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

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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