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US, 1/2"-20, Zinc plated grade 8 steel

US Fasteners, 1/2"-20, 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.

Nut

Nuts

Nuts have internal machine threads, for use with machine thread bolts and screws.