5/16"-18 x 1-3/4", Steel, US

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 screw

Machine screws

Screws with machine threads for use with a nut or in a tapped hole.
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.
Hanger bolts & Dowel screws

Hanger bolts & Dowel screws

Hanger bolts and dowel screws are used for adding an external machine or screw thread to wood applications.
Eye bolts

Eye bolts & Screw eyes

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

Elevator bolts

Bolts with a very large flat head and machine threads for use with a nut.