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

US Fasteners

Sheet metal screw

Sheet metal screws

Screws with large threads for use in sheet metal sometimes also used in plastic, fiberglass or wood.
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.
Lag bolt

Lag bolts

Large wood screws technically called lag screws.
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.
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.
Cotter pin

Pins & Clips

Pins and clips are used to secure or align fasteners or parts on machinery.