Quote:
Originally Posted by GH85Carrera
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"Wow - I learned something new already Monday morning. I always thought the "M" numbers referred to the diameter of the screw/bolt along with thread pitch. Now I know better..."
It
is the diameter of the bolt, and is usually accompanied by a number indication the thread pitch. The 13mm across from the M8 is the common distance across the flats of the hex. If you work on 50s German cars you know it can be 12, 13, or 14 mm. There are 8 mm brass nuts for VW and BMW exhaust studs that are 11mm ATF.