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Knowledge Base

The Difference Between an Acme Thread and a NPT or BSP Thread

Image courtesy of hunter industries

NPT or NATIONAL PIPE THREAD has become a US standard for tapered threads used on pipe and fittings. The taper rate for all NPT thread is 1/16 th of an inch. When torque is applied to an NPT fitting compression will cause the flanks to create a seal; as opposed to the alternative parallel or straight thread fittings, which thread merely to hold pieces together not to provide a seal.

ACME inlet threads have become the preferred thread configuration in the golf course irrigation market. An Acme thread has a flat apex and valley, and a wider tooth shape than an NPT thread. The wider tooth means it can withstand a greater load than a similarly sized square thread or NPT thread. An Acme thread also contains an O’ring to create a better seal.

Hunter manufactures ACME ADAPTER BUSHINGS in sizes ranging from 1″ to 1 1/2″ and multiple configurations are available to convert female and male NPT threads to ACME.

NOTE: ACME THREADS ARE NOT COMPATIBLE WITH NPT OR BSP FITTINGS.

 

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