Linkage and Shaft Spacer 3 x 8 x 1.5 HI2521115 HIROBO  [HI2521115]

Usage in linkages and rotor hubs

This HIROBO collar functions as a compact spacer or bushing for RC helicopter assemblies. The model HI2521115 and the 3 x 8 x 1.5 size label specify inner diameter, outer diameter and thickness, making it suitable where narrow axial spacing or basic shaft alignment is needed within general helicopter components.

Typical role: the collar provides a thin, repeatable gap between rotating assemblies or between a shaft and adjacent bearing surface to aid concentric alignment and reduce sideways play. It is commonly applied in linkages, rotor hubs, and small rotary shafts where precise spacing matters for setup.

Installation notes: fit the collar onto the shaft or into the bore as required, verify free rotation before finishing assembly, and ensure there is no contact with nearby parts. Use common hobby tools to add or remove collars while adjusting clearances; always confirm spacing while the rotor is static.