Hirobo HI2521106 3 x 6 x 10.4 Shaft Stop Collar  [HI2521106]

Precision spacer for rotor components

This Hirobo collar is a small RC-scale shaft collar with dimensions 3 x 6 x 10.4 as stated in the product name, built for compact helicopter assemblies where precise positioning is required. It acts as a mechanical stop and alignment guide to locate parts on thin shafts and help maintain axial position during setup and adjustments.

To fit the collar, slide it onto the intended shaft, align to the required point and secure using your model's fastening method. Avoid over-tightening set screws to prevent shaft deformation and always check fit before finalising the build. As a generic collar, verify shaft diameter and clearance in your model prior to use.

When tuning, the collar can be applied as a fine spacer for incremental adjustments, useful for setting rotor linkage travel or mounting small accessories. Supplied as a single item for RC maintenance and alignment tasks.