6x12x4mm Ball Bearings Pair BB-126-2 by Yokomo  [BB-126-2]

Precision 6x12x4mm bearings for R/C use

Sold as two 6x12x4mm ball bearings, this item is intended for general R/C maintenance and replacement work. The BB-126-2 code appears on the listing to help you match the correct dimensional specification for hubs, carriers, or other bearing seats.

Always verify inner bore, outer diameter, and the 4mm width of the receiving seat so the 6x12x4mm bearing sits flush and does not foul seals or spacers. These slim bearings are common where a narrow profile is necessary; check housing depths prior to installation to avoid problems.

Install with controlled, even force using appropriate tools to prevent misalignment. Confirm that assemblies spin freely after fitting and that retaining clips and seals are properly seated. Replacing damaged 6x12x4mm bearings often reduces drivetrain drag and improves smoothness.