One way

US Fasteners

One way round head sheet metal screws

Sheet metal screws

Screws with large threads for use in sheet metal sometimes also used in plastic, fiberglass, or wood.
One way round head machine screws

Machine screws

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