there isn't a set amount for metrics just as there is no set amount
for SAE fasteners take a 1/2" bolt for example... the common head size
is 3/4", however, an ASTM A325 (heavy hex grade 5) 1/2" bolt has a
7/8" head. there are also tight clearance 1/2" bolts that have a 12pt
I've got 10 MM 9.8 fasteners with heads from 14-17 mm in size...
depending on where I got them from.
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