lb-ft	1
1-8	UNC	38,625 lbf	418 lb-ft	483 lb-ft	547 lb-ft	644 lb-ft	3
1/2-13	UNC	9,075 lbf	49 lb-ft	57 lb-ft	64 lb-ft	76 lb-ft	3
1/2-20	UNF	10,200 lbf	55 lb-ft	64 lb-ft	72 lb-ft	85 lb-ft	2
1/4-20	UNC	2,025 lbf	66 lb-in	76 lb-in	86 lb-in	101 lb-in	3
1/4-28	UNF	2,325 lbf	76 lb-in	87 lb-in	99 lb-in	116 lb-in	3
3/4-10	UNC	21,300 lbf	173 lb-ft	200 lb-ft	226 lb-ft	266 lb-ft	3
3/4-16	UNF	23,775 lbf	193 lb-ft	223 lb-ft	253 lb-ft	297 lb-ft	2
3/8-16	UNC	4,950 lbf	20 lb-ft	23 lb-ft	26 lb-ft	31 lb-ft	3
3/8-24	UNF	5,588 lbf	23 lb-ft	26 lb-ft	30 lb-ft	35 lb-ft	3
5/16-18	UNC	3,338 lbf	11 lb-ft	13 lb-ft	15 lb-ft	17 lb-ft	2
5/16-24	UNF	3,675 lbf	12 lb-ft	14 lb-ft	16 lb-ft	19 lb-ft	2
5/8-11	UNC	14,400 lbf	98 lb-ft	113 lb-ft	128 lb-ft	150 lb-ft	3
5/8-18	UNF	16,350 lbf	111 lb-ft	128 lb-ft	145 lb-ft	170 lb-ft	2
7/16-14	UNC	6,788 lbf	32 lb-ft	37 lb-ft	42 lb-ft	49 lb-ft	2
7/16-20	UNF	7,575 lbf	36 lb-ft	41 lb-ft	47 lb-ft	55 lb-ft	2
7/8-14	UNF	32,475 lbf	308 lb-ft	355 lb-ft	403 lb-ft	474 lb-ft	2
7/8-9	UNC	29,475 lbf	279 lb-ft	322 lb-ft	365 lb-ft	430 lb-ft	3
9/16-12	UNC	11,625 lbf	71 lb-ft	82 lb-ft	93 lb-ft	109 lb-ft	1

What the published charts print for SAE Grade 5

1-1/2-12: lubricated 1645 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 1865 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 2194 lb-ft (Fastenal, K 0.2, 75% of proof).
1-1/2-6: lubricated 1462 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 1657 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 1950 lb-ft (Fastenal, K 0.2, 75% of proof).
1-1/4-12: lubricated 930 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 1055 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 1241 lb-ft (Fastenal, K 0.2, 75% of proof).
1-1/4-7: lubricated 840 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 952 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 1121 lb-ft (Fastenal, K 0.2, 75% of proof).
1-8: lubricated 483 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 547 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 644 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 483 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 579 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 644 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 640 lb-ft (WorkshopCalc, K 0.199 implied, 75% of proof); lubricated 480 lb-ft (WorkshopCalc, K 0.149 implied, 75% of proof).
1/2-13: lubricated 57 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 64 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 75 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 57 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 68 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 75 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 75 lb-ft (WorkshopCalc, K 0.199 implied, 75% of proof); lubricated 56 lb-ft (WorkshopCalc, K 0.149 implied, 75% of proof).
1/2-20: lubricated 64 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 72 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 85 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 64 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 76 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 85 lb-ft (Engineers Edge, K 0.2, 75% of proof).
1/4-20: lubricated 76 lb-in (Fastenal, K 0.15, 75% of proof); zinc plated and dry 86 lb-in (Fastenal, K 0.17, 75% of proof); plain and dry 101 lb-in (Fastenal, K 0.2, 75% of proof); lubricated 76 lb-in (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 91 lb-in (Engineers Edge, K 0.18, 75% of proof); plain and dry 101 lb-in (Engineers Edge, K 0.2, 75% of proof); plain and dry 8 lb-ft (WorkshopCalc, K not stated, 75% of proof); lubricated 6 lb-ft (WorkshopCalc, K not stated, 75% of proof).
1/4-28: lubricated 87 lb-in (Fastenal, K 0.15, 75% of proof); zinc plated and dry 99 lb-in (Fastenal, K 0.17, 75% of proof); plain and dry 116 lb-in (Fastenal, K 0.2, 75% of proof); lubricated 87 lb-in (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 104 lb-in (Engineers Edge, K 0.18, 75% of proof); plain and dry 116 lb-in (Engineers Edge, K 0.2, 75% of proof); plain and dry 10 lb-ft (WorkshopCalc, K 0.207 implied, 75% of proof); lubricated 7 lb-ft (WorkshopCalc, K not stated, 75% of proof).
3/4-10: lubricated 200 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 227 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 267 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 200 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 240 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 267 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 260 lb-ft (WorkshopCalc, K 0.195 implied, 75% of proof); lubricated 195 lb-ft (WorkshopCalc, K 0.146 implied, 75% of proof).
3/4-16: lubricated 223 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 253 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 297 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 223 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 267 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 297 lb-ft (Engineers Edge, K 0.2, 75% of proof).
3/8-16: lubricated 23 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 26 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 31 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 23 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 28 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 31 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 31 lb-ft (WorkshopCalc, K 0.201 implied, 75% of proof); lubricated 23 lb-ft (WorkshopCalc, K 0.149 implied, 75% of proof).
3/8-24: lubricated 26 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 30 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 35 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 26 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 31 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 35 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 35 lb-ft (WorkshopCalc, K 0.2 implied, 75% of proof); lubricated 26 lb-ft (WorkshopCalc, K 0.149 implied, 75% of proof).
5/16-18: lubricated 157 lb-in (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 188 lb-in (Engineers Edge, K 0.18, 75% of proof); plain and dry 209 lb-in (Engineers Edge, K 0.2, 75% of proof); plain and dry 17 lb-ft (WorkshopCalc, K 0.195 implied, 75% of proof); lubricated 13 lb-ft (WorkshopCalc, K 0.149 implied, 75% of proof).
5/16-24: lubricated 174 lb-in (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 208 lb-in (Engineers Edge, K 0.18, 75% of proof); plain and dry 231 lb-in (Engineers Edge, K 0.2, 75% of proof); plain and dry 19 lb-ft (WorkshopCalc, K 0.197 implied, 75% of proof); lubricated 14 lb-ft (WorkshopCalc, K 0.145 implied, 75% of proof).
5/8-11: lubricated 113 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 128 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 150 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 113 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 135 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 150 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 150 lb-ft (WorkshopCalc, K 0.2 implied, 75% of proof); lubricated 112 lb-ft (WorkshopCalc, K 0.149 implied, 75% of proof).
5/8-18: lubricated 127 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 144 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 170 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 127 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 153 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 170 lb-ft (Engineers Edge, K 0.2, 75% of proof).
7/16-14: lubricated 37 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 44 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 49 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 49 lb-ft (WorkshopCalc, K 0.198 implied, 75% of proof); lubricated 37 lb-ft (WorkshopCalc, K 0.15 implied, 75% of proof).
7/16-20: lubricated 41 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 50 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 55 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 55 lb-ft (WorkshopCalc, K 0.199 implied, 75% of proof); lubricated 41 lb-ft (WorkshopCalc, K 0.149 implied, 75% of proof).
7/8-14: lubricated 355 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 403 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 474 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 355 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 426 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 474 lb-ft (Engineers Edge, K 0.2, 75% of proof).
7/8-9: lubricated 322 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 365 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 429 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 322 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 386 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 429 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 430 lb-ft (WorkshopCalc, K 0.2 implied, 75% of proof); lubricated 322 lb-ft (WorkshopCalc, K 0.15 implied, 75% of proof).
9/16-12: plain and dry 110 lb-ft (WorkshopCalc, K 0.202 implied, 75% of proof); lubricated 82 lb-ft (WorkshopCalc, K 0.15 implied, 75% of proof).

