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5/8"-18 x 5-1/2", Zinc plated grade 5, US, External hex

US Fasteners, 5/8"-18 x 5-1/2", Zinc plated grade 5, External hex

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.