Hirobo HI2521062 Axial Positioning Collar 5 x 6 x 9.5  [HI2521062]

Helicopter shaft collar details

The Hirobo HI2521062 collar is a compact accessory designed to locate and retain parts on thin shafts in model helicopters, delivering accurate axial positioning for assembly and servicing. The defined internal bore supports repeatable placement of components.

Always confirm the shaft diameter using the 5 x 6 x 9.5 marking before fitting. Slide the collar to the chosen axial position, ensure adjacent components are aligned, and secure with the collar's fastening method. After installation, complete a slow-speed spin test and perform a visual check for clearance and concentricity before flight.

Used as a mechanical stop or spacer, replacing worn or misshaped collars helps maintain consistent spacing without altering other drivetrain settings.