SAE Grade 8

SAE Grade 8 torque estimates by size and lubrication condition.
Size	Series	Clamp load	K = 0.13	K = 0.15	K = 0.17	K = 0.2	Charts
1-1/2-12	UNF	142,275 lbf	2312 lb-ft	2668 lb-ft	3023 lb-ft	3557 lb-ft	1
1-1/2-6	UNC	126,450 lbf	2055 lb-ft	2371 lb-ft	2687 lb-ft	3161 lb-ft	1
1-1/4-12	UNF	96,600 lbf	1308 lb-ft	1509 lb-ft	1711 lb-ft	2013 lb-ft	1
1-1/4-7	UNC	87,225 lbf	1181 lb-ft	1363 lb-ft	1545 lb-ft	1817 lb-ft	1
1-8	UNC	54,525 lbf	591 lb-ft	682 lb-ft	772 lb-ft	909 lb-ft	3
1/2-13	UNC	12,750 lbf	69 lb-ft	80 lb-ft	90 lb-ft	106 lb-ft	3
1/2-20	UNF	14,400 lbf	78 lb-ft	90 lb-ft	102 lb-ft	120 lb-ft	2
1/4-20	UNC	2,850 lbf	8 lb-ft	9 lb-ft	10 lb-ft	12 lb-ft	3
1/4-28	UNF	3,263 lbf	9 lb-ft	10 lb-ft	12 lb-ft	14 lb-ft	3
3/4-10	UNC	30,075 lbf	244 lb-ft	282 lb-ft	320 lb-ft	376 lb-ft	3
3/4-16	UNF	33,600 lbf	273 lb-ft	315 lb-ft	357 lb-ft	420 lb-ft	2
3/8-16	UNC	6,975 lbf	28 lb-ft	33 lb-ft	37 lb-ft	44 lb-ft	3
3/8-24	UNF	7,875 lbf	32 lb-ft	37 lb-ft	42 lb-ft	49 lb-ft	3
5/16-18	UNC	4,725 lbf	16 lb-ft	18 lb-ft	21 lb-ft	25 lb-ft	2
5/16-24	UNF	5,213 lbf	18 lb-ft	20 lb-ft	23 lb-ft	27 lb-ft	2
5/8-11	UNC	20,325 lbf	138 lb-ft	159 lb-ft	180 lb-ft	212 lb-ft	3
5/8-18	UNF	23,025 lbf	156 lb-ft	180 lb-ft	204 lb-ft	240 lb-ft	2
7/16-14	UNC	9,600 lbf	46 lb-ft	53 lb-ft	60 lb-ft	70 lb-ft	2
7/16-20	UNF	10,650 lbf	50 lb-ft	58 lb-ft	66 lb-ft	78 lb-ft	2
7/8-14	UNF	45,825 lbf	434 lb-ft	501 lb-ft	568 lb-ft	668 lb-ft	2
7/8-9	UNC	41,550 lbf	394 lb-ft	454 lb-ft	515 lb-ft	606 lb-ft	3
9/16-12	UNC	16,350 lbf	100 lb-ft	115 lb-ft	130 lb-ft	153 lb-ft	1

What the published charts print for SAE Grade 8

1-1/2-12: lubricated 2668 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 3024 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 3557 lb-ft (Fastenal, K 0.2, 75% of proof).
1-1/2-6: lubricated 2371 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 2688 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 3162 lb-ft (Fastenal, K 0.2, 75% of proof).
1-1/4-12: lubricated 1509 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 1710 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 2012 lb-ft (Fastenal, K 0.2, 75% of proof).
1-1/4-7: lubricated 1363 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 1545 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 1817 lb-ft (Fastenal, K 0.2, 75% of proof).
1-8: lubricated 681 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 772 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 909 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 681 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 818 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 909 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 910 lb-ft (WorkshopCalc, K 0.2 implied, 75% of proof); lubricated 682 lb-ft (WorkshopCalc, K 0.15 implied, 75% of proof).
1/2-13: lubricated 80 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 90 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 106 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 80 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 96 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 106 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 105 lb-ft (WorkshopCalc, K 0.197 implied, 75% of proof); lubricated 79 lb-ft (WorkshopCalc, K 0.148 implied, 75% of proof).
1/2-20: lubricated 90 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 102 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 120 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 90 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 108 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 120 lb-ft (Engineers Edge, K 0.2, 75% of proof).
1/4-20: lubricated 107 lb-in (Fastenal, K 0.15, 75% of proof); zinc plated and dry 122 lb-in (Fastenal, K 0.17, 75% of proof); plain and dry 143 lb-in (Fastenal, K 0.2, 75% of proof); lubricated 107 lb-in (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 129 lb-in (Engineers Edge, K 0.18, 75% of proof); plain and dry 143 lb-in (Engineers Edge, K 0.2, 75% of proof); plain and dry 12 lb-ft (WorkshopCalc, K 0.201 implied, 75% of proof); lubricated 9 lb-ft (WorkshopCalc, K not stated, 75% of proof).
1/4-28: lubricated 123 lb-in (Fastenal, K 0.15, 75% of proof); zinc plated and dry 139 lb-in (Fastenal, K 0.17, 75% of proof); plain and dry 164 lb-in (Fastenal, K 0.2, 75% of proof); lubricated 123 lb-in (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 147 lb-in (Engineers Edge, K 0.18, 75% of proof); plain and dry 164 lb-in (Engineers Edge, K 0.2, 75% of proof); plain and dry 14 lb-ft (WorkshopCalc, K 0.205 implied, 75% of proof); lubricated 10 lb-ft (WorkshopCalc, K 0.147 implied, 75% of proof).
3/4-10: lubricated 282 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 320 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 376 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 282 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 339 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 376 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 375 lb-ft (WorkshopCalc, K 0.199 implied, 75% of proof); lubricated 281 lb-ft (WorkshopCalc, K 0.149 implied, 75% of proof).
3/4-16: lubricated 315 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 357 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 420 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 315 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 378 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 420 lb-ft (Engineers Edge, K 0.2, 75% of proof).
3/8-16: lubricated 33 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 37 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 44 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 33 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 39 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 44 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 44 lb-ft (WorkshopCalc, K 0.202 implied, 75% of proof); lubricated 33 lb-ft (WorkshopCalc, K 0.151 implied, 75% of proof).
3/8-24: lubricated 37 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 42 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 49 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 37 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 44 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 49 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 49 lb-ft (WorkshopCalc, K 0.198 implied, 75% of proof); lubricated 37 lb-ft (WorkshopCalc, K 0.15 implied, 75% of proof).
5/16-18: lubricated 221 lb-in (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 265 lb-in (Engineers Edge, K 0.18, 75% of proof); plain and dry 295 lb-in (Engineers Edge, K 0.2, 75% of proof); plain and dry 24 lb-ft (WorkshopCalc, K 0.195 implied, 75% of proof); lubricated 18 lb-ft (WorkshopCalc, K 0.146 implied, 75% of proof).
5/16-24: lubricated 245 lb-in (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 294 lb-in (Engineers Edge, K 0.18, 75% of proof); plain and dry 327 lb-in (Engineers Edge, K 0.2, 75% of proof); plain and dry 27 lb-ft (WorkshopCalc, K 0.198 implied, 75% of proof); lubricated 20 lb-ft (WorkshopCalc, K 0.147 implied, 75% of proof).
5/8-11: lubricated 159 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 180 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 212 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 159 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 191 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 212 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 210 lb-ft (WorkshopCalc, K 0.198 implied, 75% of proof); lubricated 158 lb-ft (WorkshopCalc, K 0.149 implied, 75% of proof).
5/8-18: lubricated 180 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 204 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 240 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 180 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 216 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 240 lb-ft (Engineers Edge, K 0.2, 75% of proof).
7/16-14: lubricated 52 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 63 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 70 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 70 lb-ft (WorkshopCalc, K 0.201 implied, 75% of proof); lubricated 52 lb-ft (WorkshopCalc, K 0.149 implied, 75% of proof).
7/16-20: lubricated 58 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 70 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 78 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 78 lb-ft (WorkshopCalc, K 0.2 implied, 75% of proof); lubricated 58 lb-ft (WorkshopCalc, K 0.149 implied, 75% of proof).
7/8-14: lubricated 502 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 568 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 669 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 502 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 602 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 669 lb-ft (Engineers Edge, K 0.2, 75% of proof).
7/8-9: lubricated 455 lb-ft (Fastenal, K 0.15, 75% of proof); zinc plated and dry 515 lb-ft (Fastenal, K 0.17, 75% of proof); plain and dry 606 lb-ft (Fastenal, K 0.2, 75% of proof); lubricated 455 lb-ft (Engineers Edge, K 0.15, 75% of proof); zinc plated and dry 545 lb-ft (Engineers Edge, K 0.18, 75% of proof); plain and dry 606 lb-ft (Engineers Edge, K 0.2, 75% of proof); plain and dry 605 lb-ft (WorkshopCalc, K 0.2 implied, 75% of proof); lubricated 454 lb-ft (WorkshopCalc, K 0.15 implied, 75% of proof).
9/16-12: plain and dry 155 lb-ft (WorkshopCalc, K 0.202 implied, 75% of proof); lubricated 116 lb-ft (WorkshopCalc, K 0.151 implied, 75% of proof).

