Hirobo HI2508003 Stop Ring S-12 5pcs — stop ring part for RC helicopter general parts  [HI2508003]

Stop Ring S-12 for RC Helicopters

This RC-scale accessory is a set of five S-12 stop rings intended for general helicopter parts and maintenance tasks. The rings serve as axial retainers in small-scale rotor and drivetrain assemblies where limiting shaft movement is required. The pack size and S-12 designation match common small shafts found in hobby helicopter linkages and bearing seats.

Installation is straightforward: seat the ring into the shaft groove so it engages the groove evenly and check for full seating to avoid axial play. As a tuning and alignment aid, properly seated stop rings help maintain consistent head geometry and secure small components during bench setup or field adjustments.

Materials and exact tolerances are specific to the manufacturer, so verify fit on the target shaft before final assembly. This part should be handled as an RC-scale component and not used in any full-size machinery.