Full definition
Bearing with chrome steel rings (100Cr6) and silicon nitride (Si₃N₄) rolling elements. Advantages over all-steel: natural electrical insulation (prevents fluting), 40% lower density (reduced centrifugal force), higher hardness (1,500 vs 750 HV), lower thermal expansion coefficient. Allows 20–30% higher speeds. Applications: high-speed CNC spindles (>30,000 RPM), VFD motors. ISO 15 standard. Brands: SKF, NSK, FAG, Barden.