Truss

US Fasteners

Sheet metal screw phillips truss head

Sheet metal screws

Screws with large threads for use in sheet metal sometimes also used in plastic, fiberglass, or wood.
Machine screws phillips truss head

Machine screws

Screws with machine threads for use with a nut or in a tapped hole.
Phillips truss head serrated sex bolt

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.