- NPSH/IPT NHR/GHT NH/NST
ANSI Standard Hose Coupling Threads for NPSH, NH and NHR Nipples and Coupling Swivels
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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 
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| National Standard | National 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.