Thread: Are M sized sockets the same as MM metric sockets?
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Old 08-26-2014, 05:15 PM
Zulfiqar Zulfiqar is offline
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the 13mm is the head hex size, the M11 is the shank thread diameter.

a regular 10 mm hex head bolt is in real terms referred to as an M6 screw (further defined with the thread pitch).
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