Hirobo HI2521112 Precision Collar 3x5x11mm for RC Shafts  [HI2521112]

Adjustment and tuning notes

This Hirobo HI2521112 shaft collar, sized 3 x 5 x 11, is intended as a locating and retaining component for rotating shafts in compact RC assemblies. It gives a straightforward mechanical stop or clamp point that helps maintain shaft position without altering larger components.

Its main role is positional: securing axial location, limiting unwanted axial play, and helping keep small gear trains or bearing seats aligned. As a simple accessory, model builders will typically check bore diameter and axial length against the target shaft and surrounding parts to ensure correct fit before tuning or final assembly.

Fitting tips: slide the collar onto the shaft to the required spot, align with mating components, and tighten the set screw or clamp. For tuning, move the collar in small steps and test spin or run after each adjustment to see how gear mesh or blade tracking responds.