Metric fine
Tap drill 6.25 mm for a M7 × 0.75 thread — major Ø 7 mm, pitch 0.75 mm (33.87 TPI).
Profile
| Designation | M7 × 0.75 |
|---|---|
| Major (outside) diameter | 7 mm · 0.2756" |
| Pitch | 0.75 mm · 33.87 TPI |
| Pitch diameter | 6.513 mm · 0.2564" |
| Minor diameter (external) | 6.08 mm · 0.2394" |
| Minor diameter (internal) | 6.188 mm · 0.2436" |
| Recommended tap drill | 6.25 mm · ≈77% thread |
| Clearance hole | Close 7.4 · Normal 7.6 · Loose 8 mm |
| Hex head (across flats) | 11 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 | 31.1 mm² | 13.54 kN | 19 N·m |
| Class 10.9 | 31.1 mm² | 19.38 kN | 27.1 N·m |
| Class 12.9 | 31.1 mm² | 22.65 kN | 31.7 N·m |
For a M7 × 0.75 thread, drill the hole with a 6.25 mm tap drill (6.25 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 7 mm and a pitch of 0.75 mm (33.87 TPI).
To pass a M7 × 0.75 bolt through a part rather than thread it, use a clearance hole: Close 7.4 · Normal 7.6 · Loose 8 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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