18, Zinc plated steel, 2-1/2"

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 have a flange on the bottom of the head that distributes the load like a washer.

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.

Construction screws intended for fastening drywall sheets to studs.

Bolts or screws with a circular ring on the head.

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