Thread Types

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Short List

  • NPSM - National Pipe - Straight Mechanical - closure attained by 30 degree compression fit with a swivel - [1]. Only NPT with chamfer will seal properly with NPSM - other NPT threads may not seal.
  • NPT - National Pipe - tapered
  • R, G - [2]
  • 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 - [3]
  • SAE - with o-rings

Long List

Probably hundreds exist all together.