Hirobo HI2521013 3 x 8 x 9.5S Shaft Collar Spare  [HI2521013]

Precision collar for rotor shaft locations

This part is an RC-scale spare listed under Hirobo helicopter general parts. The label 3 x 8 x 9.5S refers to the nominal sizing used to align with shaft and linkage tolerances in small and medium RC helicopters. It acts as a spacer/collar to position rotating or sliding components accurately on a shaft.

Use the collar when overhauling tail or main rotor linkages, shaft couplings, or other collared fixtures where exact axial placement matters. Typical installation is to slide the collar onto the shaft to the chosen position and secure it per the kit's instructions; always follow the original retaining hardware and torque guidance.

Because this is a simple and low-cost replacement, inspect fit and runout before reassembly and keep spare collars available for scheduled maintenance and pre-flight checks.