An (army-navy) Fitting Thread Size Chart. Black pipe has a much thicker wall than hard line, so the. An fittings use a 37 degree flare as the sealing surface.
Bsp thread identification british standard pipe (bsp) also referred to as whitworth threads, the bsp thread type fittings seal using metal to metal angled surfaces or a. An size and an thread size reference chart the chart. Place fitting against base line;
For example, a 3/8” npt port will have an outside diameter of 5/8”, allowing for a wall thickness of 1/8” (0.125”).
They were originally used in the aerospace industry. This is known as “an thread size”. An sizes are fairly easy to understand as long as you remember the rule of thumb that the an size is the number of 1/16 that the hose is. Find your perfect fit with army surplus world's sizing charts.
