Hirobo HI2500045 Ball Bearing 6 x 15 x 5 mm 696ZZ, 2pcs  [HI2500045]

Precision 696ZZ Ball Bearings for RC Helicopters

This replacement ball bearing set from Hirobo includes two 696ZZ shielded bearings sized 6 x 15 x 5 mm, supplied as 2 pcs for RC helicopter maintenance and small drivetrain repairs. The 696ZZ designation indicates double metal shields that help keep debris out of the bearing race while maintaining low friction for spinning components at model scale.

Where it matters: these bearings are sized for shafts and housings that specify 6x15x5 mm bearings, commonly found in rotor heads, small gearboxes, and motor shaft supports on electric RC helicopters. Use them as direct replacements when the original bearings share the same dimensions and shield type.

Installation and tuning notes: press the bearing gently into the hub or housing using a tube or bearing driver that contacts the outer race only, avoid hammering the inner race to prevent race or seal damage, and verify smooth free-spin before reassembly. For tuning, replacing worn bearings can reduce play and vibration, which improves tail response and rotor smoothness without altering gear ratios or motor timing.

Maintenance tips: keep spare bearings clean and lubricated with a light model-grade oil if needed, avoid heavy greases that attract dust, and inspect bearings periodically for lateral play or roughness that indicates replacement is required.