Hirobo HI2521066 RC Shaft Collar 6 x 8 x 3.5 Axial Locator  [HI2521066]

Low-profile shaft collar for model helicopters

This Hirobo collar is a compact accessory tailored to small RC helicopter work. The 6 x 8 x 3.5 sizing identifies the internal bore, outer diameter and thickness so you can match it to small hollow shafts and linkage rods. It functions as an axial stop or locator to manage shaft position without impeding rotation.

Installation is straightforward: move the collar onto the shaft to the needed position, then tighten the collar contact point until the fit is secure and axial play is eliminated. Inspect surrounding linkages and rotor components for correct clearance before completing the fitment to prevent binding. Always verify the collar fits your specific shaft prior to flight.

When tuning, the collar helps preserve control geometry by holding bearings and links in the correct axial spot, improving consistency when trimming or swapping components. Intended for hobby model helicopter use.