MG221T/0.5M 21T 40Cr Motor Pinion (0.5mm Module, 2.2mm Tooth Dia) by GPM  [MG221T/0.5M]

40Cr Steel Motor Gear 21T ( Module:0.5mm, Motor Tooth Diameter:2.2mm) - GPM MG221T/0.5M
Price:
USD$7.90
Brand:
GPM
Model:
MG221T/0.5M
GTIN:
4894538411560
Condition:
Brand New
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Compact pinion for small electric RCs

This 40Cr steel motor gear is machined as a compact pinion for direct motor-to-spur engagement in small electric RC models. It features 21 teeth at module 0.5mm and fits motors with a 2.2mm motor tooth diameter. The round bore matches a two-set-screw 3x3 retention and the black heat-treated finish improves surface hardness to resist wear under standard model use.

Fitment advice: verify motor shaft and spur gear module before ordering to ensure correct engagement. Install the pinion flush on the shaft and tighten the two set screws alternately to maintain concentricity and minimise vibration during running.

Can I use this pinion with any spur gear of the same module?

Yes, as long as the spur gear is specified for 0.5mm module and the motor accepts a 2.2mm motor tooth diameter pinion. Always confirm dimensions to avoid mismatched tooth profiles.

Best practice for securing the pinion to reduce slip?

Seat the pinion fully on the motor shaft, tighten the two 3x3 set screws in small steps while checking concentricity, and consider light thread locker if the setup is subject to heavy vibration.