SAE Grade 2

SAE Grade 2 torque estimates by size and lubrication condition.
Size	Series	Clamp load	K = 0.13	K = 0.15	K = 0.17	K = 0.2	Charts
1-8	UNC	15,000 lbf	163 lb-ft	188 lb-ft	213 lb-ft	250 lb-ft	2
1/2-13	UNC	5,850 lbf	32 lb-ft	37 lb-ft	41 lb-ft	49 lb-ft	2
1/2-20	UNF	6,600 lbf	36 lb-ft	41 lb-ft	47 lb-ft	55 lb-ft	1
1/4-20	UNC	1,313 lbf	43 lb-in	49 lb-in	56 lb-in	66 lb-in	2
1/4-28	UNF	1,500 lbf	49 lb-in	56 lb-in	64 lb-in	75 lb-in	2
3/4-10	UNC	13,800 lbf	112 lb-ft	129 lb-ft	147 lb-ft	173 lb-ft	2
3/4-16	UNF	15,375 lbf	125 lb-ft	144 lb-ft	163 lb-ft	192 lb-ft	1
3/8-16	UNC	3,188 lbf	13 lb-ft	15 lb-ft	17 lb-ft	20 lb-ft	2
3/8-24	UNF	3,600 lbf	15 lb-ft	17 lb-ft	19 lb-ft	23 lb-ft	2
5/16-18	UNC	2,175 lbf	7 lb-ft	8 lb-ft	10 lb-ft	11 lb-ft	2
5/16-24	UNF	2,400 lbf	8 lb-ft	9 lb-ft	11 lb-ft	13 lb-ft	2
5/8-11	UNC	9,300 lbf	63 lb-ft	73 lb-ft	82 lb-ft	97 lb-ft	2
5/8-18	UNF	10,575 lbf	72 lb-ft	83 lb-ft	94 lb-ft	110 lb-ft	1
7/16-14	UNC	4,388 lbf	21 lb-ft	24 lb-ft	27 lb-ft	32 lb-ft	2
7/16-20	UNF	4,913 lbf	23 lb-ft	27 lb-ft	30 lb-ft	36 lb-ft	2
7/8-14	UNF	12,600 lbf	119 lb-ft	138 lb-ft	156 lb-ft	184 lb-ft	1
7/8-9	UNC	11,400 lbf	108 lb-ft	125 lb-ft	141 lb-ft	166 lb-ft	2
9/16-12	UNC	7,500 lbf	46 lb-ft	53 lb-ft	60 lb-ft	70 lb-ft	1

What the published charts print for SAE Grade 2

64 sizes

Metric sizes, ISO 898-1 property classes

ISO property class 4.6

ISO property class 4.6 torque estimates by size and lubrication condition.
Size	Series	Clamp load	K = 0.13	K = 0.15	K = 0.17	K = 0.2	Charts
M5	Metric coarse	2.4 kN	1.6 N-m	1.8 N-m	2.0 N-m	2.4 N-m	1
M6	Metric coarse	3.4 kN	2.6 N-m	3.1 N-m	3.5 N-m	4.1 N-m	1
M8	Metric coarse	6.2 kN	6.4 N-m	7.4 N-m	8.4 N-m	9.9 N-m	1
M10	Metric coarse	9.8 kN	12.7 N-m	14.7 N-m	16.6 N-m	19.6 N-m	1
M12	Metric coarse	14.2 kN	22.2 N-m	25.6 N-m	29.0 N-m	34.1 N-m	1
M14	Metric coarse	19.4 kN	35.3 N-m	40.8 N-m	46.2 N-m	54.3 N-m	1
M16	Metric coarse	26.5 kN	55.1 N-m	63.6 N-m	72.1 N-m	84.8 N-m	1
M18	Metric coarse	32.4 kN	75.8 N-m	87.5 N-m	99.1 N-m	117 N-m	1
M20	Metric coarse	41.3 kN	107 N-m	124 N-m	141 N-m	165 N-m	1
M22	Metric coarse	51.1 kN	146 N-m	169 N-m	191 N-m	225 N-m	1
M24	Metric coarse	59.6 kN	186 N-m	214 N-m	243 N-m	286 N-m	1
M27	Metric coarse	77.5 kN	272 N-m	314 N-m	356 N-m	418 N-m	1
M30	Metric coarse	94.7 kN	369 N-m	426 N-m	483 N-m	568 N-m	1
M33	Metric coarse	117.1 kN	502 N-m	580 N-m	657 N-m	773 N-m	1
M36	Metric coarse	137.9 kN	645 N-m	744 N-m	844 N-m	993 N-m	1
M39	Metric coarse	164.7 kN	835 N-m	963 N-m	1092 N-m	1285 N-m	1

