HIROBO HI2521074 Collar 13 x 16 x 12 — Shaft collar for RC helicopter components  [HI2521074]

Shaft collar for precision shaft positioning

This collar is an RC-scale shaft collar listed under Hirobo helicopter general parts, identified by the model HI2521074 and the 13 x 16 x 12 marking. Its role is to provide a compact, repeatable axial stop or spacer on driven shafts in helicopter subassemblies where maintaining shaft location affects rotor tracking and drivetrain alignment.

Use and fit depend on matching the collar's internal and external dimensions to the shaft and surrounding components. In practice, check the 13 x 16 x 12 sizing against the shaft diameter and the available clearance on the helicopter frame or rotor head before installation. The part is intended for hobby RC helicopter maintenance, repair, or tuning tasks rather than full-system replacements.

When integrating this collar into a build or a repair, consider its function as a positional control element: it can help reduce unwanted axial movement, assist in maintaining gear mesh relationships, and provide a simple reference point during iterative setup and trim adjustments.