5/16"

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.
Machine screw

Machine screws

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

Socket screws

Screws with an allen wrench drive.
Set screw

Set screws

Screws with no head and machine threads for use in a tapped hole.
Eye bolts

Eye bolts & Screw eyes

Bolts or screws with a circular ring on the head.
Spacer

Spacers

Unthreaded sleeves that fit over bolts or screws to maintain space between components.
Shoulder bolt

Shoulder bolts

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

Cotter pins

Cotter or split pins have two tines which are bent apart to hold them in place.