The R1-4-ZZ is a specialized, ultra-small single-row deep groove ball bearing engineered for high-precision instruments where space is at an absolute premium. With a bore diameter of precisely 1/8 inch, this micro-bearing is equipped with dual pressed-steel shields (ZZ) that protect the internal raceways from dust and debris ingress. Unlike contact seals, these metallic shields are designed with a minute gap between the shield and the inner ring, ensuring virtually zero frictional resistance. This non-contact architecture allows the R1-4-ZZ to achieve exceptional rotational velocities, making it the ideal choice for high-speed micro-motors and sensitive measuring apparatus.