Designed as a tough replacement pinion, this 40Cr steel gear fits motors that accept a 0.5mm module and feature a 3.175mm shaft diameter. The 20-tooth pinion uses a round motor hole and is fastened by two 3x3 set screws for secure mounting.
Material and finish: built from 40Cr steel with a hardened black finish to reduce wear and improve lifespan in transmission environments when compared to softer materials.
Compatibility: confirm the motor specifies a 0.5mm module and a 3.175mm motor bore prior to purchase to ensure correct fitment without modification.
Fitting tips: slide the pinion onto the shaft so the hole seats properly, then tighten both 3x3 set screws. Recheck gear alignment and backlash with the spur gear before full-power operation.
Tuning notes: a reliable steel option for replacement parts or modest gearing adjustments where durability is a priority in scale drivetrains.
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