1.Product Overview The 6303LLB single row deep groove ball bearing adopts double-sided LLB non-contact nitrile rubber labyrinth seals, standard dimension 17×47×14mmNSK. The LLB seal forms micro labyrinth clearance without touching inner raceway, combining ultra-low rotation torque, high limit speed and excellent fine dust blocking capacity. It bears radial load and slight bidirectional axial load, pre-filled long-life lithium lubricating grease, widely used in high-speed