M/MJ (metric), NPT, NPTF, NPSF, ANPT, BSPT, BSPP, ACME, and buttress. Thread gages measure the size or diameter of the feature being measured. English pitch is the threads per inch that the gage can ...
A metric threading die represents thread by pitch instead of inch, which is the method of thread designation in the United States. In metric thread dies, the thread pitch is specified in millimeters.