What the published charts print for ISO property class 4.6

M5: coated with a proprietary lubricant 1.6 N-m (Fastenal, K 0.13, 75% of proof); lubricated 1.9 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 2.4 N-m (Fastenal, K 0.2, 75% of proof).
M6: coated with a proprietary lubricant 2.6 N-m (Fastenal, K 0.13, 75% of proof); lubricated 3.3 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 4.1 N-m (Fastenal, K 0.2, 75% of proof).
M8: coated with a proprietary lubricant 6.4 N-m (Fastenal, K 0.13, 75% of proof); lubricated 7.9 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 9.9 N-m (Fastenal, K 0.2, 75% of proof).
M10: coated with a proprietary lubricant 12.7 N-m (Fastenal, K 0.13, 75% of proof); lubricated 15.7 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 19.6 N-m (Fastenal, K 0.2, 75% of proof).
M12: coated with a proprietary lubricant 22.2 N-m (Fastenal, K 0.13, 75% of proof); lubricated 27.3 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 34.1 N-m (Fastenal, K 0.2, 75% of proof).
M14: coated with a proprietary lubricant 35.3 N-m (Fastenal, K 0.13, 75% of proof); lubricated 43.5 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 54.3 N-m (Fastenal, K 0.2, 75% of proof).
M16: coated with a proprietary lubricant 55.1 N-m (Fastenal, K 0.13, 75% of proof); lubricated 67.8 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 84.8 N-m (Fastenal, K 0.2, 75% of proof).
M18: coated with a proprietary lubricant 75.8 N-m (Fastenal, K 0.13, 75% of proof); lubricated 93.3 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 117 N-m (Fastenal, K 0.2, 75% of proof).
M20: coated with a proprietary lubricant 107 N-m (Fastenal, K 0.13, 75% of proof); lubricated 132 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 165 N-m (Fastenal, K 0.2, 75% of proof).
M22: coated with a proprietary lubricant 146 N-m (Fastenal, K 0.13, 75% of proof); lubricated 180 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 225 N-m (Fastenal, K 0.2, 75% of proof).
M24: coated with a proprietary lubricant 186 N-m (Fastenal, K 0.13, 75% of proof); lubricated 229 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 286 N-m (Fastenal, K 0.2, 75% of proof).
M27: coated with a proprietary lubricant 272 N-m (Fastenal, K 0.13, 75% of proof); lubricated 335 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 418 N-m (Fastenal, K 0.2, 75% of proof).
M30: coated with a proprietary lubricant 369 N-m (Fastenal, K 0.13, 75% of proof); lubricated 454 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 568 N-m (Fastenal, K 0.2, 75% of proof).
M33: coated with a proprietary lubricant 502 N-m (Fastenal, K 0.13, 75% of proof); lubricated 618 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 773 N-m (Fastenal, K 0.2, 75% of proof).
M36: coated with a proprietary lubricant 645 N-m (Fastenal, K 0.13, 75% of proof); lubricated 794 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 993 N-m (Fastenal, K 0.2, 75% of proof).
M39: coated with a proprietary lubricant 835 N-m (Fastenal, K 0.13, 75% of proof); lubricated 1028 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 1285 N-m (Fastenal, K 0.2, 75% of proof).

ISO property class 8.8

ISO property class 8.8 torque estimates by size and lubrication condition.
Size	Series	Clamp load	K = 0.13	K = 0.15	K = 0.17	K = 0.2	Charts
M5	Metric coarse	6.2 kN	4.0 N-m	4.6 N-m	5.3 N-m	6.2 N-m	2
M6	Metric coarse	8.7 kN	6.8 N-m	7.9 N-m	8.9 N-m	10.5 N-m	3
M8	Metric coarse	15.9 kN	16.6 N-m	19.1 N-m	21.7 N-m	25.5 N-m	3
M10	Metric coarse	25.2 kN	32.8 N-m	37.8 N-m	42.9 N-m	50.5 N-m	3
M12	Metric coarse	36.7 kN	57.2 N-m	66.0 N-m	74.8 N-m	88.0 N-m	3
M14	Metric coarse	50.0 kN	91.0 N-m	105 N-m	119 N-m	140 N-m	3
M16	Metric coarse	68.3 kN	142 N-m	164 N-m	186 N-m	219 N-m	3
M18	Metric coarse	86.4 kN	202 N-m	233 N-m	264 N-m	311 N-m	3
M20	Metric coarse	110.3 kN	287 N-m	331 N-m	375 N-m	441 N-m	3
M22	Metric coarse	136.3 kN	390 N-m	450 N-m	510 N-m	600 N-m	3
M24	Metric coarse	158.8 kN	496 N-m	572 N-m	648 N-m	762 N-m	3
M27	Metric coarse	206.6 kN	725 N-m	837 N-m	948 N-m	1115 N-m	1
M30	Metric coarse	252.4 kN	985 N-m	1136 N-m	1287 N-m	1515 N-m	1
M33	Metric coarse	312.3 kN	1340 N-m	1546 N-m	1752 N-m	2061 N-m	1
M36	Metric coarse	367.6 kN	1721 N-m	1985 N-m	2250 N-m	2647 N-m	1
M39	Metric coarse	439.2 kN	2227 N-m	2569 N-m	2912 N-m	3426 N-m	1

