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

Compact flanged bearing summary

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

In service, the bearing reduces friction on shafts and pivots while the flange controls lateral movement. When replacing bearings, confirm inner and outer diameters on the mating shaft and bore rather than relying only on part numbers, and maintain the original flange orientation to preserve alignment.

Maintenance tips: clean bearings with a low-residue solvent made for model parts, then apply a light bearing oil or a small amount of thin bearing grease. Avoid packing bearings with excess grease which can increase drag. Inspect for play and smooth rotation before flight and replace any bearing that feels rough or shows wobble.