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13, 1", Flat

US Fasteners

Machine screws phillips flat head

Machine screws

Screws with machine threads for use with a nut or in a tapped hole.
Socket flat head screw

Socket screws

Screws with an allen wrench drive.
Sex bolt & Mating screw

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.