National Pipe Straight thread (NPS)

Both NPT and NPS have the same 60° included thread angle, flat peaks and valleys, and pitch (TPI, threads per inch). However, NPT threads are tapered and NPS threads are straight (parallel). Note that NPS requires a gasket or O-ring to create a seal.

American National Standard Taper Pipe Thread (*Ref), often called NPT for short. The taper on NPT threads allows them to form a seal when torqued as the flanks of the threads compress against each other. In other words, threaded pipes are able to provide an effective seal for pipes transporting liquids, gases, steam, and hydraulic fluid.

*Ref: Learn more about American National Standard Taper Pipe thread

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