Hirobo HI2521085 3 x 5.2 x 2 Shaft Collar - RC Helicopter Parts  [HI2521085]

Shaft collar for model helicopter shafts

This Hirobo collar (model HI2521085) is a shaft collar specified as 3 x 5.2 x 2 and supplied as a general parts item for RC helicopters. The description emphasises the collar's use in locking and aligning rotating elements on small helicopter shafts without claiming fitment to any particular airframe.

In maintenance and setup the collar is typically located on a shaft to restrict axial movement or to establish the relative position of bearings and gears inside the rotor assembly. Because the listing provides only the part code and dimensions, check the collar against your actual shaft diameter and the available axial clearance on your model before you fit it.

Installation tips: this collar is an accessory for RC models and should be secured using the model's standard retention method; do not force the collar onto shafts that do not match the stated 3 x 5.2 x 2 profile to avoid damage. When adjusting rotor geometry or replacing worn parts, small collars like this help preserve consistent shaft positioning during reassembly.