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Abbreviation System Name Compatibility Seal Method
BSPP British Standard Pipe Parallel Male BSPP with Female BSPP
Female BSPP with Male BSPP
Female BSPP with Male BSPTr
Washer
Washer
Washer
BSPTr British Standard Pipe Taper Male BSPTr with Female BSPTr
Male BSPTr with Female BSPP
Female BSPTr with Male BSPTr
Female BSPTr not compatible with Male BSPP
Thread
Washer
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)
1"Female NH (NST) with 1" Male NH (NST)
1" Thread is used on both 3/4" hose and 1" hose.
Not compatible with other systems
Washer
Washer
GHT Garden Hose Thread Male GHT with Female GHT
Female GHT with Male GHT
Thread is same for all size hose
Not compatible with other systems
Washer
Washer
IPS Iron Pipe Straight Thread Generic Name for Straight Pipe Thread
See NPSH for compatibility
Washer
IPT Iron Pipe 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)
Female NH (NST) with Male NH (NST)
Not compatible with other systems
Thread pitch and diameters of fire threads may vary
according to local and municipal regulations.
Washer
Washer
NPT American Standard Taper Pipe
Thread
(National Pipe Tapered)
Male NPT with Female NPT
Male NPT with Female NPTF
Male NPT with Female NPSM
Male NPT with Female NPSH
Female NPT with Male NPT
Female NPT with Male NPTF
Female NPT not compatible with Male NPSM or Male
NPSH
Thread
Thread
Washer
Washer
Thread
Thread
NPTF American Standard Taper Pipe
Fuel Dryseal Thread (National Pipe
Tapered) (Dryseal)
Male NPTF with Female NPTF
Male NPTF with Female NPT
Male NPTF with Female NPSM
Male NPTF with Female NPSH
Female NPTF with Male NPTF
Female NPTF with Male NPT
Female NPTF with Male NPSM or NPSH
Note: NPTF with NPTF threads do not require sealant
for the initial use. After that, sealant is required.
Thread
Thread
Washer
Washer
Thread
Thread
Not Compatible
NPSH American Standard Straight Pipe
for Hose Couplings (National Pipe
Straight Hose)
Male NPSH with Female NPSH
Female NPSH with Male NPSH
Female NPSH with Male NPT
Female NPSH with Male NPTF
Female NPSH with Male NPSM
Washer
Washer
Washer
Washer
Washer
NPSM American Standard Straight
Mechanical Joints (National Pipe
Straight Mechanical)
Male NPSM with Female NPSM
Male NPSM with Female NPSH
Female NPSM with Male NPSM
Female NPSM with Male NPT
Female NPSM with Male NPTF
Seal can be either
mechanical or washer.
Mating fittings must be
of same type.
SIPT Straight Iron Pipe Thread Generic name for Straight Pipe Thread Washer
TIPT Tapered Iron Pipe 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

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