Hirobo HI2521096 Collar for Helicopter Shafts  [HI2521096]

Robust collar for Hirobo helicopter assemblies

The Hirobo HI2521096 collar is a compact shaft retainer designed for use within Hirobo helicopter general parts. As a mechanical stop it keeps components seated on the shaft and preserves axial positioning within rotor and transmission arrangements. The following notes cover practical compatibility, routine care, and how the collar supports reliable operation.

Compatibility: listed under Hirobo helicopter general parts, it fits where the specified collar dimensions and shaft sizes match. Verify actual shaft measurements and nearby clearances prior to installation to prevent rubbing or misfit.

Installation and service role: fit the collar at the chosen location and clamp it so the retained assembly cannot shift during operation. Typical roles include securing gear placement, preserving rotor spacing, and enabling consistent alignment for tracking adjustments. During maintenance look for wear, deformities, or surface damage and replace the collar if it no longer clamps securely.