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 |