Thread Ring Gauges

ISO Thread Ring

ISO metric screw threads are the world-wide most commonly used type of general-purpose screw thread

UN Thread Ring

UNC, UNF or UNEF if the diameter-pitch combination is from the "coarse", "fine" or "extra fine" series, and may also be followed by a tolerance class.


National Pipe Thread Taper (NPT) is a U.S. standard for tapered threads used on threaded pipes and fittings. In contrast to straight threads that are found on a bolt, a taper thread will pull tight and therefore make a fluid-tight seal.


Special Thread Ring Gauges

Special thread gauges are define into Adjustable thread ring, special diameter and special pitch. Complete with end threading and without threading. Some precision parts require double thread start or more thread start opening. All this are consider as special thread