Metric coarse
Tap drill 2.9 mm for a M3.5 × 0.6 thread — major Ø 3.5 mm, pitch 0.6 mm (42.33 TPI).
Profile
| Designation | M3.5 × 0.6 |
|---|---|
| Major (outside) diameter | 3.5 mm · 0.1378" |
| Pitch | 0.6 mm · 42.33 TPI |
| Pitch diameter | 3.11 mm · 0.1225" |
| Minor diameter (external) | 2.764 mm · 0.1088" |
| Minor diameter (internal) | 2.851 mm · 0.1122" |
| Recommended tap drill | 2.9 mm · ≈77% thread |
| Clearance hole | Close 3.7 · Normal 3.9 · Loose 4.2 mm |
| Hex head (across flats) | 6 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 | 6.8 mm² | 2.95 kN | 2.06 N·m |
| Class 10.9 | 6.8 mm² | 4.22 kN | 2.95 N·m |
| Class 12.9 | 6.8 mm² | 4.93 kN | 3.45 N·m |
For a M3.5 × 0.6 thread, drill the hole with a 2.9 mm tap drill (2.9 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 3.5 mm and a pitch of 0.6 mm (42.33 TPI).
To pass a M3.5 × 0.6 bolt through a part rather than thread it, use a clearance hole: Close 3.7 · Normal 3.9 · Loose 4.2 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