M8 Tapped Hole Drill Size — 6.8 mm

To tap an M8 thread (pitch 1.25 mm), drill a 6.8 mm hole for standard 6H tolerance. Use 7.0 mm for a looser 7H fit.

Tolerance class	Drill diameter	Pitch	Thread depth
6H (standard)	6.8 mm	1.25 mm	10–14 mm
7H (loose)	7.0 mm	1.25 mm	10–14 mm
4H (tight)	6.6 mm	1.25 mm	10–14 mm

Fine pitch M8×1.0 variant available in Handbook Locksmith app.

FAQ

6.8 mm for standard M8 thread (6H, pitch 1.25 mm).

Свердло 6,8 мм для різьби М8 з кроком 1,25 мм (допуск 6H).

Сверло 6,8 мм для резьбы М8 с шагом 1,25 мм (допуск 6H).

Full M8 thread data in the app
Profile viewer, tolerance calculator, 28 thread types