What the published charts print for ISO property class 8.8

M5: coated with a proprietary lubricant 4 N-m (Fastenal, K 0.13, 75% of proof); lubricated 4.6 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 6.2 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 4.9 N-m (Ecom Fasteners, K 0.159 implied, 75% of proof); lubricated 3.7 N-m (Ecom Fasteners, K 0.12 implied, 75% of proof). For lubricated the published charts give 4.6 N-m (torque-fastenal-metric), 3.7 N-m (torque-ecomfasteners). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 6.2 N-m (torque-fastenal-metric), 4.9 N-m (torque-ecomfasteners). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M6: coated with a proprietary lubricant 6.8 N-m (Fastenal, K 0.13, 75% of proof); lubricated 7.9 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 10.5 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 8.5 N-m (Ecom Fasteners, K 0.162 implied, 75% of proof); lubricated 6.4 N-m (Ecom Fasteners, K 0.122 implied, 75% of proof); plain and dry 9.9 N-m (WorkshopCalc, K 0.189 implied, 75% of proof); lubricated 7.4 N-m (WorkshopCalc, K 0.141 implied, 75% of proof). For lubricated the published charts give 7.9 N-m (torque-fastenal-metric), 6.4 N-m (torque-ecomfasteners), 7.4 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 10.5 N-m (torque-fastenal-metric), 8.5 N-m (torque-ecomfasteners), 9.9 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M8: coated with a proprietary lubricant 16.6 N-m (Fastenal, K 0.13, 75% of proof); lubricated 19.1 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 25.5 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 21 N-m (Ecom Fasteners, K 0.165 implied, 75% of proof); lubricated 16 N-m (Ecom Fasteners, K 0.126 implied, 75% of proof); plain and dry 24 N-m (WorkshopCalc, K 0.188 implied, 75% of proof); lubricated 18 N-m (WorkshopCalc, K 0.141 implied, 75% of proof). For lubricated the published charts give 19.1 N-m (torque-fastenal-metric), 16 N-m (torque-ecomfasteners), 18 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 25.5 N-m (torque-fastenal-metric), 21 N-m (torque-ecomfasteners), 24 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M10: coated with a proprietary lubricant 32.8 N-m (Fastenal, K 0.13, 75% of proof); lubricated 37.8 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 50.5 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 41 N-m (Ecom Fasteners, K 0.163 implied, 75% of proof); lubricated 31 N-m (Ecom Fasteners, K 0.123 implied, 75% of proof); plain and dry 48 N-m (WorkshopCalc, K 0.19 implied, 75% of proof); lubricated 36 N-m (WorkshopCalc, K 0.143 implied, 75% of proof). For lubricated the published charts give 37.8 N-m (torque-fastenal-metric), 31 N-m (torque-ecomfasteners), 36 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 50.5 N-m (torque-fastenal-metric), 41 N-m (torque-ecomfasteners), 48 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M12: coated with a proprietary lubricant 57.2 N-m (Fastenal, K 0.13, 75% of proof); lubricated 66 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 88 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 71 N-m (Ecom Fasteners, K 0.161 implied, 75% of proof); lubricated 53 N-m (Ecom Fasteners, K 0.12 implied, 75% of proof); plain and dry 84 N-m (WorkshopCalc, K 0.191 implied, 75% of proof); lubricated 63 N-m (WorkshopCalc, K 0.143 implied, 75% of proof). For lubricated the published charts give 66.0 N-m (torque-fastenal-metric), 53 N-m (torque-ecomfasteners), 63 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 88.0 N-m (torque-fastenal-metric), 71 N-m (torque-ecomfasteners), 84 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M14: coated with a proprietary lubricant 91 N-m (Fastenal, K 0.13, 75% of proof); lubricated 105 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 140 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 115 N-m (Ecom Fasteners, K 0.164 implied, 75% of proof); lubricated 86 N-m (Ecom Fasteners, K 0.123 implied, 75% of proof); plain and dry 135 N-m (WorkshopCalc, K 0.193 implied, 75% of proof); lubricated 101 N-m (WorkshopCalc, K 0.144 implied, 75% of proof). For lubricated the published charts give 105.0 N-m (torque-fastenal-metric), 86 N-m (torque-ecomfasteners), 101 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 140.0 N-m (torque-fastenal-metric), 115 N-m (torque-ecomfasteners), 135 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M16: coated with a proprietary lubricant 142 N-m (Fastenal, K 0.13, 75% of proof); lubricated 164 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 219 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 175 N-m (Ecom Fasteners, K 0.16 implied, 75% of proof); lubricated 131 N-m (Ecom Fasteners, K 0.12 implied, 75% of proof); plain and dry 210 N-m (WorkshopCalc, K 0.192 implied, 75% of proof); lubricated 157 N-m (WorkshopCalc, K 0.144 implied, 75% of proof). For lubricated the published charts give 164.0 N-m (torque-fastenal-metric), 131 N-m (torque-ecomfasteners), 157 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 219.0 N-m (torque-fastenal-metric), 175 N-m (torque-ecomfasteners), 210 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M18: coated with a proprietary lubricant 202 N-m (Fastenal, K 0.13, 75% of proof); lubricated 233 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 311 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 245 N-m (Ecom Fasteners, K 0.158 implied, 75% of proof); lubricated 184 N-m (Ecom Fasteners, K 0.118 implied, 75% of proof); plain and dry 290 N-m (WorkshopCalc, K 0.186 implied, 75% of proof); lubricated 217 N-m (WorkshopCalc, K 0.14 implied, 75% of proof). For lubricated the published charts give 233.0 N-m (torque-fastenal-metric), 184 N-m (torque-ecomfasteners), 217 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 311.0 N-m (torque-fastenal-metric), 245 N-m (torque-ecomfasteners), 290 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M20: coated with a proprietary lubricant 287 N-m (Fastenal, K 0.13, 75% of proof); lubricated 331 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 441 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 350 N-m (Ecom Fasteners, K 0.159 implied, 75% of proof); lubricated 263 N-m (Ecom Fasteners, K 0.119 implied, 75% of proof); plain and dry 410 N-m (WorkshopCalc, K 0.186 implied, 75% of proof); lubricated 307 N-m (WorkshopCalc, K 0.139 implied, 75% of proof). For lubricated the published charts give 331.0 N-m (torque-fastenal-metric), 263 N-m (torque-ecomfasteners), 307 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 441.0 N-m (torque-fastenal-metric), 350 N-m (torque-ecomfasteners), 410 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M22: coated with a proprietary lubricant 390 N-m (Fastenal, K 0.13, 75% of proof); lubricated 450 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 600 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 470 N-m (Ecom Fasteners, K 0.157 implied, 75% of proof); lubricated 353 N-m (Ecom Fasteners, K 0.118 implied, 75% of proof); plain and dry 550 N-m (WorkshopCalc, K 0.183 implied, 75% of proof); lubricated 412 N-m (WorkshopCalc, K 0.137 implied, 75% of proof). For lubricated the published charts give 450.0 N-m (torque-fastenal-metric), 353 N-m (torque-ecomfasteners), 412 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 600.0 N-m (torque-fastenal-metric), 470 N-m (torque-ecomfasteners), 550 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M24: coated with a proprietary lubricant 496 N-m (Fastenal, K 0.13, 75% of proof); lubricated 572 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 762 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 600 N-m (Ecom Fasteners, K 0.157 implied, 75% of proof); lubricated 450 N-m (Ecom Fasteners, K 0.118 implied, 75% of proof); plain and dry 710 N-m (WorkshopCalc, K 0.186 implied, 75% of proof); lubricated 532 N-m (WorkshopCalc, K 0.14 implied, 75% of proof). For lubricated the published charts give 572.0 N-m (torque-fastenal-metric), 450 N-m (torque-ecomfasteners), 532 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 762.0 N-m (torque-fastenal-metric), 600 N-m (torque-ecomfasteners), 710 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M27: coated with a proprietary lubricant 725 N-m (Fastenal, K 0.13, 75% of proof); lubricated 837 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 1115 N-m (Fastenal, K 0.2, 75% of proof).
M30: coated with a proprietary lubricant 985 N-m (Fastenal, K 0.13, 75% of proof); lubricated 1136 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 1515 N-m (Fastenal, K 0.2, 75% of proof).
M33: coated with a proprietary lubricant 1340 N-m (Fastenal, K 0.13, 75% of proof); lubricated 1546 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 2061 N-m (Fastenal, K 0.2, 75% of proof).
M36: coated with a proprietary lubricant 1721 N-m (Fastenal, K 0.13, 75% of proof); lubricated 1985 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 2647 N-m (Fastenal, K 0.2, 75% of proof).
M39: coated with a proprietary lubricant 2227 N-m (Fastenal, K 0.13, 75% of proof); lubricated 2569 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 3426 N-m (Fastenal, K 0.2, 75% of proof).

ISO property class 10.9

ISO property class 10.9 torque estimates by size and lubrication condition.
Size	Series	Clamp load	K = 0.13	K = 0.15	K = 0.17	K = 0.2	Charts
M5	Metric coarse	8.8 kN	5.7 N-m	6.6 N-m	7.5 N-m	8.8 N-m	2
M6	Metric coarse	12.5 kN	9.8 N-m	11.3 N-m	12.8 N-m	15.0 N-m	3
M8	Metric coarse	22.8 kN	23.7 N-m	27.3 N-m	31.0 N-m	36.5 N-m	3
M10	Metric coarse	36.1 kN	46.9 N-m	54.2 N-m	61.4 N-m	72.2 N-m	3
M12	Metric coarse	52.5 kN	81.9 N-m	94.5 N-m	107 N-m	126 N-m	3
M14	Metric coarse	71.6 kN	130 N-m	150 N-m	170 N-m	200 N-m	3
M16	Metric coarse	97.7 kN	203 N-m	235 N-m	266 N-m	313 N-m	3
M18	Metric coarse	119.5 kN	280 N-m	323 N-m	366 N-m	430 N-m	3
M20	Metric coarse	152.5 kN	397 N-m	458 N-m	519 N-m	610 N-m	3
M22	Metric coarse	188.6 kN	539 N-m	622 N-m	705 N-m	830 N-m	3
M24	Metric coarse	219.7 kN	686 N-m	791 N-m	897 N-m	1055 N-m	3
M27	Metric coarse	285.7 kN	1003 N-m	1157 N-m	1311 N-m	1543 N-m	1
M30	Metric coarse	349.2 kN	1362 N-m	1572 N-m	1781 N-m	2095 N-m	1
M33	Metric coarse	432.0 kN	1853 N-m	2138 N-m	2424 N-m	2851 N-m	1
M36	Metric coarse	508.6 kN	2380 N-m	2746 N-m	3113 N-m	3662 N-m	1
M39	Metric coarse	607.6 kN	3080 N-m	3554 N-m	4028 N-m	4739 N-m	1

