Metric fine
Tap drill 9 mm for a M10 × 1.0 thread — major Ø 10 mm, pitch 1 mm (25.4 TPI).
Profile
| Designation | M10 × 1.0 |
|---|---|
| Major (outside) diameter | 10 mm · 0.3937" |
| Pitch | 1 mm · 25.4 TPI |
| Pitch diameter | 9.351 mm · 0.3681" |
| Minor diameter (external) | 8.773 mm · 0.3454" |
| Minor diameter (internal) | 8.918 mm · 0.3511" |
| Recommended tap drill | 9 mm · ≈77% thread |
| Clearance hole | Close 10.5 · Normal 11 · Loose 12 mm |
| Hex head (across flats) | 16 mm |
| Socket key (across flats) | 8 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 | 64.5 mm² | 28.05 kN | 56.1 N·m |
| Class 10.9 | 64.5 mm² | 40.15 kN | 80.3 N·m |
| Class 12.9 | 64.5 mm² | 46.92 kN | 93.8 N·m |
For a M10 × 1.0 thread, drill the hole with a 9 mm tap drill (9 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 10 mm and a pitch of 1 mm (25.4 TPI).
To pass a M10 × 1.0 bolt through a part rather than thread it, use a clearance hole: Close 10.5 · Normal 11 · Loose 12 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