Hirobo HI2521071 Collar 3 X 7 X 4S Locating Collar for RC Helicopters  [HI2521071]

Precision locating collar for rotor assemblies

Built as an RC-scale replacement, this collar fits Hirobo helicopter assemblies where a small collar is needed to define axial position or spacing. The 3 x 7 x 4S dimension marks its compact profile, ideal for use as a spacer or locator in rotor head linkages and other small components.

Fitting is simple: slide the collar onto the appropriate shaft or pin and secure it with the model's existing fastener or locking system. After installation verify axial alignment and minimal play, then retighten the host fastener to the manufacturer recommended torque to prevent loosening in use.

During setup and tuning the collar provides consistent spacing and repeatable positioning. Fit it when refining blade pitch geometry or blade grip alignment, or replace worn locating parts as part of regular maintenance.