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Hex head, Zinc plated grade 5 steel, 5/8"-18 x 4"

US Fasteners, Hex head, Zinc plated grade 5 steel, 5/8"-18 x 4"

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.