This 40Cr steel motor gear is an RC-scale replacement pinion designed for small electric motors that accept a 0.5mm module and a 3.175mm motor bore. The gear has 20 teeth and a round motor hole intended for secure mounting with two 3x3 set screws.
Material and finish: the gear is manufactured from 40Cr steel with a hardening black treatment to improve wear resistance and transmission durability compared with many standard soft metal pinions.
Fit and compatibility: check that the motor you intend to use specifies a 0.5mm module and a 3.175mm motor tooth diameter before purchasing. Only motors matching those parameters should be expected to fit without modification.
Installation notes: align the gear on the motor shaft so the round hole seats fully, then secure with the two 3x3 set screws. Verify gear mesh and backlash with the spur gear before full use to avoid accelerated wear.
Tuning role: this pinion serves as a straightforward drivetrain component for replacement or minor tuning changes, offering a robust steel option when durability is a concern in scale model transmission setups.
Copyright © 2008-2026 rcjaz.com All rights reserved
