Metric fine
Tap drill 5.25 mm for a M6 × 0.75 thread — major Ø 6 mm, pitch 0.75 mm (33.87 TPI).
Profile
| Designation | M6 × 0.75 |
|---|---|
| Major (outside) diameter | 6 mm · 0.2362" |
| Pitch | 0.75 mm · 33.87 TPI |
| Pitch diameter | 5.513 mm · 0.217" |
| Minor diameter (external) | 5.08 mm · 0.2" |
| Minor diameter (internal) | 5.188 mm · 0.2043" |
| Recommended tap drill | 5.25 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 | 22 mm² | 9.58 kN | 11.5 N·m |
| Class 10.9 | 22 mm² | 13.71 kN | 16.5 N·m |
| Class 12.9 | 22 mm² | 16.03 kN | 19.2 N·m |
For a M6 × 0.75 thread, drill the hole with a 5.25 mm tap drill (5.25 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 0.75 mm (33.87 TPI).
To pass a M6 × 0.75 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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