Metal bolt for connecting objects has heads on both ends, one of which is polygonal, and both of which are produced by cold forging

摘要

The metal bolt has heads on both ends. One of these is not circular, but polygonal. The heads are made on the bolt by cold forging. The two heads may be identical in shape. The heads may both be aligned the same way relative to the longitudinal central axis of the bolt. A flange may be made on the bolt between the heads, also by cold forging.