Metric coarse
Tap drill 32 mm for a M36 × 4.0 thread — major Ø 36 mm, pitch 4 mm (6.35 TPI).
Profile
| Designation | M36 × 4.0 |
|---|---|
| Major (outside) diameter | 36 mm · 1.4173" |
| Pitch | 4 mm · 6.35 TPI |
| Pitch diameter | 33.402 mm · 1.315" |
| Minor diameter (external) | 31.093 mm · 1.2241" |
| Minor diameter (internal) | 31.67 mm · 1.2469" |
| Recommended tap drill | 32 mm · ≈77% thread |
| Clearance hole | Close 37 · Normal 39 · Loose 42 mm |
| Hex head (across flats) | 55 mm |
| Socket key (across flats) | 27 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 | 816.7 mm² | 355.27 kN | 2558 N·m |
| Class 10.9 | 816.7 mm² | 508.41 kN | 3660.5 N·m |
| Class 12.9 | 816.7 mm² | 594.16 kN | 4278 N·m |
For a M36 × 4.0 thread, drill the hole with a 32 mm tap drill (32 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 36 mm and a pitch of 4 mm (6.35 TPI).
To pass a M36 × 4.0 bolt through a part rather than thread it, use a clearance hole: Close 37 · Normal 39 · Loose 42 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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