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A 3/8" BOLT is made from 3/8" rod so if you mike the threaded portion it may be a few thou
short of the actual size, like 0.371" or so.
Those who call bolts by their head size are setting themselves up for confusion and also
obviously never made any bolts.
For example the fine thread bolts that hold your driveshaft together usually have
smaller than normal heads.
BTW do yourself a favor and separate your metric bolts from the inch-size (unified) ones.
LOTS of confusion there, especially between the 5/16" and M12 sizes.
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