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KEY WORDS: FITTINGS SALES/COUPLERS/VALVES
  • NPSH/IPT NHR/GHT NH/NST

NPSH/IPT NHR/GHT NH/NST
ANSI Standard Hose Coupling Threads for NPSH, NH and NHR Nipples and Coupling Swivels
NH/NST = American Standard Hose Coupling Threads of Full Form
NHR/GHT = American Standard Hose Coupling Threads for Garden Hose Applications
NPSH/IPT = Dryseal American Standard for Hose Coupling Joints with Straight Internal and External Loose Fitting Threads
NPSH-tech
NPSH1-tech
Commonly Used U.S. Fire Hose Connection Threads
 National StandardNational Pipe Straight Hose
  NH or NST NPSH or IPT
 Size  ODM  TPI  ODM  TPI
 3/4"  1.375  8  1.035  14
 1"  1.375  8  1.295  11.5
 1 1/2"  1.990  9  1.878  11.5
 2"  2.515  8  2.352  11.5
 2 1/2"  3.068  7.5  2.841  8
 3"  3.623  6  3.470  8
 3 1/2"  4.243  6  3.970  8
 4"  5.010  4  4.470  8
 4 1/2"  5.760  4  4.970  8
 5"  6.260  4    
 6" 7.025   4    

GHT (1/2" or 5/8" or 3/4") -- 1.0625 ODM, 11-1/2 TPI

ODM = Outside Diameter of Male TPI = Threads Per Inch
Abbreviations for tapered iron pipe thread is NPT (National Pipe Tapered) or TIPT (Tapered Iron Pipe Thread) - mechanical seal.
Abbrev. for straight iron pipe thread is NPSH (National Pipe Straight Hose), IPT or SIPT (Straight Iron Pipe Thread) - gasket seal.
Abbrev. for straight fire hose thread is NH (National Hose) or NST (National Standard Thread) - gasket seal.
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