RC Helicopter Shaft Collar 3 x 8 x 1.5 HI2521115 by HIROBO  [HI2521115]

Compact spacer for helicopter shafts

This HIROBO collar serves as a small spacer or bushing used inside RC helicopter assemblies. The model code HI2521115 together with the size 3 x 8 x 1.5 denotes inner diameter, outer diameter and thickness, so it fits applications needing minimal axial clearance and straightforward shaft alignment in general helicopter parts.

Typical role: the collar acts as a thin spacer between rotating parts or between a shaft and bearing surface to help keep concentric alignment and reduce lateral play during setup. It is commonly used where a repeatable, slim gap is required in linkages, rotor hubs, or small rotary shafts.

Installation notes: slide the collar onto the shaft or into the bore as needed, check that components rotate freely before final assembly, and verify there is no interference with nearby parts. Use regular hobby tools to add or remove collars while setting clearances; always confirm final spacing with the rotor stationary.