Hirobo HI2521013 Collar 3 x 8 x 9.5S Replacement Part  [HI2521013]

Shaft collar for RC helicopter assemblies

This collar is an RC replacement listed under Hirobo helicopter general parts. The designation 3 x 8 x 9.5S describes the nominal dimensions intended to match shaft and linkage tolerances on small to medium RC helicopters. It serves as a compact spacer or collar that locates rotating or sliding parts along a shaft.

Fit it when working on tail or main rotor linkages, shaft joints, or any collared connection requiring precise axial placement. Installation normally involves sliding the collar to the required position on the shaft and securing it according to the original assembly method; always consult the kit service guidance for retaining hardware and torque recommendations.

As a low-cost spare, confirm fit and check for runout before final assembly, and keep extra collars available for routine maintenance and pre-flight inspections.