Motor Bearing Selection Guide

  If you’ve ever ordered deep groove ball bearings for electric motors, you’ve probably stared at the product list and wondered: should I go with ZZ or 2RS? It looks like a small detail. But get it wrong, and you might end up with noisy motors, failed seals, or bearings that overheat.    Over the years at Welink Bearing, we’ve helped quite a few customers walk through this decision. So let me share what we’ve learned, straight from our grinding lines and assembly workshops.   First, what’s the real difference? • ZZ bearings come with metal shields(usually steel) on both sides. They’re non-contact seals, meaning they don’t rub against the inner ring. • 2RS bearings have contact rubber seals on both sides. The rubber li...