Thread Compatibility
PDF Download: Thread Compatibility
| Thread | 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 |
Thread Washer Thread |
| 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 |
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| 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 |
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 |
Thread Thread Washer Washer Thread Thread |
| 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 |