6 x 8 x 3.5 Hirobo HI2521066 Shaft Stop Collar for RC Helis  [HI2521066]

Helicopter shaft locating collar

This Hirobo collar provides a compact, low-profile solution for model helicopter maintenance and setup. The dimensions 6 x 8 x 3.5 indicate the internal bore, outer diameter and thickness so you can pair it with small hollow shafts and linkage rods. Its role is to act as an axial locator, limiting shaft movement without interfering with rotation.

To install, slide the collar to the desired axial position on the shaft and tighten the contact point until the fit is secure. Re-check alignment with adjacent linkages and rotor components before final clamping to avoid interference. Always confirm compatibility with your specific shaft before operational use.

In setup and trimming the collar maintains consistent axial placement of bearings and links, which improves repeatability when you make adjustments or replace parts. Intended for hobby model helicopter use only.