RC Helicopter Shaft Collar 3 x 4 x 8.5F HI2521094 by Hirobo  [HI2521094]

Precision retaining collar for model helicopters

The Hirobo HI2521094 collar is a compact component intended for use on model helicopter and general shaft assemblies. The collar is marked 3 x 4 x 8.5F to help identify the correct size for matching with your shaft and components.

It serves as a locating and retaining part, preventing axial movement of small rotating items like rotor and tail assemblies during setup and tuning. The design suits applications where a slim collar is needed to maintain part position on a shaft.

To fit, position the collar at the desired axial spot that corresponds to the marked dimensions and secure it using the model's compatible fastening method. Always verify seating and run a low-speed check before full-speed operation.