6x12x4mm Replacement Bearings (2 pcs) BB-126-2 Yokomo  [BB-126-2]

Compact 6x12x4mm bearings explained

Offered as two 6x12x4mm ball bearings, this item is intended for general replacement and servicing of radio-controlled models. The BB-126-2 code helps confirm dimensional compatibility with hubs, carriers, or other bearing seats.

Prior to installation, confirm the inner bore, outer diameter, and the required 4mm width in the receiving seat so the 6x12x4mm bearings fit without fouling seals or spacers. These low-profile bearings are chosen where narrow width is necessary; always inspect the housing depth before pressing in bearings.

Use even pressure and appropriate pressing tools to fit the bearings squarely and avoid cocking. After installation, check that moving parts rotate freely and that any retaining rings or seals are correctly positioned. New 6x12x4mm bearings can reduce friction and improve drivetrain performance.