1. Product Overview 23128.EMW33C3 belongs to double row spherical roller bearing of 231 series. E represents reinforced optimized internal geometry for higher load capacity; M means solid machined brass cage; W33 stands for outer ring with annular lubrication groove and three lubrication holes; C3 is larger-than-standard radial internal clearance. Spherical raceway design provides excellent self-aligning capability to compensate shaft deflection and installation misalignment.