GPM Racing #45 Steel Motor Gear 20T (48 Pitch,module: 0.5mm,motor Tooth Diameter: 5mm) (MG520T/0.5M)

Product Summary for Pinion Replacement

This motor pinion is made from 45CR steel and intended as a direct substitute where the specified dimensions match. The gear features 20 teeth (20T), a 48 pitch profile with module 0.5mm, plus a rounded motor hole sized for motors with a 5mm motor tooth diameter.

Key setup values include a total thickness of 10mm, tooth face thickness of 5mm, and tooth face outer diameter of 12mm — useful when confirming mesh and motor shaft alignment. Verify mesh clearance against your spur gear before running.

Installation pointers: seat the rounded hole on the motor boss, secure with the supplied screw shaft, set axial position for correct mesh, and re-check engagement after a short break-in run. This part is for electric scale RC models and not for real vehicle applications.

Packing includes

• Motor Gear 20T - 1pcs
• Screw Shaft 3x3 - 1pcs

Does this pinion suit a 5mm shaft motor?

Yes; the rounded hole is intended for motors that specify a 5mm motor tooth diameter. Confirm full seating on the motor boss before final tightening.

How should I monitor wear on this pinion?

Inspect the tooth faces and check mesh regularly, especially in high-power applications. Replace the pinion if you notice significant tooth rounding or increased backlash.

Any quick checks after fitting?

Hand-rotate the drivetrain to confirm smooth engagement, then perform a short low-speed run and re-check axial position and set screw tightness to ensure stable mesh. 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.