The 6904-2RS is a Double Rubber-Sealed Ultra-Thin Deep Groove Ball Bearing engineered for applications requiring a slender profile along with reliable contamination protection. Fitted with two rubber contact seals (2RS) on both sides, it effectively shields against dust, moisture, and fine particles while maintaining internal lubrication. With a 20 mm bore and a slim 9 mm width, this bearing offers an ideal solution for compact motors, precision equipment, and small devices where space savings and environmental sealing are essential.