NPT stands for National Pipe Thread Tapered and is one of the most common types of port options in the U.S.  ANSI/ASME B1.20.1 is the U.S. standard referenced for measuring tapered threads on threaded fittings and pipes.  The taper rate for all NPT threads is 1/16 – 3/4-in per foot, measured by the change in diameter over distance.

NPT fittings seal by stretching the threads to the point of force to hold pressure.  A common challenge is over-tightening which can damage the threads and lead to leaks.   Learn more at with content provided by the American Society of Mechanical Engineers [ASME].

Stucchi offers a large selection of hydraulic solutions with NPT port options.