Metric coarse
Tap drill 5 mm for a M6 × 1.0 thread — major Ø 6 mm, pitch 1 mm (25.4 TPI).
Profile
| Designation | M6 × 1.0 |
|---|---|
| Major (outside) diameter | 6 mm · 0.2362" |
| Pitch | 1 mm · 25.4 TPI |
| Pitch diameter | 5.351 mm · 0.2106" |
| Minor diameter (external) | 4.773 mm · 0.1879" |
| Minor diameter (internal) | 4.918 mm · 0.1936" |
| Recommended tap drill | 5 mm · ≈77% thread |
| Clearance hole | Close 6.4 · Normal 6.6 · Loose 7 mm |
| Hex head (across flats) | 10 mm |
| Socket key (across flats) | 5 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 | 20.1 mm² | 8.75 kN | 10.5 N·m |
| Class 10.9 | 20.1 mm² | 12.53 kN | 15 N·m |
| Class 12.9 | 20.1 mm² | 14.64 kN | 17.6 N·m |
For a M6 × 1.0 thread, drill the hole with a 5 mm tap drill (5 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 6 mm and a pitch of 1 mm (25.4 TPI).
To pass a M6 × 1.0 bolt through a part rather than thread it, use a clearance hole: Close 6.4 · Normal 6.6 · Loose 7 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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