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5/16"-18 x 1/2", Zinc, External hex

US Fasteners

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.
Flange bolts

Flange bolts

Flange bolts have a flange on the bottom of the head that distributes the load like a washer.
Machine screws hex washer head

Machine screws

Screws with machine threads for use with a nut or in a tapped hole.