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1/2" x 5/8", 18-8

US Fasteners, 1/2" x 5/8", 18-8

Hex bolt

Hex bolts

Bolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. Also known as hex cap screws or machine bolts.

Set screw

Set screws

Screws with no head and machine threads for use in a tapped hole.