Thread Plug Gauges

ISO Metric Thread Plug

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


Standard tolerance:   Plug 6H

UN Thread Plug

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. Example: #6-32 UNC 2B (major diameter: 0.1380 inch, pitch: 32 tpi) Unified Screw ThreadsUNC, UNF and UNEF 


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 Check Plug for Ring Gauges

Description TBA