The R1-5-ZZ is an imperial sub-miniature deep groove ball bearing specifically developed for high-precision instruments where space is extremely limited and low rotational torque is a priority. Featuring an inner diameter of 5/32 inches, this bearing is equipped with dual metallic shields (ZZ) to protect the internal raceways from fine dust and particles. Unlike contact seals, these shields operate without touching the inner ring, effectively eliminating friction drag. This makes the R1-5-ZZ an ideal selection for sensitive micro-mechanisms requiring fluid, high-frequency rotation and long-term reliability.