Metric coarse
Tap drill 3.3 mm for a M4 × 0.7 thread — major Ø 4 mm, pitch 0.7 mm (36.29 TPI).
Profile
| Designation | M4 × 0.7 |
|---|---|
| Major (outside) diameter | 4 mm · 0.1575" |
| Pitch | 0.7 mm · 36.29 TPI |
| Pitch diameter | 3.545 mm · 0.1396" |
| Minor diameter (external) | 3.141 mm · 0.1237" |
| Minor diameter (internal) | 3.242 mm · 0.1276" |
| Recommended tap drill | 3.3 mm · ≈77% thread |
| Clearance hole | Close 4.3 · Normal 4.5 · Loose 4.8 mm |
| Hex head (across flats) | 7 mm |
| Socket key (across flats) | 3 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 | 8.8 mm² | 3.82 kN | 3.05 N·m |
| Class 10.9 | 8.8 mm² | 5.46 kN | 4.37 N·m |
| Class 12.9 | 8.8 mm² | 6.39 kN | 5.11 N·m |
For a M4 × 0.7 thread, drill the hole with a 3.3 mm tap drill (3.3 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 4 mm and a pitch of 0.7 mm (36.29 TPI).
To pass a M4 × 0.7 bolt through a part rather than thread it, use a clearance hole: Close 4.3 · Normal 4.5 · Loose 4.8 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.
Nearby sizes