Hirobo HI2508003 S-12 Retaining Rings 5 Pack for Model Helicopters  [HI2508003]

S-12 Retaining Rings for Model Helicopters

This accessory comprises five S-12 stop rings intended for general helicopter parts and routine servicing. The rings act as axial retainers in small-scale rotor and drivetrain components where controlling shaft movement is necessary. The S-12 designation matches commonly used grooves on small shafts found in hobby helicopter linkages and bearing housings.

To fit, press the ring into the shaft groove ensuring it seats evenly and check there is no residual axial movement. Correct installation helps maintain reliable geometry and secures small fittings during setup and transport.

Manufacturer-specific material and tolerance data should be checked to confirm fit on the intended shaft before final assembly. Use these rings only for model-scale applications, not for any full-size equipment.