Bordo UNC Carbon Hex Die Nut

UNC = Unified National Coarse

This thread is described by its major diameter and the number of threads per inch of length. This thread series is commonly used in the mass production of bolts, screws and nuts. It us used for threading into lower tensile strength materials (bronze, brass, aluminium and plastics) to obtain the best resistance to stripping of the internal thread. It is also used on quick assembly or disassembly or if corrosion or slight damage is possible.