Metric fine
Tap drill 11 mm for a M12 × 1.0 thread — major Ø 12 mm, pitch 1 mm (25.4 TPI).
Profile
| Designation | M12 × 1.0 |
|---|---|
| Major (outside) diameter | 12 mm · 0.4724" |
| Pitch | 1 mm · 25.4 TPI |
| Pitch diameter | 11.351 mm · 0.4469" |
| Minor diameter (external) | 10.773 mm · 0.4241" |
| Minor diameter (internal) | 10.918 mm · 0.4298" |
| Recommended tap drill | 11 mm · ≈77% thread |
| Clearance hole | Close 13 · Normal 13.5 · Loose 14.5 mm |
| Hex head (across flats) | 18 mm |
| Socket key (across flats) | 10 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 | 96.1 mm² | 41.81 kN | 100.3 N·m |
| Class 10.9 | 96.1 mm² | 59.82 kN | 143.6 N·m |
| Class 12.9 | 96.1 mm² | 69.92 kN | 167.8 N·m |
For a M12 × 1.0 thread, drill the hole with a 11 mm tap drill (11 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 12 mm and a pitch of 1 mm (25.4 TPI).
To pass a M12 × 1.0 bolt through a part rather than thread it, use a clearance hole: Close 13 · Normal 13.5 · Loose 14.5 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