Hirobo HI2521071 COLLAR 3 X 7 X 4S Collar for RC helicopter assemblies  [HI2521071]

Helicopter collar for fit and tuning

This collar is an RC-scale replacement part intended for use in Hirobo helicopter assemblies where a compact collar is required to control axial position or spacing. Its compact size, indicated by the 3 x 7 x 4S marking, makes it suitable as a small spacer or locating collar in rotor head linkages and related general parts.

Installation is straightforward: the collar mounts onto the relevant shaft or pin and is secured by the model's existing fastening method. Check for correct axial alignment and minimal play after fitting, and re-tighten the host fastener to the manufacturer-recommended torque to avoid loosening during operation.

In tuning and setup, this collar's role is to provide consistent spacing and repeatable positioning; use it when adjusting blade pitch geometry, blade grip alignment, or when replacing worn locating parts during routine maintenance.