Tailored for high-speed, compact applications requiring robust protection against contaminants, the 604-2RS is a miniature single-row deep groove ball bearing equipped with dual rubber seals. Unlike open or shielded variants, the dual-lip nitrile rubber (2RS) configuration ensures that premium factory grease remains securely locked inside while blocking dirt, dust, and moisture. This makes it an indispensable component for precision devices, small electric motors, and automated systems where longevity and maintenance-free operation are top priorities.