Yokomo BB-126-4 6x12x4mm Bearing 4 pcs for RC  [BB-126-4]

6x12x4mm compact bearings for model RC assemblies

The Yokomo BB-126-4 unit includes four 6x12x4mm steel ball bearings intended for use in standard RC applications. They are suitable for wheel bearings, differential and gearbox mounts, and motor shaft positions on electric models. Supplied as 4 pcs so you can service several mounting points in one go.

These bearings lower rotational friction, help maintain correct shaft alignment and reduce wear between interfacing parts. Installing fresh bearings typically yields smoother drivetrain rotation and crisper throttle response without changing setup geometry or electronics.

Fitting notes: ensure the 6mm inner bore matches the shaft and the 12mm outer race fits the housing before pressing. Use a tool that contacts the outer race when pressing to avoid inner-race damage, and confirm endplay after assembly. Do not force bearings into incorrect bores and use light grease or bearing oil as appropriate.

Care recommendations: inspect for noise, roughness or play; clean bearings with a suitable solvent if contaminated and relubricate with a low-viscosity oil to restore free spinning. Replace bearings that exhibit pitting, excessive movement or overheating during normal running.