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

Hirobo 696ZZ Shielded Bearings — Rotor and Drivetrain

This replacement bearing set from Hirobo contains two 696ZZ shielded bearings sized 6 x 15 x 5 mm, supplied as 2 pcs for RC helicopter upkeep and light drivetrain repairs. The 696ZZ marking denotes double metal shields that help exclude debris from the race while keeping friction low for rotating model components.

Application notes: these bearings fit shafts and housings specifying 6 x 15 x 5 mm bearings, commonly used in rotor heads, small gearboxes, and motor shaft supports on electric RC helicopters. Fit them as direct replacements when the original parts share these exact dimensions and shield type.

Installation and tuning notes: press the bearing into the hub or housing using a tube or bearing driver that contacts the outer race only; avoid striking the inner race to prevent damage. Check for smooth free-spin before reassembly. Replacing worn bearings reduces play and vibration, which can improve tail response and rotor smoothness without changing gear ratios or motor timing.

Maintenance tips: store spare bearings clean and, if needed, apply a light model-grade oil. Avoid heavy greases that attract dust, and inspect bearings periodically for lateral play or roughness as a sign they need replacing.