Hirobo HI2521088 5 x 7 x 11 Shaft Collar for RC Helicopter  [HI2521088]

Precision shaft stop for RC helicopters

This Hirobo HI2521088 collar is a compact replacement part listed as 5 x 7 x 11 and intended for general helicopter assemblies. Its role is to secure axial position on rotating shafts and to act as a low-profile retention element where space is restricted.

Fitting is straightforward: slide the collar onto the shaft to the required location and secure using the component's existing fastening method. Avoid excessive clamp force to prevent shaft damage and check axial play after fitting. This collar is useful during routine maintenance, part swaps, and minor setup adjustments on RC helicopters.