sentences:  Pitch is a property associated with linear dimensions and so differs whether the standard values are in the imperial (inch) or metric systems.Using "inch" measurements, standard diametral pitch values with units of "per inch" are chosen; the "diametral pitch" is the number of teeth on a gear of one inch pitch diameter.Common standard values for spur gears are 3, 4, 5, 6, 8, 10, 12, 16, 20, 24, 32, 48, 64, 72, 80, 96, 100, 120, and 200.