O.S. Engine OS74004038 Security Ring for OMA-3810 and OMA-3805 Motor  [OS74004038]

Security ring for OMA-3810 and OMA-3805 motors

This security ring is a dedicated RC-scale accessory designed to hold components on shafts of OMA-3810 and OMA-3805 brushless motors. It serves as a retention element that prevents axial movement of the rotor assembly or mounted pinion during operation, reducing the chance of unwanted displacement during runs or servicing.

Compatibility is limited to the listed motor models, so confirm your motor code matches OMA-3810 or OMA-3805 before purchase. The part’s role is focused: shaft retention and maintaining axial alignment rather than bearing or gear load support.

Installation is straightforward for users familiar with motor maintenance: position the ring into the designated groove on the motor shaft and verify secure seating by checking for axial play. When tuning motor endplay or swapping pinions, re-check the ring’s engagement to ensure consistent motor behavior on the track.