Metric fine
Tap drill 33 mm for a M36 × 3.0 thread — major Ø 36 mm, pitch 3 mm (8.47 TPI).
Profile
| Designation | M36 × 3.0 |
|---|---|
| Major (outside) diameter | 36 mm · 1.4173" |
| Pitch | 3 mm · 8.47 TPI |
| Pitch diameter | 34.052 mm · 1.3406" |
| Minor diameter (external) | 32.319 mm · 1.2724" |
| Minor diameter (internal) | 32.752 mm · 1.2895" |
| Recommended tap drill | 33 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 | 864.9 mm² | 376.25 kN | 2709 N·m |
| Class 10.9 | 864.9 mm² | 538.42 kN | 3876.6 N·m |
| Class 12.9 | 864.9 mm² | 629.24 kN | 4530.5 N·m |
For a M36 × 3.0 thread, drill the hole with a 33 mm tap drill (33 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 3 mm (8.47 TPI).
To pass a M36 × 3.0 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.
Same diameter
Nearby sizes