8 x 10 x 1 Hirobo HI2521130 Precision Shaft Collar for RC Helicopter Linkages  [HI2521130]

Shaft locator for small-scale helicopters

This Hirobo collar serves as a compact locator for RC helicopter assemblies where accurate axial positioning is needed. The marking "8 x 10 x 1" identifies the nominal size that hobbyists use to match collars to shaft diameters and the required spacing on swashplates, linkages, and other small rotating elements within the model.

Functionally the collar provides an interface for retention: place it at the required position on the shaft and lock it using the model's chosen method. That may include a set screw integrated in the collar, a clamp-style design, or securing adjacent fasteners with an approved threadlocker; the part simply provides the contact point for those methods.

During trimming or geometry adjustments the collar helps maintain consistent positions for washers and linkage ends, making repeatable setup easier. Treat it as a maintenance or spare item for fine adjustments rather than a substitute for structural bearings or heavy duty load points.