3 x 5 x 5.1F Hirobo HI2521107 Mini Shaft Collar for Helicopter Models  [HI2521107]

Small-diameter collar for rotor linkages

The Hirobo HI2521107 collar is supplied as a small shaft location part for RC helicopter assemblies, referenced by the size code 3 x 5 x 5.1F to aid correct matching with shafts and components. It serves to locate parts on a shaft or act as a spacer between small components.

Before fitting, confirm the shaft accepts a 3 x 5 x 5.1F collar. Fit by sliding the collar to the desired axial spot and secure it using the model's compatible retaining method. Because the source omits material data, inspect the collar on receipt or ask the seller for details if that affects performance.

Typical uses include adjusting clearance at shaft ends, keeping small gear meshes aligned, and stabilising tiny assemblies in rotor linkages. Store spares with clear size labelling to prevent mix-ups during maintenance.