GPM Racing 40CR Steel Motor Gear 18T (Module:0.5mm,motor Tooth Diameter:3.175mm) (MG318T/0.5M)

Motor pinion for RC drivetrains

This MG318T/0.5M motor gear is an RC-scale pinion designed for motors that match a 0.5mm module and a 3.175mm motor tooth diameter. Made from hardened 40Cr steel, it provides higher wear resistance compared with basic stock gears and maintains consistent tooth profile under load for predictable power transfer in small-scale drivetrains.

The gear has 18 teeth and a round-shaped motor gear bore sized for a 3.175mm motor tooth diameter, secured by two 3x3 set screws to hold position on the motor shaft. Before purchasing, verify your motor shaft diameter, module, and required tooth count to ensure correct fitment; only motors matching these dimensions should be used.

When installing, check alignment with the spur gear, avoid excessive preload, and confirm set screws are tightened to hold without deforming the shaft; correct meshing reduces premature wear and preserves drivetrain efficiency.

What shaft diameter fits this gear?

The gear is made for a motor bore matching a 3.175mm motor tooth diameter, confirm your motor matches this dimension before fitment.

How is the pinion secured to the motor?

The pinion uses a round bore and is fixed with two 3x3 set screws; ensure they are snug and aligned to the motor shaft flats where applicable. 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.