1/2", Zinc, 20

US Fasteners, 1/2", Zinc, 20
Sheet metal screws Screws with large threads for use in sheet metal sometimes also used in plastic, fiberglass or wood.	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 have a flange on the bottom of the head that distributes the load like a washer.	Machine screws Screws with machine threads for use with a nut or in a tapped hole.
Carriage bolts & Plow bolts Bolts with no drive and machine threads for use with a nut.	Socket screws Screws with an Allen wrench drive.
Sex bolts & Mating screws 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.	Thumb screws Provides a grip for where hand loosening or tightening is needed. Commonly used in applications such as access panels and where frequent adjustment is required.