Hirobo HI2500094 2 pcs Flanged Ball Bearing 4 x 7 x 2.5 mm  [HI2500094]

Product summary and application

The Hirobo HI2500094 flanged ball bearing is supplied as a two-piece pack and measures 4 x 7 x 2.5 mm, making it suitable for compact rotating points in model helicopters and similar RC assemblies. The flange provides a positive face that simplifies axial location in frames and linkages.

Its primary role is to lower friction on shafts and pivots while the flange limits lateral play. When replacing bearings, always check shaft and bore dimensions rather than assuming fit from part numbers, and install with the flange oriented as originally to keep alignment intact.

Routine care: use a compatible low-residue solvent for cleaning, then lubricate lightly with bearing oil or a thin specialist grease. Excessive grease increases drag; inspect for smooth rotation and replace bearings that feel gritty or have wobble.