3.175mm Motor Pinion 13T 0.5M MG313T/0.5M by GPM  [MG313T/0.5M]

This MG313T/0.5M motor gear is an RC pinion intended as a direct replacement for motors that match the specified tooth diameter and module. The part is made from 40Cr steel and receives a hardened black finish to enhance surface wear resistance and extend service life under normal hobby conditions.

Key geometry includes 13 teeth (13T), module 0.5mm, a motor tooth diameter of 3.175mm, and a round motor gear bore. The pinion secures to the motor shaft using two set screws (3x3), enabling straightforward installation on compatible motors. Always confirm these dimensions on your motor before purchase to ensure correct fit.

Installation and tuning tips: position the pinion so the set screws engage a flat or key on the shaft, tighten the screws evenly and check mesh with the spur gear to prevent binding. Altering pinion tooth count changes final drive ratio and therefore affects acceleration and top speed; use this pinion when experimenting with gearing for on-track tuning.