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

Compact S-12 Retainers for Hobby Helicopters

This kit contains five S-12 stop rings made for general helicopter parts and routine maintenance. They function as axial retainers for small-scale rotor and drivetrain assemblies where you need to restrict shaft endplay. The S-12 tag corresponds to common small-shaft groove sizes in many hobby helicopter linkages and bearing housings.

To install, press the ring into the shaft groove so it seats evenly and confirm there is no unwanted axial movement. Properly seated rings assist with setup accuracy and help hold tiny parts steady while you tune or adjust the model.

Check the manufacturer's material and tolerance details to ensure correct compatibility with the shaft before completing assembly. This item is for model use only and not suitable for full-size equipment.