Our Grade 316 Stainless Steel NPT 3000lbs Screwed Fittings Range
Stattin Stainless stocks a comprehensive range of Grade 316 NPT 3000lbs screwed fittings. This collection includes Full Couplings, Hex Nipples, Solid Hex Plugs, Toe Nipples and NPT/BSP Adaptors.
Sizes stocked are 08 NPT (1/4"), 10 NPT (3/8"), 15 NPT (1/2"), 20 NPT (3/4"), 25 NPT (1"), 32 NPT (1 1/4"), 40 NPT (1 1/2"), 50 NPT (2"), 65 NPT (2 1/2"), 80 NPT (3").
National Pipe Thread
NPT stands for National Pipe Thread and is an American standard thread. It may also be reffered to as MPT , MNPT or NPT (M) for male external threads and FPT, FNPT or NPT(F) for female interal threads. A thread sealant must always be used to achieve a leak free seal (except for NPTF). It is also based on Trade Size rather than actual diameter (similar to BSP in this regard).
Both threads have the same pitch, angle (60 degrees) and shape (flat peaks and valleys).
The below table gives the Threads Per Inch, Pitch and Major Diameter for NPT Threads.
BSP vs NPT
NPT threads are common in the United States and also used in Australia, BSP threads are widely used in many other countries.
BSPT -British Standard Pipe Taper
BSPP -British Standard Pipe Parallel
NPT -National Pipe Taper
NPS -National Pipe Straight
While the actual specified outside diameters of American National Pipe differ slightly from those of British Standard Pipe, either thread may reliably be cut onto a pipe of its respective trade size. BSPT equivalent is NPT and BSPP’s equivalent is NPS.
Never swap threads if it is a high pressure application.
NPT/NPS and BSP threads are not compatible due to the differences in their thread forms, and not just the fact that most sizes have a different pitch. NPT/NPS threads have a 60° angle and have flattened peaks and valleys (Sellers thread form) where as BSP threads have a 55° angle and have rounded peaks and valleys (Whitworth thread form).
NPT and BSP thread pitches (threads per inch) are listed below. To determine pitch, use a thread gauge or count the number of threads that fall into a 1" span.
Rating: Threaded End – 3000lbs
Threads: ANSI B1.20.1 – American National Standard Taper Thread (NPT)
ASTM A182/A182M-12a - Standard Specification for Forged or Rolled Alloy and Stainless Steel Forged Fittings
ANSI B16.11 (2009) - Forged Steel Fittings, Socket - Welding and Threaded