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16, 4-1/4"

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.
Socket product

Socket screws

Screws with an allen wrench drive.
Eye bolts

Eye bolts & Screw eyes

Bolts or screws with a circular ring on the head.
Shoulder bolt

Shoulder bolts

Screws with an unthreaded shoulder that is larger in diameter than the threads. Also known as stripper bolts.