Metric fine
Tap drill 42 mm for a M45 × 3.0 thread — major Ø 45 mm, pitch 3 mm (8.47 TPI).
Profile
| Designation | M45 × 3.0 |
|---|---|
| Major (outside) diameter | 45 mm · 1.7717" |
| Pitch | 3 mm · 8.47 TPI |
| Pitch diameter | 43.052 mm · 1.6949" |
| Minor diameter (external) | 41.319 mm · 1.6267" |
| Minor diameter (internal) | 41.753 mm · 1.6438" |
| Recommended tap drill | 42 mm · ≈77% thread |
| Clearance hole | Close 46 · Normal 48 · Loose 51 mm |
| Hex head (across flats) | 70 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 | 1397.7 mm² | 608 kN | 5472 N·m |
| Class 10.9 | 1397.7 mm² | 870.07 kN | 7830.6 N·m |
| Class 12.9 | 1397.7 mm² | 1016.83 kN | 9151.4 N·m |
For a M45 × 3.0 thread, drill the hole with a 42 mm tap drill (42 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 45 mm and a pitch of 3 mm (8.47 TPI).
To pass a M45 × 3.0 bolt through a part rather than thread it, use a clearance hole: Close 46 · Normal 48 · Loose 51 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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