Metric Allen Drive Screw Size

Screw DiameterDrive Size
–Socket flat head screwSocket button head screwSocket cap screwSocket set screw
–Socket FlatSocket ButtonSocket CapSet Screw
1.6mm1.5mm0.7mm
2mm1.5mm0.9mm
2.5mm2mm1.3mm
3mm2mm2mm2.5mm1.5mm
4mm2.5mm2.5mm3mm2mm
5mm3mm3mm4mm2.5mm
6mm4mm4mm5mm3mm
8mm5mm5mm6mm4mm
10mm6mm6mm8mm5mm
12mm8mm8mm10mm6mm
14mm10mm*12mm
16mm10mm10mm14mm
* This product is not manufactured, or does not have a standardized drive size.