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

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

Price:

AUD$11.31

Brand:

GPM

Model:

MG221T/0.5M

GTIN:

4894538411560

Condition:

Brand New

Color Available:

Quantity:

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Description
FAQ

Product summary and fitment

This 21T pinion is machined from 40Cr steel and intended for direct connection to spur gears at a 0.5mm module in small scale electric RC models. The motor hole is a round bore sized for two 3x3 set screws and the part is finished with a black heat treatment to improve hardness and wear resistance for typical model use.

Tuning note: confirm motor shaft and gear module dimensions before buying to avoid mismatched engagement. Fit the gear squarely on the shaft, then tighten each set screw in turn to maintain concentricity and minimise vibration at speed.

What impact does pinion size have on drivetrain tuning?

Pinion tooth count affects final gearing; a larger pinion raises top speed but reduces acceleration, while a smaller pinion increases acceleration but lowers top speed. Keep module and tooth diameter consistent with the spur for reliable operation.

Any advice for avoiding gear vibration after installation?

Ensure the pinion is fully seated and the two set screws are tightened evenly. Check shaft runout and, if needed, lightly lap mesh or adjust motor mount shims until vibration is eliminated.