The 623 ZZ is a Premium Ultra-Thin Miniature Deep Groove Ball Bearing engineered for applications demanding minimal axial space. Featuring double metal shields (ZZ) on both sides, this metric bearing provides effective protection against dust while maintaining an exceptionally slim profile. With a 3mm bore, it is ideal for micro-motors, compact mechanisms, optical devices, and other precision instruments where radial space is available but thickness is severely constrained.