To tap an M5 thread (pitch 0.8 mm), drill a 4.2 mm hole for standard 6H tolerance. Use 4.3 mm for a looser 7H fit. M5 taps are common in furniture fittings, panel mounts and light brackets.

Tolerance classDrill diameterPitchThread depth
6H (standard)4.2 mm0.8 mm6–10 mm
7H (loose)4.3 mm0.8 mm6–10 mm
4H (tight)4.1 mm0.8 mm6–10 mm

Fine pitch M5×0.5 variant available in Handbook Locksmith app.

FAQ

4.2 mm for standard M5 thread (6H, pitch 0.8 mm).
Full M5 thread data in the app
Profile viewer, tolerance calculator, 28 thread types
GET IT ONGoogle Play★ 4.7 (800+) · 100K+ · Thread Reference
GET IT ONGoogle Play★ 4.7 (800+) · 100K+ · Thread Reference