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US, 5/16" x 1/2", Zinc plated steel, External hex

US Fasteners, 5/16" x 1/2", Zinc plated 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.

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.