Hirobo HI2508003 S-12 Stop Ring 5pcs for RC Helicopter Linkages  [HI2508003]

S-12 Stop Rings for Scale Helicopters

This RC-scale accessory is a set of five S-12 stop rings intended for general helicopter parts and maintenance tasks. The rings act as axial retainers in small rotor and drivetrain assemblies where limiting shaft movement is required. The pack quantity and S-12 size fit common small shafts used 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, correctly seated stop rings support consistent head geometry and keep small components secure during bench setup or field adjustments.

Materials and exact tolerances are set by the manufacturer, so confirm fit on the target shaft before final assembly. Treat this component as an RC-scale part and do not use it in any full-size machinery.