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Specifications of International Thread Standards
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The most frequently used thread standard is the metric ISO Thread. However, there are other thread standards as well. These are either based on foreign standards or are used for special applications. E.G. in the medical technology in aeronautical engineering or astronautics.

The most common threads are:
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  • ISO Thread (metric)
  • Whitworth Thread
  • Pipe Thread
  • Trapezoidal Thread
  • Knuckle Thread
  • Buttress Thread
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Abbreviation Country Thread Angle
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Description
      ISO @ 60X  International Organization for Standardization
      NC USA 60X  National Coarse
      UNC USA 60X  Unified National Coarse
      NF USA 60X  National Fine
      UNF USA 60X  Unified National Fine
      UNEF USA 60X  Unified National Extra Fine
      UN USA 60X  Unified National 8-,12- and 16 pitch series
      UNS USA 60X  Special Threads of American National Form
      NPT USA 60X  National Taper Pipe 1:16
      NPTF USA 60X  National Taper Pipe Dry seal 1:16
      NPS USA 60X  National Standard Straight Pipe
      NPSM USA 60X  National Standard Straight Pipe for free fitting mechanical
      NPSF USA 60X  National Standard Internal Straight Pipe Dry seal
      BSW GB 55X  British Standard With worth Coarse
      BSF GB 55X  British Standard Fine
      BSP GB 55X  British Standard Pipe
      BSPT GB 55X  British Standard Pipe Taper
      BA GB 47X  British Standard Association
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 ISO Metric Fine Thread  BSF Threads
 ISO Metric Coarse Thread  BSW Threads
 UNC Threads  BSP Threads
 UNF Threads  BSPT Threads
 UNEF Threads  Pg Thread
 NPT Thread  Löwenherz Thread
 NPTF Thread  Knuckle Thread
 8-UN Thread  Sewing Machine Thread (Nähnorm 100)
 12-UN Thread  C.E.I.-Thread (Cycle Engineer Institution Thread)
 16-UN Thread @ @ @
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