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External hex, 9/16" x 5-1/2", Zinc plated grade 8, US

US Fasteners, External hex, 9/16" x 5-1/2", Zinc plated grade 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.