3 x 5 x 11 RC Shaft Collar - Hirobo HI2521112  [HI2521112]

Function and service life

The HI2521112 shaft collar from Hirobo is sized at 3 x 5 x 11 and is used to locate and retain rotating shafts in small RC assemblies. It provides a simple positional stop for components found in helicopter-related hardware without modifying the primary shaft or nearby parts.

Primary purpose is to control axial position: the collar keeps shaft location stable, reduces unwanted axial play, and assists in maintaining alignment for small gear groups and bearing seats. Because it is a basic mechanical fitting, technicians normally compare the collar's bore and axial length with the shaft and adjacent components to confirm suitability before final installation.

Installation and care: slide the collar to the required point on the shaft and align with mating parts, then secure using your model's set screw or clamping method. Inspect the collar and mating surfaces periodically for signs of wear or loosening, and recheck alignment after any service that disturbs shaft position.