A wingnut, wing nut or butterfly nut is a type of nut with two large metal "wings", one on each side, so it can be easily tightened and loosened by hand without using tools. A similar fastener with a male thread is called a wing screw.
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A wingnut, wing nut or butterfly nut is a type of nut with two large metal "wings", one on each side, so it can be easily tightened and loosened by hand without using tools. A similar fastener with a male thread is called a wing screw.