Hirobo HI2521085 Collar 3 x 5.2 x 2 — shaft collar for RC helicopter general parts  [HI2521085]

Helicopter shaft collar for RC models

This HIROBO collar (model HI2521085) is an RC-scale shaft collar described by its 3 x 5.2 x 2 dimension set and intended as a general parts item for RC helicopters. The text focuses on the collar's role in securing and aligning rotating elements on model helicopter shafts without assigning specific chassis compatibility.

Use in maintenance and tuning typically involves positioning the collar along a shaft to control axial movement or to register the location of bearings and gears relative to the airframe. Because the supplier information lists the part code and dimensional callout only, confirm fitment against the actual shaft diameter and available axial space on your model before installation.

Installation notes: this collar is an accessory for RC models and should be fitted using the model's standard securing method; avoid forcing the part onto shafts that do not match the stated 3 x 5.2 x 2 dimension profile to prevent damage. When tuning rotor head geometry or replacing worn components, small collars like this help maintain repeatable shaft positions during reassembly.