Metric Wrench Sizes Hexagon Socket

The wrench sizes of hexagon socket screws have different wrench sizes due to the different screw heads (e.g. cylinder head, countersunk head, lens head,...) with the same thread size. Special care must be taken with screw dimensions below M3. Here it comes frequently to mix-ups and thus to the use of too small hexagon socket wrenches which can easily lead to damage of the hexagon socket.

The wrench size for metric hexagon socket screws is given as a dimension (s) in technical drawings and in mm (millimetres).

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Metric Wrench Sizes Hexagon Socket Chart

	Wrench sizes in (mm)
Metric threads	DIN 912 (Socket head)	DIN 6912 (Socket head)	DIN 7984 (Socket head)	DIN 7991 (Flat head)	ISO 7380 (Button head)
M1,4	1,3 mm
M1,6	1,5 mm
M2	1,5 mm
M2,5	2,0 mm			1,5 mm	1,5 mm
M3	2,5 mm		2,0 mm	2,0 mm	2,0 mm
M4	3,0 mm	3,0 mm	2,5 mm	2,5 mm	2,5 mm
M5	4 mm	4 mm	3 mm	3 mm	3 mm
M6	5 mm	5 mm	4 mm	4 mm	4 mm
M8	6 mm	6 mm	5 mm	5 mm	5 mm
M10	8 mm	8 mm	6 mm	6 mm	6 mm
M12	10 mm	10 mm	8 mm	8 mm	8 mm
M14	12 mm	12 mm	10 mm	10 mm	10 mm
M16	14 mm	14 mm	12 mm	10 mm	10 mm

* All data without guarantee.

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