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Tooth pitch is defined as the number of teeth per inch (tpi). 1 inch equates to 25.4 mm.
Constant
A distinction is made between constant tooth pitches with a uniform tooth distance and variable tooth pitches with different tooth distances within one toothing interval.
Variable
Variable tooth pitches can be characterized by two measures, e.g. 2-3 tpi. Here, 2 tpi stands for the maximum tooth distance and 3 tpi stands for the minimum tooth distance in the toothing interval.