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.Flat head screws are used when protrusion of the fastener above the mating surface is unacceptable. machine screws are designed to go through a hole or nut that is pre-tapped to form a mating thread for that screw.
Socket head cap screws supply greater tensile strength than equivalent hex head caps screws, while requiring less surface area to counterbore.Allen/hex keys are used to drive the screw. M5 x 0.8 x 20mm - Socket Head Cap Screw - 304 Stainless Steel - Pkg of 100.