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NATIONAL HOSE THREAD (a.k.a. NH, NST and CHT)

The table below contains the thread specifications for National Standard Threads (NST).  It should be noted that NST is not the only abbreviation for standard fire hose threads.  Other designations for the exact same threads include, but are not limited to, CHT (Chemical Hose Thread) and NH (National Hose).  Today, most manufacturers will stamp their adapters and components with NH in lieu of the other abbreviations.  Further, the National Fire Protection Association (NFPA) defines National Hose threads (NH) in their publication NFPA 1963, "Standard for Fire Hose Connections."

To see our line of adapters with NST threads, click here.

SIZE ODM TPI
1" 1.375 8
1-1/2" 1.990 9
2-1/2" 3.0686 7.5
3" 3.6239 6
4" 5.0109 4
4-1/2" 5.7609 4
5" 6.260 4
6" 7.025 4

 

 

 

 

 

 

 


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Copyright 2006 David's Fire Equipment
Last modified: 03/27/12