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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.
NPSM Straight Pipe Thread Ring Gages. NPSM straight pipe thread ring gages are manufactured per ANSI/ASME B1.20.1. NPSM threads are designed for free fitting mechanical joints. This pipe is often used for special applications where there is no internal pressures and is often found to be more suitable to use. All straight pipe thread ring gages are of Unified screw thread form and are supplied in a class 2A for external threads.