The 603-2RS is a Miniature Deep Groove Ball Bearing designed for high-precision applications where space is extremely limited and reliable sealing is critical. Featuring double rubber contact seals (2RS) , this variant provides superior protection against moisture, dust, and fine particulate contamination. With a tiny 3 mm bore, a 9 mm outer diameter, and a 5 mm width, it is the ideal choice for compact rotary assemblies requiring maintenance-free operation and low frictional torque.