Metric fine
Tap drill 56 mm for a M60 × 4.0 thread — major Ø 60 mm, pitch 4 mm (6.35 TPI).
Profile
| Designation | M60 × 4.0 |
|---|---|
| Major (outside) diameter | 60 mm · 2.3622" |
| Pitch | 4 mm · 6.35 TPI |
| Pitch diameter | 57.402 mm · 2.2599" |
| Minor diameter (external) | 55.093 mm · 2.169" |
| Minor diameter (internal) | 55.67 mm · 2.1917" |
| Recommended tap drill | 56 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 | 2484.8 mm² | 1080.89 kN | 12970.7 N·m |
| Class 10.9 | 2484.8 mm² | 1546.79 kN | 18561.5 N·m |
| Class 12.9 | 2484.8 mm² | 1807.69 kN | 21692.3 N·m |
For a M60 × 4.0 thread, drill the hole with a 56 mm tap drill (56 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 4 mm (6.35 TPI).
To pass a M60 × 4.0 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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