Metric Size
M4
M4 coarse thread — 0.7 mm pitch, 3.3 mm tap drill, 4.5 mm normal clearance hole, 3 mm hex key.
Last verified: 2026-07-10
| Pitch(mm)Coarse-thread pitch (ISO 261). | 0.7 |
|---|---|
| Tap drill(mm)For ~75% thread — major Ø minus pitch. | 3.3 |
| Clearance (normal)(mm)Normal clearance hole (ISO 273). | 4.5 |
| Hex key(mm)Socket cap-screw hex key (ISO 4762). | 3 |
| Typical use | General assembly, brackets, covers |
Other metric fastener reference
Sources
- ISO 261 — ISO general-purpose metric screw threads (coarse pitch)
- ISO 273 — clearance holes for bolts and screws (normal fit)
- ISO 4762 — hexagon socket head cap screws (hex key sizes)