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

Purpose and use of the shaft collar

The Hirobo HI2521085 collar is listed with the 3 x 5.2 x 2 dimension set and is offered as a general spare for RC helicopters. The description focuses on the collar's function of locating and retaining rotating parts on model shafts without referencing a specific kit or chassis.

In workshop practice the collar is used to limit axial motion or to register the positions of bearings, gears, and other components relative to the rotor assembly. Since the supplier provides only the part number and size, confirm the collar's dimensions against your shaft and the available axial clearance on the model before installation.

Installation advice: treat this item as an accessory for RC models and fit it with your model's normal securing method; do not force it onto a shaft that does not match the stated 3 x 5.2 x 2 profile to avoid damage. Collars of this type are useful for maintaining consistent shaft placements when replacing or adjusting components.