Hirobo HI2521062 Precision Shaft Collar 5 x 6 x 9.5  [HI2521062]

Shaft collar overview for assembly

This Hirobo HI2521062 collar is built for small-scale RC helicopters to locate and retain components on thin shafts. Its compact footprint and defined internal bore make it suitable where precise axial positioning is required during build or servicing.

When fitting the collar, confirm the shaft diameter against the 5 x 6 x 9.5 designation to ensure correct fit. Slide the collar to the required axial position, check alignment of adjacent parts, and secure using the collar's fastening method. After installation, perform a low-speed spin check and a visual inspection to verify concentricity and clearance before flight.

As a setup aid the collar serves as a simple mechanical stop or spacer; replacing worn or deformed collars can restore consistent component spacing without altering other drivetrain settings.