GPM MG317T/0.5M 40Cr Steel Motor Gear 17T (module 0.5mm, motor tooth diameter 3.175mm)  [MG317T/0.5M]

This GPM MG317T/0.5M motor gear is an RC-scale pinion designed for compact motors that match the listed tooth and module dimensions. The gear is forged from 40Cr steel and finished with a hardened black treatment to improve wear resistance compared with common stock gears, aiming to provide steadier power transfer under normal model use.

Key mechanical notes: the gear has 17 teeth at module 0.5mm and a motor tooth diameter of 3.175mm, featuring a round-shaped motor gear hole and secured by two 3x3 set screws. To ensure proper fit, confirm the motor shaft and gear mesh parameters before purchasing, since only motors that match these dimensions are appropriate.

Installation and tuning role: this pinion is intended for use when adjusting final drive ratios or replacing a worn pinion in a model drivetrain. When installing, seat the gear concentrically on the motor shaft, check mesh with the spur gear, and tighten the two set screws progressively to maintain alignment. Use the gear to experiment with small changes in gear ratio for predictable drivetrain behavior.