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5/16"-18 x 4-1/2", US, Grade 8 steel, External hex

US Fasteners, 5/16"-18 x 4-1/2", Grade 8 steel, 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.