Hirobo HI2521013 Collar 3 x 8 x 9.5S - Collar part  [HI2521013]

Helicopter collar component

This collar is an RC-scale replacement part listed under Hirobo helicopter general parts. The designation 3 x 8 x 9.5S indicates the nominal size used to match shaft and linkage tolerances in small to medium RC helicopters. It functions as a compact spacer/collar that helps locate rotating or sliding components on shafts.

Use it when servicing tail or main rotor linkages, shaft joints, or other collared connections where a precise axial position is required. Installation typically involves sliding the collar onto the shaft to the desired position and securing it per the original assembly method; always follow the helicopter kit's service guidance for retaining hardware and torque values.

Because this is a simple, low-cost spare, check fit and runout before reassembly and keep spare collars on hand for routine maintenance and pre-flight checks.