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

40Cr Steel Motor Gear 21T ( Module:0.5mm, Motor Tooth Diameter:2.2mm) - GPM MG221T/0.5M

Price:

NZD$13.54

Brand:

GPM

Model:

MG221T/0.5M

GTIN:

4894538411560

Condition:

Brand New

Color Available:

Quantity:

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Description
FAQ

Technical overview of the pinion

Manufactured from 40Cr steel, this motor pinion offers a 21-tooth profile at module 0.5mm for use in small electric RC drivetrains. The bore is round to accept the two-set-screw 3x3 retention arrangement and the pinion is finished in a black heat-treated coat to improve wear performance under repeated use.

Durability guidance: match the module and motor tooth diameter to your spur gear to ensure correct tooth engagement. When fitting, make sure the gear is seated flush on the motor shaft and tighten the two set screws evenly to retain concentric alignment and reduce vibration during operation.

How does the heat treatment affect service life?

The black heat treatment hardens the surface, which helps resist wear from meshing with the spur gear. It does not change the nominal dimensions, so fitment stays the same while surface durability is improved.

Are there any special torque or fastening tips for the set screws?

Tighten each 3x3 set screw in small increments, alternating between screws to keep the pinion seated evenly. Avoid over-torquing which could damage the shaft; use thread locker sparingly if needed for vibration-prone setups.