Hirobo HI2521076 Collar 3 x 6 x 17 mm Helicopter General Part  [HI2521076]

Collar for helicopter assemblies

This Hirobo collar is an RC-scale mechanical spacer designed for helicopter general parts, supplied under model HI2521076. As a simple locating and retention element, the collar helps maintain axial position on shafts and within small assemblies used in hobby helicopters. Its compact form suits tight spaces where precise shaft spacing and repeatable alignment are required.

Installation is straightforward for experienced hobbyists: verify shaft diameter and bore clearance before fitting, use a controlled press or gentle tapping to avoid deformation, and confirm alignment after installation. The collar functions as a passive tuning element by keeping gears, pinions, or bearings at the intended spacing, which supports consistent tracking and reduces lateral play.

Material handling and inspection are part of routine maintenance; check for wear or corrosion during service intervals and replace if roundness or fit is compromised to maintain predictable shaft behavior.