This 40Cr steel motor gear is a compact replacement pinion for electric motors that require a 0.5mm module and a 3.175mm motor bore. The 20-tooth design includes a round motor hole and is intended to be secured using two 3x3 set screws.
Material and finish: forged from 40Cr steel with a hardened black treatment to increase wear resistance and extend transmission life compared with softer pinions.
Fit and compatibility: confirm your motor specifies a 0.5mm module and a 3.175mm tooth diameter before buying; only motors with those measurements should fit without machining.
Installation notes: slide the gear onto the shaft until the round hole seats, then tighten the two 3x3 set screws. Check gear mesh and backlash against the spur gear to prevent premature wear.
Tuning role: use this steel pinion as a durable replacement or for small gearing adjustments where a tougher material is preferred in scale drivetrain setups.
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