This 40Cr steel motor gear (22T) is an RC-scale pinion designed for small electric motors using a module 0.5mm gear mesh. The hardened black surface treatment increases surface hardness and improves wear resistance under typical model power loads, while the round motor-hole profile is sized for a 2.2mm motor tooth diameter.
Installation notes: the gear secures to the motor shaft with two set screws sized 3x3, and the round hole accepts motors that match the specified shaft and tooth diameter. For reliable engagement check the module 0.5mm pairing with your spur gear and confirm the 22T tooth count fits your gearbox geometry before fitting.
Tuning role: use this gear when you need a durable, compact pinion for adjusting final drive ratios in electric RC models; swapping pinions with the same module and defined tooth diameter lets you tune acceleration versus top speed without modifying the motor or spur gear.
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