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Dome nuts or acorn nuts are named that because of the dome on one side of the nut. The purpose of the dome, is that, when used with a threaded fastener with an external male thread, the dome covers the external thread to protect it and other objects close to the sharp screw. As a bonus, for cosmetic purposes, the dome finishes off the look of the screw neatly. Dome nuts can be made of stainless steel, carbon steel or alloy steel for strength. Wemoto stocks a wide range of size options