HIROBO HI2521074 13 x 16 x 12 Shaft Collar for RC Helicopter Shafts  [HI2521074]

Precision shaft collar for repeatable axial stops

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. It serves as a compact, repeatable axial stop or spacer on driven shafts in helicopter subassemblies where keeping shaft position stable helps maintain rotor tracking and drivetrain alignment.

Fit and use depend on matching the collar's internal bore and external dimensions to the shaft and nearby components. Check the 13 x 16 x 12 sizing against your shaft diameter and the clearance around the frame or rotor head before installation. The item is intended for hobby RC helicopter maintenance, repair, or tuning rather than as a full-system replacement.

When fitted into a build or repair, the collar functions as a positional control element: it can reduce unwanted axial play, help preserve correct gear mesh, and act as a simple reference during iterative setup and trim work.