RC Shaft Stop Collar 3 x 8 x 17 — Hirobo HI2521090  [HI2521090]

Retention collar for rotor and drivetrain shafts

This Hirobo HI2521090 collar is an RC-scale shaft collar in the 3 x 8 x 17 size, intended as a compact retention element for rotating shafts. Supplied as a single unit, it locates and secures axial position where a small clamping ring is needed.

Fitting is direct: position the collar on a shaft that matches the 3 x 8 x 17 dimensions and fasten using the correct screw or clamp technique for your assembly. The collar controls endplay and keeps alignment between mating drivetrain or rotor parts without modifying other components.

During setup or repairs, fit this collar to stabilise shaft position when adjusting gear mesh, aligning rotor heads, or rebuilding miniature transmission sections. Observe shaft tolerances and surface condition when installing to prevent excessive friction or looseness.