What the published charts print for ISO property class 10.9

M5: coated with a proprietary lubricant 5.7 N-m (Fastenal, K 0.13, 75% of proof); lubricated 6.6 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 8.8 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 7.2 N-m (Ecom Fasteners, K 0.163 implied, 75% of proof); lubricated 5.4 N-m (Ecom Fasteners, K 0.122 implied, 75% of proof). For lubricated the published charts give 6.6 N-m (torque-fastenal-metric), 5.4 N-m (torque-ecomfasteners). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 8.8 N-m (torque-fastenal-metric), 7.2 N-m (torque-ecomfasteners). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M6: coated with a proprietary lubricant 9.8 N-m (Fastenal, K 0.13, 75% of proof); lubricated 11.3 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 15 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 12 N-m (Ecom Fasteners, K 0.16 implied, 75% of proof); lubricated 9 N-m (Ecom Fasteners, K not stated, 75% of proof); plain and dry 14 N-m (WorkshopCalc, K 0.186 implied, 75% of proof); lubricated 10.5 N-m (WorkshopCalc, K 0.14 implied, 75% of proof). For lubricated the published charts give 11.3 N-m (torque-fastenal-metric), 9 N-m (torque-ecomfasteners), 10.5 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 15.0 N-m (torque-fastenal-metric), 12 N-m (torque-ecomfasteners), 14 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M8: coated with a proprietary lubricant 23.7 N-m (Fastenal, K 0.13, 75% of proof); lubricated 27.3 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 36.5 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 31 N-m (Ecom Fasteners, K 0.17 implied, 75% of proof); lubricated 23 N-m (Ecom Fasteners, K 0.126 implied, 75% of proof); plain and dry 34 N-m (WorkshopCalc, K 0.187 implied, 75% of proof); lubricated 25.5 N-m (WorkshopCalc, K 0.14 implied, 75% of proof). For lubricated the published charts give 27.3 N-m (torque-fastenal-metric), 23 N-m (torque-ecomfasteners), 25.5 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 36.5 N-m (torque-fastenal-metric), 31 N-m (torque-ecomfasteners), 34 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M10: coated with a proprietary lubricant 46.9 N-m (Fastenal, K 0.13, 75% of proof); lubricated 54.2 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 72.2 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 60 N-m (Ecom Fasteners, K 0.166 implied, 75% of proof); lubricated 45 N-m (Ecom Fasteners, K 0.125 implied, 75% of proof); plain and dry 68 N-m (WorkshopCalc, K 0.188 implied, 75% of proof); lubricated 51 N-m (WorkshopCalc, K 0.141 implied, 75% of proof). For lubricated the published charts give 54.2 N-m (torque-fastenal-metric), 45 N-m (torque-ecomfasteners), 51 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 72.2 N-m (torque-fastenal-metric), 60 N-m (torque-ecomfasteners), 68 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M12: coated with a proprietary lubricant 81.9 N-m (Fastenal, K 0.13, 75% of proof); lubricated 94.5 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 126 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 105 N-m (Ecom Fasteners, K 0.167 implied, 75% of proof); lubricated 79 N-m (Ecom Fasteners, K 0.125 implied, 75% of proof); plain and dry 120 N-m (WorkshopCalc, K 0.191 implied, 75% of proof); lubricated 90 N-m (WorkshopCalc, K 0.143 implied, 75% of proof). For lubricated the published charts give 94.5 N-m (torque-fastenal-metric), 79 N-m (torque-ecomfasteners), 90 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 126.0 N-m (torque-fastenal-metric), 105 N-m (torque-ecomfasteners), 120 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M14: coated with a proprietary lubricant 130 N-m (Fastenal, K 0.13, 75% of proof); lubricated 150 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 200 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 170 N-m (Ecom Fasteners, K 0.17 implied, 75% of proof); lubricated 128 N-m (Ecom Fasteners, K 0.128 implied, 75% of proof); plain and dry 190 N-m (WorkshopCalc, K 0.19 implied, 75% of proof); lubricated 142 N-m (WorkshopCalc, K 0.142 implied, 75% of proof). For lubricated the published charts give 150.0 N-m (torque-fastenal-metric), 128 N-m (torque-ecomfasteners), 142 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 200.0 N-m (torque-fastenal-metric), 170 N-m (torque-ecomfasteners), 190 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M16: coated with a proprietary lubricant 203 N-m (Fastenal, K 0.13, 75% of proof); lubricated 235 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 313 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 260 N-m (Ecom Fasteners, K 0.166 implied, 75% of proof); lubricated 195 N-m (Ecom Fasteners, K 0.125 implied, 75% of proof); plain and dry 295 N-m (WorkshopCalc, K 0.189 implied, 75% of proof); lubricated 221 N-m (WorkshopCalc, K 0.141 implied, 75% of proof). For lubricated the published charts give 235.0 N-m (torque-fastenal-metric), 195 N-m (torque-ecomfasteners), 221 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 313.0 N-m (torque-fastenal-metric), 260 N-m (torque-ecomfasteners), 295 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M18: coated with a proprietary lubricant 280 N-m (Fastenal, K 0.13, 75% of proof); lubricated 323 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 430 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 360 N-m (Ecom Fasteners, K 0.167 implied, 75% of proof); lubricated 270 N-m (Ecom Fasteners, K 0.126 implied, 75% of proof); plain and dry 410 N-m (WorkshopCalc, K 0.191 implied, 75% of proof); lubricated 307 N-m (WorkshopCalc, K 0.143 implied, 75% of proof). For lubricated the published charts give 323.0 N-m (torque-fastenal-metric), 270 N-m (torque-ecomfasteners), 307 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 430.0 N-m (torque-fastenal-metric), 360 N-m (torque-ecomfasteners), 410 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M20: coated with a proprietary lubricant 397 N-m (Fastenal, K 0.13, 75% of proof); lubricated 458 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 610 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 510 N-m (Ecom Fasteners, K 0.167 implied, 75% of proof); lubricated 383 N-m (Ecom Fasteners, K 0.126 implied, 75% of proof); plain and dry 580 N-m (WorkshopCalc, K 0.19 implied, 75% of proof); lubricated 435 N-m (WorkshopCalc, K 0.143 implied, 75% of proof). For lubricated the published charts give 458.0 N-m (torque-fastenal-metric), 383 N-m (torque-ecomfasteners), 435 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 610.0 N-m (torque-fastenal-metric), 510 N-m (torque-ecomfasteners), 580 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M22: coated with a proprietary lubricant 539 N-m (Fastenal, K 0.13, 75% of proof); lubricated 622 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 830 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 690 N-m (Ecom Fasteners, K 0.166 implied, 75% of proof); lubricated 518 N-m (Ecom Fasteners, K 0.125 implied, 75% of proof); plain and dry 780 N-m (WorkshopCalc, K 0.188 implied, 75% of proof); lubricated 585 N-m (WorkshopCalc, K 0.141 implied, 75% of proof). For lubricated the published charts give 622.0 N-m (torque-fastenal-metric), 518 N-m (torque-ecomfasteners), 585 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 830.0 N-m (torque-fastenal-metric), 690 N-m (torque-ecomfasteners), 780 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M24: coated with a proprietary lubricant 686 N-m (Fastenal, K 0.13, 75% of proof); lubricated 791 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 1055 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 880 N-m (Ecom Fasteners, K 0.167 implied, 75% of proof); lubricated 660 N-m (Ecom Fasteners, K 0.125 implied, 75% of proof); plain and dry 1000 N-m (WorkshopCalc, K 0.19 implied, 75% of proof); lubricated 750 N-m (WorkshopCalc, K 0.142 implied, 75% of proof). For lubricated the published charts give 791.0 N-m (torque-fastenal-metric), 660 N-m (torque-ecomfasteners), 750 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 1055.0 N-m (torque-fastenal-metric), 880 N-m (torque-ecomfasteners), 1000 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M27: coated with a proprietary lubricant 1003 N-m (Fastenal, K 0.13, 75% of proof); lubricated 1157 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 1543 N-m (Fastenal, K 0.2, 75% of proof).
M30: coated with a proprietary lubricant 1362 N-m (Fastenal, K 0.13, 75% of proof); lubricated 1572 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 2095 N-m (Fastenal, K 0.2, 75% of proof).
M33: coated with a proprietary lubricant 1853 N-m (Fastenal, K 0.13, 75% of proof); lubricated 2138 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 2851 N-m (Fastenal, K 0.2, 75% of proof).
M36: coated with a proprietary lubricant 2380 N-m (Fastenal, K 0.13, 75% of proof); lubricated 2746 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 3662 N-m (Fastenal, K 0.2, 75% of proof).
M39: coated with a proprietary lubricant 3080 N-m (Fastenal, K 0.13, 75% of proof); lubricated 3554 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 4739 N-m (Fastenal, K 0.2, 75% of proof).

