Square nuts are four-sided nuts as opposed to the more common hex (six-sided) nuts. The surface area on the flats is larger than hex nuts, which reduces wrench slippage. square nuts are available in smaller sizes and also smaller in width and thickness than regular square nuts.
Square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening, but also a greater resistance to tightening as well. Square nuts are used along with flat washers in order to avoid damage from their sharp edges and help to increase the strength of the fastener.
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