Hirobo HI2500118 3 x 6 x 2.5 mm Shielded Ball Bearing Set 2 pcs  [HI2500118]

3 x 6 x 2.5 mm shielded bearings for precision rotor pivots

This listing comprises two 3 x 6 x 2.5 mm shielded ball bearings (63ZZ) supplied as two pcs for RC helicopter applications. The thin profile suits confined spaces where a low-section bearing is needed to preserve clearance and movement accuracy.

They are typically fitted in small gearboxes, rotor head assemblies, swashplate linkages and tail mechanisms where reduced friction helps maintain crisp control inputs. The 63ZZ shields on both faces reduce dust ingress yet allow light lubrication for continued smooth operation.

Check bore tolerances and press the bearing squarely using the outer race to avoid inner ring damage. Use minimal compatible oil or grease if required, and verify rotation is smooth with no axial play before finishing assembly. Always match both size and shield type when replacing to maintain the model's handling traits.