The units of DP are inverse inches (1/in). UK system (inch measure) gears are more commonly specified with the Diametral Pitch (DP) which is the number of teeth per inch of diameter of the pitch circle. Module is commonly expressed in units of millimeters (mm). Module may also be applied to UK system gears, using inch units, but this usage is not in common use. Module is the pitch circle diameter divided by the number of teeth. It is similar to the Diametral Pitch (DP), which is commonly used for UK system (inch measure) gears but they differ in the units used and in that they bear a reciprocal relationship. The module is the measure of gear tooth size which is normally used for metric system gears. When one of the gears is a rack, the line of centers is perpendicular to its pitch line. The line of centers connects the centers of the pitch circles of two engaging gears it is also the common perpendicular of the axes in crossed helical gears and worm gears. Main article: Lead (engineering) Line of centers
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