Shop 45-Degree + FNPT Configurations

National Pipe Tapered (NPT) is one of our most popular thread styles. NPT is a USA standard for tapered threads used on pipes and fittings. They are used to effectively 

seal pipes for fluid and gas transfer. Nominal pipe size can be identified by physically measuring the thread diameter, then subtracting 1/4". 
NPT connections rely on thread deformation, a metal to metal sealing design where the threads of the connectors themselves form together. This design is 
ideal for single assembly applications, and not recommended where connections will be assembled and disassembled frequently. 
Do not over-tighten. We recommend using a thread sealant with this type of connection style.