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Cap Screws are designed to go through a hole or nut that is pre-tapped to form a mating thread for that screw. Flat head screws are used when protrusion of the fastener above the mating surface is unacceptable. Allen/Hex Keys are used to drive the screw.<br><br>

Flat Socket Cap Screw - 4-40 x 3/8&quot; - Steel Alloy - Thermal Black Oxide - FT - UNC - 100 Pk

211018-flat-socket-cap-screw-4-40-x-3-8-steel-black-oxide-ft-unc-pkg-of-100

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