Ian Glen

Screw Heads

Common machine screw sizes.

Metric

Screw SizeClearance HoleTap Drill
mminmmin
M2-0.42.23/321.6
M2.5-0.452.77/642.0
M3-0.53.21/82.5
M4-0.74.311/643.3
M5-0.85.37/324.2
M6-1.06.417/645.0