ISO property class 12.9

ISO property class 12.9 torque estimates by size and lubrication condition.
Size	Series	Clamp load	K = 0.13	K = 0.15	K = 0.17	K = 0.2	Charts
M5	Metric coarse	10.3 kN	6.7 N-m	7.7 N-m	8.8 N-m	10.3 N-m	2
M6	Metric coarse	14.6 kN	11.4 N-m	13.2 N-m	14.9 N-m	17.6 N-m	3
M8	Metric coarse	26.6 kN	27.7 N-m	31.9 N-m	36.2 N-m	42.6 N-m	3
M10	Metric coarse	42.2 kN	54.9 N-m	63.3 N-m	71.7 N-m	84.4 N-m	3
M12	Metric coarse	61.3 kN	95.7 N-m	110 N-m	125 N-m	147 N-m	3
M14	Metric coarse	83.7 kN	152 N-m	176 N-m	199 N-m	234 N-m	3
M16	Metric coarse	114.2 kN	238 N-m	274 N-m	311 N-m	365 N-m	3
M18	Metric coarse	139.7 kN	327 N-m	377 N-m	427 N-m	503 N-m	3
M20	Metric coarse	178.2 kN	463 N-m	535 N-m	606 N-m	713 N-m	3
M22	Metric coarse	220.4 kN	630 N-m	727 N-m	824 N-m	970 N-m	3
M24	Metric coarse	256.8 kN	801 N-m	925 N-m	1048 N-m	1233 N-m	3
M27	Metric coarse	333.9 kN	1172 N-m	1352 N-m	1533 N-m	1803 N-m	1
M30	Metric coarse	408.1 kN	1592 N-m	1837 N-m	2081 N-m	2449 N-m	1
M33	Metric coarse	504.9 kN	2166 N-m	2499 N-m	2832 N-m	3332 N-m	1
M36	Metric coarse	594.4 kN	2782 N-m	3210 N-m	3638 N-m	4279 N-m	1
M39	Metric coarse	710.0 kN	3600 N-m	4154 N-m	4708 N-m	5538 N-m	1

What the published charts print for ISO property class 12.9

M5: coated with a proprietary lubricant 6.7 N-m (Fastenal, K 0.13, 75% of proof); lubricated 7.7 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 10.3 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 8.6 N-m (Ecom Fasteners, K 0.166 implied, 75% of proof); lubricated 6.5 N-m (Ecom Fasteners, K 0.126 implied, 75% of proof). For lubricated the published charts give 7.7 N-m (torque-fastenal-metric), 6.5 N-m (torque-ecomfasteners). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 10.3 N-m (torque-fastenal-metric), 8.6 N-m (torque-ecomfasteners). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M6: coated with a proprietary lubricant 11.4 N-m (Fastenal, K 0.13, 75% of proof); lubricated 13.2 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 17.5 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 15 N-m (Ecom Fasteners, K 0.171 implied, 75% of proof); lubricated 11 N-m (Ecom Fasteners, K 0.125 implied, 75% of proof); plain and dry 16.5 N-m (WorkshopCalc, K 0.188 implied, 75% of proof); lubricated 12.4 N-m (WorkshopCalc, K 0.141 implied, 75% of proof). For lubricated the published charts give 13.2 N-m (torque-fastenal-metric), 11 N-m (torque-ecomfasteners), 12.4 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 17.5 N-m (torque-fastenal-metric), 15 N-m (torque-ecomfasteners), 16.5 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M8: coated with a proprietary lubricant 27.7 N-m (Fastenal, K 0.13, 75% of proof); lubricated 32 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 42.6 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 37 N-m (Ecom Fasteners, K 0.174 implied, 75% of proof); lubricated 28 N-m (Ecom Fasteners, K 0.131 implied, 75% of proof); plain and dry 40 N-m (WorkshopCalc, K 0.188 implied, 75% of proof); lubricated 30 N-m (WorkshopCalc, K 0.141 implied, 75% of proof). For lubricated the published charts give 32.0 N-m (torque-fastenal-metric), 28 N-m (torque-ecomfasteners), 30 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 42.6 N-m (torque-fastenal-metric), 37 N-m (torque-ecomfasteners), 40 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M10: coated with a proprietary lubricant 54.9 N-m (Fastenal, K 0.13, 75% of proof); lubricated 63.3 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 84.4 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 72 N-m (Ecom Fasteners, K 0.171 implied, 75% of proof); lubricated 54 N-m (Ecom Fasteners, K 0.128 implied, 75% of proof); plain and dry 80 N-m (WorkshopCalc, K 0.19 implied, 75% of proof); lubricated 60 N-m (WorkshopCalc, K 0.142 implied, 75% of proof). For lubricated the published charts give 63.3 N-m (torque-fastenal-metric), 54 N-m (torque-ecomfasteners), 60 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 84.4 N-m (torque-fastenal-metric), 72 N-m (torque-ecomfasteners), 80 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M12: coated with a proprietary lubricant 95.7 N-m (Fastenal, K 0.13, 75% of proof); lubricated 110 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 147 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 125 N-m (Ecom Fasteners, K 0.17 implied, 75% of proof); lubricated 94 N-m (Ecom Fasteners, K 0.128 implied, 75% of proof); plain and dry 140 N-m (WorkshopCalc, K 0.19 implied, 75% of proof); lubricated 105 N-m (WorkshopCalc, K 0.143 implied, 75% of proof). For lubricated the published charts give 110.0 N-m (torque-fastenal-metric), 94 N-m (torque-ecomfasteners), 105 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 147.0 N-m (torque-fastenal-metric), 125 N-m (torque-ecomfasteners), 140 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M14: coated with a proprietary lubricant 152 N-m (Fastenal, K 0.13, 75% of proof); lubricated 176 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 234 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 200 N-m (Ecom Fasteners, K 0.171 implied, 75% of proof); lubricated 150 N-m (Ecom Fasteners, K 0.128 implied, 75% of proof); plain and dry 225 N-m (WorkshopCalc, K 0.192 implied, 75% of proof); lubricated 169 N-m (WorkshopCalc, K 0.144 implied, 75% of proof). For lubricated the published charts give 176.0 N-m (torque-fastenal-metric), 150 N-m (torque-ecomfasteners), 169 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 234.0 N-m (torque-fastenal-metric), 200 N-m (torque-ecomfasteners), 225 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M16: coated with a proprietary lubricant 238 N-m (Fastenal, K 0.13, 75% of proof); lubricated 274 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 365 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 310 N-m (Ecom Fasteners, K 0.17 implied, 75% of proof); lubricated 233 N-m (Ecom Fasteners, K 0.127 implied, 75% of proof); plain and dry 350 N-m (WorkshopCalc, K 0.192 implied, 75% of proof); lubricated 262 N-m (WorkshopCalc, K 0.143 implied, 75% of proof). For lubricated the published charts give 274.0 N-m (torque-fastenal-metric), 233 N-m (torque-ecomfasteners), 262 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 365.0 N-m (torque-fastenal-metric), 310 N-m (torque-ecomfasteners), 350 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M18: coated with a proprietary lubricant 327 N-m (Fastenal, K 0.13, 75% of proof); lubricated 377 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 503 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 430 N-m (Ecom Fasteners, K 0.171 implied, 75% of proof); lubricated 323 N-m (Ecom Fasteners, K 0.128 implied, 75% of proof); plain and dry 485 N-m (WorkshopCalc, K 0.193 implied, 75% of proof); lubricated 364 N-m (WorkshopCalc, K 0.145 implied, 75% of proof). For lubricated the published charts give 377.0 N-m (torque-fastenal-metric), 323 N-m (torque-ecomfasteners), 364 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 503.0 N-m (torque-fastenal-metric), 430 N-m (torque-ecomfasteners), 485 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M20: coated with a proprietary lubricant 463 N-m (Fastenal, K 0.13, 75% of proof); lubricated 535 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 713 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 610 N-m (Ecom Fasteners, K 0.171 implied, 75% of proof); lubricated 458 N-m (Ecom Fasteners, K 0.128 implied, 75% of proof); plain and dry 680 N-m (WorkshopCalc, K 0.191 implied, 75% of proof); lubricated 510 N-m (WorkshopCalc, K 0.143 implied, 75% of proof). For lubricated the published charts give 535.0 N-m (torque-fastenal-metric), 458 N-m (torque-ecomfasteners), 510 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 713.0 N-m (torque-fastenal-metric), 610 N-m (torque-ecomfasteners), 680 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M22: coated with a proprietary lubricant 630 N-m (Fastenal, K 0.13, 75% of proof); lubricated 727 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 970 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 820 N-m (Ecom Fasteners, K 0.169 implied, 75% of proof); lubricated 615 N-m (Ecom Fasteners, K 0.127 implied, 75% of proof); plain and dry 920 N-m (WorkshopCalc, K 0.19 implied, 75% of proof); lubricated 690 N-m (WorkshopCalc, K 0.142 implied, 75% of proof). For lubricated the published charts give 727.0 N-m (torque-fastenal-metric), 615 N-m (torque-ecomfasteners), 690 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 970.0 N-m (torque-fastenal-metric), 820 N-m (torque-ecomfasteners), 920 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M24: coated with a proprietary lubricant 801 N-m (Fastenal, K 0.13, 75% of proof); lubricated 925 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 1233 N-m (Fastenal, K 0.2, 75% of proof); plain and dry 1050 N-m (Ecom Fasteners, K 0.17 implied, 75% of proof); lubricated 788 N-m (Ecom Fasteners, K 0.128 implied, 75% of proof); plain and dry 1180 N-m (WorkshopCalc, K 0.191 implied, 75% of proof); lubricated 885 N-m (WorkshopCalc, K 0.144 implied, 75% of proof). For lubricated the published charts give 925.0 N-m (torque-fastenal-metric), 788 N-m (torque-ecomfasteners), 885 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it. For plain and dry the published charts give 1233.0 N-m (torque-fastenal-metric), 1050 N-m (torque-ecomfasteners), 1180 N-m (torque-workshopcalc). They differ because they assume different nut factors, not because the fastener changes; the K each one states, or the K its own numbers imply, is printed beside it.
M27: coated with a proprietary lubricant 1172 N-m (Fastenal, K 0.13, 75% of proof); lubricated 1352 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 1803 N-m (Fastenal, K 0.2, 75% of proof).
M30: coated with a proprietary lubricant 1592 N-m (Fastenal, K 0.13, 75% of proof); lubricated 1837 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 2449 N-m (Fastenal, K 0.2, 75% of proof).
M33: coated with a proprietary lubricant 2166 N-m (Fastenal, K 0.13, 75% of proof); lubricated 2499 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 3332 N-m (Fastenal, K 0.2, 75% of proof).
M36: coated with a proprietary lubricant 2782 N-m (Fastenal, K 0.13, 75% of proof); lubricated 3210 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 4279 N-m (Fastenal, K 0.2, 75% of proof).
M39: coated with a proprietary lubricant 3600 N-m (Fastenal, K 0.13, 75% of proof); lubricated 4154 N-m (Fastenal, K 0.15, 75% of proof); plain and dry 5538 N-m (Fastenal, K 0.2, 75% of proof).

