GPM Racing 40CR Steel Motor Gear 15T (Module:0.5mm,motor Tooth Diameter:3.175mm) (MG315T/0.5M)

Motor pinion gear overview

This MG315T/0.5M motor pinion is an RC-scale replacement part designed for motors that match its dimensions, offering a compact 15-tooth profile with a 0.5mm module. The gear is manufactured from 40Cr steel and finished with a heat treatment and blackened surface to improve wear resistance and maintain consistent meshing over time.

Key dimensions are 15T, module 0.5mm, and motor tooth diameter 3.175mm, with a round motor bore intended to fit corresponding motor shafts. The gear is secured by two set screws sized 3×3, providing a simple mechanical clamp to retain the pinion on the motor shaft.

When integrating this pinion into a model drivetrain, confirm tooth count and module match the mating spur gear to achieve correct gear mesh. Proper seating on the motor shaft and even tightening of the two 3×3 set screws will help prevent slippage; check clearance and alignment after initial run-in and after a few short tests.

What motor shaft diameter is required for this pinion?

The pinion is specified for a motor tooth diameter of 3.175mm, check your motor shaft and bore dimensions to confirm compatibility.

How should I secure the pinion to the motor shaft?

Seat the round bore fully onto the motor shaft, then tighten both 3×3 set screws evenly to clamp the pinion; recheck mesh and tightness after a short run.

What does the 40Cr material and finish mean for durability?

40Cr steel with heat treatment and a blackened finish provides improved wear resistance compared with untreated alloys, helping maintain gear mesh over repeated use. Write Product Review Please sign in your account before you can write any review. Sign In Close

Made to order: GPM Racing parts are shipped to us from GPM’s factory, so please allow around 14 days for dispatch.