The R133-ZZ is an ultra-miniature, inch-series deep groove ball bearing meticulously crafted for high-frequency rotation in severely space-constrained environments. Measuring a mere 3/32" in inner diameter, this micro bearing features twin pressed-steel shields (ZZ) that deliver exceptional defense against microscopic dust and particulates. Because these metal shields are entirely non-contact, they eliminate the drag and torque spikes commonly associated with rubber seals. This frictionless architecture guarantees smooth, high-velocity operation and superb grease retention, making the R133-ZZ a vital structural component for sensitive instrumentation and ultra-compact mechanisms.