HIROBO HI2521047 Collar for Helicopter Shafts 3 x 8 x 9  [HI2521047]

Compatibility and Use

This collar is offered as an RC accessory intended for use where a 3 x 8 x 9 collar dimension is necessary among helicopter general parts. It serves as a straightforward mechanical retention piece to locate and hold rotating shafts or small linkages on model helicopters that use HIROBO general parts.

Fitment is simple: place the collar at the desired axial location, verify concentricity with the mating parts, and secure it using the original fastening method. For set-screw variants ensure correct screw seating and do not overtighten to avoid damage to the shaft surface. Periodic inspections after flights or adjustments will confirm the collar remains correctly positioned.

For repairs and refurbishment the collar provides stable axial restraint for items such as rotor linkages, swashplate connections, and other small shaft-mounted fittings, preserving mechanical geometry without changing the rotor head dynamics.