Threading Information

 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