The term “thread pitch” specifically refers to the distance between corresponding points on adjacent threads. In the world of firearms, it is most often used as part of a description involving muzzle devices and has specific industry standards to reduce the possibility of mating the wrong muzzle device to a specific caliber, i.e., ½ x 28 for .223/5.56 x 45 NATO and 5/8 x 24 for .308/7.62 x 51 NATO as examples. Thread pitch is measured in either Imperial (inch) or metric patterns and can be either right or left-hand thread pattern, i.e., 9mm is often threaded for M13.5 x 1 LH or ½ x 28 RH.