Metric coarse
Tap drill 54.5 mm for a M60 × 5.5 thread — major Ø 60 mm, pitch 5.5 mm (4.62 TPI).
Profile
| Designation | M60 × 5.5 |
|---|---|
| Major (outside) diameter | 60 mm · 2.3622" |
| Pitch | 5.5 mm · 4.62 TPI |
| Pitch diameter | 56.428 mm · 2.2216" |
| Minor diameter (external) | 53.252 mm · 2.0965" |
| Minor diameter (internal) | 54.046 mm · 2.1278" |
| Recommended tap drill | 54.5 mm · ≈77% thread |
| Clearance hole | Close 62 · Normal 66 · Loose 70 mm |
| Hex head (across flats) | 90 mm |
ISO 273 clearance holes (fine / medium / coarse).
Target preload is 75% of proof load; torque is estimated from T = K · F · d.
| Grade / class | Stress area | Preload | Torque |
|---|---|---|---|
| Class 8.8 | 2362 mm² | 1027.48 kN | 12329.7 N·m |
| Class 10.9 | 2362 mm² | 1470.36 kN | 17644.3 N·m |
| Class 12.9 | 2362 mm² | 1718.37 kN | 20620.4 N·m |
For a M60 × 5.5 thread, drill the hole with a 54.5 mm tap drill (54.5 mm — the standard D − P rule) before tapping. That produces roughly 77% thread engagement, the usual target for a strong, tappable hole. The mating bolt has a major diameter of 60 mm and a pitch of 5.5 mm (4.62 TPI).
To pass a M60 × 5.5 bolt through a part rather than thread it, use a clearance hole: Close 62 · Normal 66 · Loose 70 mm.
All values are generated from the standard thread formulas (ISO 68-1 / ASME B1.1) and published standard tables — not hand-entered. See the full reference.
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