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5/16-18X4 Slotted Indented Hex Washer Head Machine Screw Fully Threaded Zinc. Machine Screws are designed to go through a hole or nut that is pre-tapped to form a mating thread for that screw. Indented hex washer head offers advantages of hex head, plus greater protection to mating surface.

5/16-18X4  Slotted Indented Hex Washer Head Machine Screw Fully Threaded Zinc, Pkg of 200

5-16-18x4-indented-hex-washer-head-machine-screws-3164MSW

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