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2-1/2", Allen flat head

US Fasteners, 2-1/2", Allen flat head

Socket flat head screw

Socket screws

Screws with an Allen wrench drive.

Socket flat head 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.