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Description Of Threads
NPT THREADS NPT (NATIONAL PIPE TAPERED)AND IPT(IRON TAPERED)ARE THE MOST COMMONLY USED RIGID PLUMBING ON FIRE EQUIPMENT NPSH THREADS NPSH (NATIONAL STRAIGHT PIPE THREAD) COMMONLY REFERRED TO AS "HOSE THREAD" OR "PIPE THREAD" MOST COMMONLY USED FOR 1" FIRE HOSE NH THREADS / NST (NATIONAL STANDARD THREAD) COMMONLY REFERRED TO AS "FIRE THREAD" ,ALSO CALLED COARSE THREAD;IT IS THE STANDARD FOR FEDERAL AGENIES ON 1 1/2" HOSE GHT THREADS GARDEN HOSE THREAD COMMONLY USED ON 3/4" HOSE
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