Revision as of 16:09, 19 March 2024

Short List

NST - National Standard Thread. Same as GHT (Garden Hose Thread) or NH (National Hose)
GHT - garden hose, used also in fire hose [1]. Same threads per inch as NPT, but not tapered.
NPS - National Piper Thread, same as NPT, but straight. [2]. NPS is not used for high pressure, while NPT can be, such as hydraulics. Does this mean that NPS and GHT are the same?
NPSM - National Pipe - Straight Mechanical - closure attained by 30 degree compression fit with a swivel - [3]. Only NPT with chamfer will seal properly with NPSM - other NPT threads may not seal.
NPT - National Pipe - tapered
R, G - [4]
BSPP - British Pipe thread parallel
BSPT - British Pipe thread tapered
Bolt thread - fine and course
Metric bolt - fine and course
Metric pipe straight
Metric pipe parallel
UN - [5]
SAE - with o-rings

Probably hundreds exist all together.

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 =Short List=
+*NST - National Standard Thread. Same as GHT (Garden Hose Thread) or NH (National Hose)
 *GHT - garden hose, used also in fire hose [https://rawhidefirehose.com/blog/guide-fire-hose-couplings-threading/#:~:text=NH%2FNST%20Threads,also%20referred%20to%20as%20NH.]. Same threads per inch as NPT, but not tapered.
 *NPS - National Piper Thread, same as NPT, but straight. [https://netcamcenter.nl/media/documents/NPT-vs-NPS-pipe-thread.pdf]. NPS is not used for high pressure, while NPT can be, such as hydraulics. Does this mean that NPS and GHT are the same?