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

Flanged ball bearing overview

This Hirobo HI2500094 flanged ball bearing is an RC-scale replacement part supplied as a pack of two pcs, sized 4 x 7 x 2.5 mm. The flange adds a locating face that simplifies axial positioning in frames, bulkheads, and small rotating linkages commonly found in model helicopters and similar RC assemblies.

For hobby use, the bearing's main role is to reduce friction on shafts and pivots while keeping lateral movement constrained by the flange. When replacing bearings, verify inner and outer diameters on the mating shaft and bore rather than relying on part numbers alone, and keep the orientation of the flange consistent with the original installation to preserve alignment.

Maintenance tips: clean bearings with a low-residue solvent suitable for model parts, then apply a light bearing oil or a small amount of thin greasel designed for RC use. Avoid overfilling with grease which can increase drag. Inspect for play and smooth rotation before flight; replace bearings that feel rough or have noticeable wobble.