Hirobo HI2521086 12 x 15 x 5 Shaft Collar for Helicopters  [HI2521086]

Shaft collar for helicopter assemblies

This collar is a compact RC-scale part sold as a general helicopter component by Hirobo, designed to act as a fixed spacer or locator on rotating shafts and control linkages.

In service the collar holds components at a set axial position and limits lateral play, helping to keep blade grips, hubs and bearings aligned without affecting the airframe's dynamic tuning.

Fitting is straightforward for hobby-level maintenance: slide the collar to the required position on the shaft, seat it against the adjacent bearing or hub face, and secure with the original set screw or retention method. Check alignment and free rotation after installation.

Perform routine inspections: ensure the collar remains seated after flights, look for wear where it contacts shafts or hubs, and replace if it shows deformation or excess play to maintain consistent control response.