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Old 08-26-2014, 05:04 PM
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Are M sized sockets the same as MM metric sockets?

Hi all. I am looking at the cam sprocket on my om603 engine. It is a 12 point bolt. The FSM says it is an M11 sized 12 point. I went to my tool box, pulled out my metric 12 point sockets send found that only a 13mm socket fits, though it is a little bit loose. So, are they different, M vs mm?

Trying to decide if I need another set of M sized sockets of if my mm ones are ok.

Thanks!

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Old 08-26-2014, 05:15 PM
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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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