Hirobo HI2521080 2.6 x 4 x 12S Shaft Locator for RC Helicopters  [HI2521080]

This Hirobo HI2521080 collar serves as a compact shaft locator for helicopter maintenance tasks. The 2.6 x 4 x 12S tag defines the nominal dimensions used to match the collar to small shafts and linkages.

Functionally it limits axial movement and helps preserve alignment in assemblies subject to vibration and handling. It is suitable where a small axial stop or positioning element is required in rotor or transmission areas.

Installation is simple: position the collar on the shaft at the required point, align with adjacent components, and secure exactly as the original assembly specifies. After fitting, verify alignment and run an initial slow test to ensure no rubbing or play is present.

In setup and tuning, this collar provides fine control over endplay and spacing. Use it to tweak rotor or gearbox stack height and to maintain correct lateral clearances without altering core parts.