Sex bolt

The bolt (mated pair, screw and post) sits within the components being fastened, and the flange provides the bearing surface.

The sex bolt often has a built-in feature, such as a slot, to aid in tightening the fastener.

Other names for sex bolts, or (in some cases) for the female half specifically, include:

Applications vary widely from book binding to installing bathroom partitions.

This group of fasteners are used to assemble fitness apparatus, solar panels, playground equipment, railing systems, furniture, athletic helmets, knives, store fixtures, signs, panic bars, and many other products.