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< Product: Size of Gears >

• L : Large : Module is more than 12, or Pitch Circle diameter is more than 1,250mm.
• M : Medium : Module is less than 12, or Pitch circle diameter is more than 100mm and less than 1,250mm.
• S : Small : Module is less than 2, or pitch circle diameter is more than 20mm and less than 100mm.
• ES: Extremely Small : Module is less than 1, or pitch circle diameter is less than 20mm