NACHI ceramic hybrid deep groove ball bearings, such as the SH6-6204ZZEC3 model, feature silicon nitride rolling elements combined with SUJ2 steel races, offering non-conductive properties that eliminate electric arcing and fluting. These bearings are double shielded, pre-filled with Exxon Polyrex® EM grease, and designed for low temperature rise at high speeds. The SH6-6204ZZEC3 has a 20mm inner diameter, 47mm outer diameter, and 14mm width, making it dimensionally interchangeable with standard electric motor bearings without requiring modifications. These bearings provide enhanced durability and electrical insulation for demanding industrial applications. Voltage ratings are not typically specified for bearings but their insulation prevents electrical damage.