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0.5M-3.17MM main shaft gear Description: It can be closely matched with the motor shaft with a diameter of 3.17MM:(455/445/484/540/545/550/555/575 form motors, their spindle diameter is mostly 3.17mm)Number of teeth: 14Outer diameter: 8MMThickness: 5MMHole diameter: 3.12MM (recommendation: first warmth the gear and set up it, will probably be steady after cooling)