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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.
When you find the number of threads per inch, a fractional screw size would be written: diameter-threads per inch. Example: 1/2-20, 1/2 (inch) being the diameter and 20 threads per inch. click on pictures to enlarge. Most hobbyists don t have a thread pitch gauge, so you can use a scale.You can count how many thread crests are in an inch. If the fastener is short, measure how many in a quarter inch, then multiply by 4.he following is what I explain to my students how screw threads are described. Screw threads have two descriptions. One is its diameter, measured to the height of the threads. The other is how many threads per inch. Or, in metric use, the pitch of the threads that is the measurement from one crest to the next.