What is different between module and diametral pitch (DP)?

Both represent the size of the gear tooth, the module is used in the metric system, the larger the number, the larger the gear tooth; DP is used in the imperial system, the higher the number, the smaller the gear tooth.

  • Represents the total size of a gear tooth
  • Measured in inches
  • 1 diametral pitch = 25.400 module