Coarse-Thread Series: This series, UNC/UNRC, is the one most commonly used in the
bulk production of bolts, screws, nuts and other general engineering applications. It is also
used for threading into lower tensile strength materials such as cast iron, mild steel and
softer materials (bronze, brass, aluminum, magnesium and plastics) to obtain the optimum
resistance to stripping of the internal thread. It is applicable for rapid assembly or disassembly,
or if corrosion or slight damage is possible.

gaugestools have all these UN coarse thread gauges in stock, anyone need these UN thread gages, welcome to send inquiry to us