Compared to standard hex nuts, 4 sided square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening. They are also much less likely to become rounded-off after repeated loosening/tightening cycles. Square nuts are mated with square-headed bolts along with flat washers in order to avoid damage from its sharp edges and help to increase the strength of the fastener. Our Square nuts can have standard, fine or coarse threading with platings of zinc yellow, plain, zinc clear, tin and cadmium, among others. Commonly used in furniture as a blind nut, they are also used in rail channels in order to prevent turning of rail when pressure is applied.