The 623-ZZ is an ultra-compact, high-precision miniature ball bearing engineered for micro-mechanical systems where space is strictly limited but high-speed performance is essential. Outfitted with twin pressed steel shields (ZZ) to safely retain high-grade lubricant and deflect micro-debris, this bearing delivers exceptionally low rotational resistance. With a tiny 3mm bore, a 10mm outer diameter, and a 4mm width, the 623-ZZ is the definitive solution for 3D printer extruders, micro-scale drone motors, and delicate instrumentation requiring frictionless, ultra-smooth movement.