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Hex head, 9/16"-18 x 5-1/2", Zinc plated grade 8 steel

US Fasteners, Hex head, 9/16"-18 x 5-1/2", Zinc plated grade 8 steel

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.