ACME thread forms have a 29° thread angle, the thread height is half the pitch, and the peak and crest are flat. Gaugestools Acme Thread Gauges come in different types. We are providing general-purpose ACME, Centralizing ACME, and also many standard Acme thread gauges in stock with 100% quality assurance. Visit us for more info: https://www.gaugestools.com/acme-thread-gauges/