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Safety &Technical
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Abbreviation System Name Compatibility Seal Method
BSPP British S tandard P ipe Parallel
male BSPP with female BSPP washer
female BSPP with male BSPP washer
female BSPP with male BSPT washer
BSPTr British S tandard P ipe 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 Thread
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 Straight Thread 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 Pipe 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 T apered 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 Pipe
Straight 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 Pipe
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 Thread generic name for Straight Pipe Thread washer
TIPT Tapered Iron P ipe Thread generic name for Tapered Pipe Thread thread
NYFD NYFD Fire Department straight thread used in New York City washer
Chicago Chicago Fire Department straight thread used in Chicago washer
Thread Information