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5/16", Chrome

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.
Carriage bolt

Carriage bolts & Plow bolts

Bolts with no drive, and machine threads for use with a nut.
Socket product

Socket screws

Screws with an Allen wrench drive.
Nut

Nuts

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