ACME-C Acme Thread-Centralizing  
  ACME-G Acme Thread-General Purpose  
  AMO American Standard Microscope Objective Thread  
  ANPT Aeronautical National Form Taper Pipe Thread  
  (Ground thread tap marked NPT)  
  BA  British Association Standard Thread  
  BSF British Standard Fine Thread Series  
  BSPP British Standard Pipe (Parallel) Thread  
  BSPT British Standard Taper Pipe Thread  
  BSW British Standard Whitworth Coarse Thread Series  
  M Metric ScrewThread Series  
  N American National 8, 12 and 16 Thread Series (8N, 12N, 16N)  
  N BUTT American Buttress Screw Thread  
  NC American National Coarse Thread Series  
  NEF American National Extra Fine Thread Series  
  NF American National Fine Thread Series  
  NGO National Gas Outlet Thread  
  NGT National Gas Taper Thread (see "SGT")  
  NH American National Hose Coupling and Fire Hose Coupling Threads  
  NPS For tap marking only (See NPSC, NPSM)  
  NPSC American National Standard Straight Pipe Thread in Pipe Couplings (Tap marked NPS)  
  NPSF Dryseal American National Standard Fuel Internal Straight Pipe Thread  
  NPSH American National Standard Straight Pipe Thread for Hose Couplings  
  NPSI Dryseal American National Standard Intermediate Internal Straight Pipe Thread  
  NPSL American National Standard Straight Pipe Thread for Loose Fitting Mechanical Joints with Locknuts  
  NPSM American National Standard Straight Pipe Threads for Free-Fitting Mechanical Joints for Fixtures (Tap marked NPS)  
  NPT American National Standard Taper Pipe Thread (See ANPT, NPTR)  
  NPTF Dryseal American National Standard Taper Pipe Thread  
  NPTR American National Standard Taper Pipe Thread for Railing Joints (Tap marked NPT)  
  NS American National Thread-Special  
  PTF Dryseal SAE Short Taper Pipe Thread  
  SGT Special Gas Taper Thread  
  SPL-PTF Dryseal Special Taper Pipe Thread  
  STI Special Thread for Helical Coil Wire Screw Thread Inserts  
  Stub Acme  Stub Acme Thread  
  *UN Unified Constant Pitch Thread Series  
  *UNC Unified Coarse Thread Series  
  *UNEF Unified Extra Fine Thread Series  
  *UNF Unified Fine Thread Series  
  UNJ Unified Thread Series with a 0.15011P to 0.18042P Controlled Root Radius on External Thread only.  
  UNJC Unified Coarse Thread Series with a 0.15011P to 0.18042P Controlled Root Radius on External Thread only.  
  UNJF Unified Fine Thread Series with a 0.15011P to 0.18042P Controlled Root Radius on External Thread only.  
  UNM Unified Miniature Thread Series  
  UNR Unified Constant Pitch Thread Series with a 0.108P to 0.144P Controlled Root Radius; Ext. thread only.  
  UNRC Unified Coarse Thread Series with a 0.108P to 0.144P Controlled Root Radius; Ext. thread only.  
  UNRF Unified Fine Thread Series with a 0.108P to 0.144P Controlled Root Radius; External thread only.  
  *UNS Unified Thread-Special  
  V A 60¡ "V" thread with Truncated Crest and Root. The theoretical "V" Form is usually flatted to the user's specifications.  
  WHIT British Standard Whitworth Special Thread  
       
 
 
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