Hirobo HI2521113 Collar 3 x 6-12-10 x 11.2S RC Helicopter Shaft Retainer  [HI2521113]

Compact shaft collar for RC helicopters

This collar is supplied as a compact shaft retention component intended for RC helicopter applications. It secures the axial position of small parts on shafts and helps prevent unwanted lateral play during flights or while bench tuning.

Fitting is simple when the collar matches the shaft diameter: slide it in place, align components, then tighten the screw or clamp used by the design. Verify smooth shaft rotation after securing to avoid binding that can upset rotor balance.

During setup and servicing the collar works as an adjustable stop for linkages and spacers, helping keep pitch and tail geometry stable. Employ it to lock parts when adjusting pitch links, swapping small bearings, or setting end-play on rotor and tail shafts.