Sizes named but not built

Inch rows cover SAE Grade 2, Grade 5 and Grade 8 in the UNC and UNF sizes SAE J429 Table 5 tabulates. Metric rows cover ISO property classes 4.6, 8.8, 10.9 and 12.9 in metric coarse from M5 to M39. ASTM A307 has no published proof load, so no torque row is built for it: one chart estimates its clamp load from 36,000 psi, and that is that chart's assumption rather than a published figure.

19 further grade-and-size combinations have a published proof load in the standard but no published torque in any of the charts cross-checked here, so they have no row in the chart above:

Grade and size combinations with a published proof load but no published torque.
Grade	Size	Series	Proof load
SAE Grade 2	1-1/2-12	UNF	52,200 lbf
SAE Grade 2	1-1/2-6	UNC	46,400 lbf
SAE Grade 2	1-1/4-12	UNF	35,400 lbf
SAE Grade 2	1-1/4-7	UNC	32,000 lbf
SAE Grade 2	1-1/8-12	UNF	28,200 lbf
SAE Grade 5	1-1/8-12	UNF	63,300 lbf
SAE Grade 8	1-1/8-12	UNF	102,700 lbf
SAE Grade 2	1-1/8-7	UNC	25,200 lbf
SAE Grade 5	1-1/8-7	UNC	56,500 lbf
SAE Grade 8	1-1/8-7	UNC	91,600 lbf
SAE Grade 2	1-3/8-12	UNF	43,400 lbf
SAE Grade 5	1-3/8-12	UNF	97,300 lbf
SAE Grade 8	1-3/8-12	UNF	157,800 lbf
SAE Grade 2	1-3/8-6	UNC	38,100 lbf
SAE Grade 5	1-3/8-6	UNC	85,500 lbf
SAE Grade 8	1-3/8-6	UNC	138,600 lbf
SAE Grade 2	9/16-18	UNF	11,200 lbf
SAE Grade 5	9/16-18	UNF	17,300 lbf
SAE Grade 8	9/16-18	UNF	24,400 lbf

Where these figures come from

Dimensions are as defined by SAE J429 and ISO 898-1. This site is an independent reference and is not affiliated with, endorsed by or approved by any standards body.

Proof loads come from the grade standards and the printed torque figures from these charts; the Charts column counts how many printed a figure for that row:

SAE J429 Revised JAN1999, Table 5 (proof load and tensile strength requirements) - SAE International (copy hosted by Finesz), Revised JAN1999 (read 2026-08-27)
Torque-tension relationship for A307A, Grade 5, 8 and 9 bolts - Fastenal, Rev 3-6-09 (read 2026-08-27)
Torque-tension relationship, ISO 898-1 property class 4.6, 8.8, 10.9 and 12.9, metric coarse thread - Fastenal, Jan 2016 (read 2026-08-27)
Torque vs tension bolts table chart, SAE J429 bolts - Engineers Edge, edition not stated (read 2026-08-27)
Bolt torque chart: SAE and metric specs by grade - WorkshopCalc, edition not stated (read 2026-08-27)
Torque chart for class 8.8, 10.9 and 12.9 metric fasteners - Ecom Fasteners, edition not stated (read 2026-08-27)
EN ISO 898-1 (2013) Table 3, stress under proof load by property class - Sidex s.r.l., EN ISO 898-1:2013 (read 2026-08-27)
ISO 898 Part 1 - 2013 (extract), Table 3 - Kova Fasteners, ISO 898-1:2013 (read 2026-08-27)
Mechanical properties, screws and studs, EN ISO 898-1:2013 - Nordic Fastening Group, EN ISO 898-1:2013 (read 2026-08-27)

The nut factor for a zinc-plated, dry fastener: K = 0.17 (torque-fastenal-inch) against K = 0.18 (torque-engineersedge). Both are printed. K is an empirical lumped friction term, not a property of the coating, and a six percent spread between two careful charts is a fair picture of how well it is known. The estimate columns use 0.17 and show the range.

The nut factor two of the charts never state: states K for every column (torque-fastenal-inch) against states no K (torque-workshopcalc) against states no K (torque-ecomfasteners). Where a chart prints a torque without saying what nut factor produced it, the K its own numbers imply is computed from its published clamp load and printed beside the figure. That is arithmetic on what the chart published, and it is labelled as implied rather than stated.

Proof load: the standard's table against the charts' arithmetic: 1/2-13 Grade 5 proof load 12,100 lb (j429-1999) against clamp load 9,046 lb, which is 75 percent of 12,061 lb (torque-fastenal-inch). SAE J429 Table 5 rounds its proof loads; the torque charts multiply the stress area by the proof stress and keep the unrounded product. The gap is about a third of a percent. The proof load printed on these pages is the published one from the standard, and the published torque columns are left exactly as their charts printed them rather than rescaled to match.