M4 Tapped Hole Drill Size — 3.3 mm

To tap an M4 thread (pitch 0.7 mm), drill a 3.3 mm hole for standard 6H tolerance. Use 3.4 mm for a looser 7H fit.

Tolerance class	Drill diameter	Pitch	Thread depth
6H (standard)	3.3 mm	0.7 mm	5–8 mm
7H (loose)	3.4 mm	0.7 mm	5–8 mm
4H (tight)	3.2 mm	0.7 mm	5–8 mm

Fine pitch M4×0.5 variant available in Handbook Locksmith app.

FAQ

3.3 mm drill for standard M4 thread (6H, pitch 0.7 mm).

Свердло 3,3 мм для різьби М4 з кроком 0,7 мм (допуск 6H).

Сверло 3,3 мм под резьбу М4 с шагом 0,7 мм (допуск 6H).

Full M4 thread data in the app
Profile viewer, tolerance calculator, 28 thread types