Hirobo HI2521085 Precision Collar 3 x 5.2 x 2 for RC Helicopter Shafts  [HI2521085]

RC helicopter shaft collar overview

The Hirobo collar (HI2521085) is defined by the 3 x 5.2 x 2 dimension and supplied as a general part for small RC helicopters. The text highlights the collar's purpose of securing and aligning rotating elements on model shafts and does not indicate compatibility with any particular kit.

Typical use in maintenance includes positioning the collar to control axial travel or to mark the location of bearings and gears relative to the airframe. Because only the part code and dimensions are provided by the supplier, check fitment against the actual shaft diameter and the available axial space on your machine before fitting.

Fitting notes: this is an accessory for RC models and should be installed using the model's standard securing approach; do not press the collar onto shafts that do not match the stated 3 x 5.2 x 2 profile to avoid damaging the component or the shaft. Small collars are often used to ensure repeatable shaft positions during reassembly after tuning or servicing.