24, US, Steel, 1-1/4"

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

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.

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

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

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

Bolts or screws with a circular ring on the head.

Sex bolts resemble machine screws, but with internal threads, and can be used with either specialized mating screws or standard machine screws. Also known as barrel nuts and Chicago bolts.