screw with a hex head that was thicker than a bolt head, but the distance across the flats was less than a bolt's. ... A socket cap screw, also known as a socket head capscrew, socket screw, or Allen bolt, is a type of cap screw with a cylindrical head and hexagonal drive hole.
Flange bolts have a circular flange under the head that acts like a washer to distribute the load. Flange bolts that are non-serrated are sometimes called framebolts.
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