Cap Head Screw to Tool Cross-Reference

Table 1. American Standard Metric Hex/Socket Head Cap Screws to Tool Cross Reference
Socket Head Cap and Thread Pitch	Hex Key Size Nominal	Hex Head Cap and Thread Pitch	Socket Wrench Size Nominal
M1.6 x 0.35	1.5mm	N/A	N/A
M2 x 0.4	1.5mm	N/A	N/A
M2.5 x 0.45	2.0mm	N/A	N/A
M3 x 0.5	2.5mm	N/A	N/A
M4 x 0.7	3.0mm	N/A	N/A
M5 x 0.8	4.0mm	M5 x 0.8	8.0mm
M6 x 1.0	5.0mm	M6 x 1.0	10.0mm
M8 x 1.25	6.0mm	M8 x 1.25	13.0mm
M10 x 1.5	8.0mm	M10 x 1.5	16.0mm
M12 x 1.75	10.0mm	M12 x 1.75	18.0mm
M14 x 2.0	12.0mm	M14 x 2.0	21.0mm
M16 x 2.0	14.0mm	M16 x 2.0	24.0mm
M20 x 2.5	17.0mm	M20 x 2.5	30.0mm
M24 x 3.0	19.0mm	M24 x 3.0	36.0mm
M30 x 3.5	22.0mm	M30 x 3.5	46.0mm
M36 x 4.0	27.0mm	M36 x 4.0	55.0mm
M42 x 4.5	32.0mm	M42 x 4.5	65.0mm
M48 x 5.0	36.0mm	M48 x 5.0	75.0mm