3 x 4 x 5.1 Hirobo HI2521108 Shaft Collar for Hirobo Helicopter Parts  [HI2521108]

Small shaft stop for Hirobo models

This Hirobo HI2521108 collar serves as a small-scale RC part intended for use with Hirobo helicopter general parts. It works as a shaft collar to keep components located axially on model shafts and helps maintain correct alignment of rotating elements with adjacent assemblies.

Fitting is simple: slide the collar onto the shaft at the required spot and secure it so axial movement is blocked. It is typically used where a compact, repeatable stopping point is required between bearings, gears, or hub parts; verify fit before committing to any changes.

For trimming rotorhead or tail setups, collars like this lock fine positional settings and help retain trim between flights. Inspect the item periodically for wear and confirm fastenings remain tight to avoid in-flight shifts.