Hirobo HI2521130 8 x 10 x 1 Shaft Collar Stop for RC Helicopter Assemblies  [HI2521130]

Compact shaft collar overview

This Hirobo collar is a compact RC-scale accessory intended for use in helicopter general parts where a small, precise shaft stop or locator is required. Its product name indicates the nominal size marking "8 x 10 x 1", used by builders and tuners to match shaft diameters and axial position needs on swashplates, linkages, and small rotating shafts inside the model helicopter drivetrain.

In practical terms the collar acts as a mechanical locator: place the collar at the desired axial position on the model shaft, then secure it with the model's existing retention method. Depending on your setup that may be a set screw in the collar, clamp mechanism, or an approved threadlocker on mating fasteners; the component itself provides the interface point for those retention methods.

When tuning rotor head geometry or trimming control linkages this collar can simplify repeatable adjustments by holding washer stacks and linkage ends at a consistent position. It is best treated as a small replacement or spare part for maintenance and fine adjustments rather than a high-load primary bearing or structural member.