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Threading Information
Abbreviation System Name Compatibility Seal Method
BSPP British S tandard Pipe P arallel
male BSPP with female BSPP washer
female BSPP with male BSPP washer
female BSPP with male BSPT washer
BSPTr British S tandard Pipe Taper
male BSPTr with female BSPTr thread
male BSPTr with female BSPP washer
female BSPTr with male BSPTr female BSPTr not
compatible with male BSPP thread
CHT
American Standard Fire Hose Thread (1"
National Hose Thread is Chemical Hose
Thread, also known as Booster Hose
Thread)
1" male NH (NST) with 1" female NH (NST) washer
1" female NH (NST) with 1" male NH (NST) washer
1" thread is used on both ¾" hose & 1" hose not compatible
GHT Garden Hose T hread
male GHT with female GHT washer
female GHT with male GHT washer
thread is same for all size hose not compatible
IPS Iron P ipe S traight T hread generic name for Straight Pipe Thread
see NPSH for compatibility washer
IPT Iron P ipe Thread generic name for All Pipe Thread more information
required
JIC Joint Industrial Committee used with other mating JIC threads mechanical
NH
or
NST
American Standard Fire Hose Coupling
Thread (National Hose thread also known
as National Standard Thread)
male NH (NST) with female NH (NST) washer
female NH (NST) with male NH (NST) thread
pitch and diameters of fire threads may vary
according to local and municipal regulations not
compatible with other systems
washer
NPT American Standard Taper Pipe Thread
(National P ipe Tapered)
male NPT with female NPT thread
male NPT with female NPTF thread
male NPT with female NPSM washer
male NPT with female NPSH washer
female NPT with male NPT thread
female NPT with male NPTF
female NPT not compatible with male NPSM or
male NPSH
thread
NPTF
American Standard Taper Pipe Fuel
Dryseal Thread (National Pipe Tapered
Dryseal)
male NPTF with female NPTF thread
male NPTF with female NPT thread
male NPTF with female NPSM washer
male NPTF with female NPSH washer
female NPTF with male NPTF thread
female NPTF with male NPT thread
female NPTF with male NPSM or NPSH
NPTF with NPTF threads do not require sealant
for the initial use, after that, sealant is required
not compatible
NPSH American Standard Straight Pipe for Hose
Couplings (National P ipe S traight Hose)
male NPSH with female NPSH washer
female NPSH with male NPSH washer
female NPSH with male NPT washer
female NPSH with male NPTF washer
female NPSH with male NPSM washer
NPSM American Standard Straight Mechanical
Joints (National P ipe Straight Mechanical)
male NPSM with female NPSM Seal can be either
mechanical or washer.
Mating fittings must be
of same type.
male NPSM with female NPSH
female NPSM with male NPSM
female NPSM with male NPT
female NPSM with male NPTF
SIPT Straight Iron Pipe T hread generic name for Straight Pipe Thread washer
TIPT Tapered Iron P ipe Thread generic name for Tapered Pipe Thread thread
NYC NYC Fire Department straight thread used in New York City washer
Chicago Chicago Fire Department straight thread used in Chicago washer
Technical Information