Full definition
Bearing with thermally stabilized rings preventing dimensional changes from retained austenite transformation at elevated temperatures. Stabilization classes: S0 (up to 150°C), S1 (up to 200°C), S2 (up to 250°C), S3/S4 (up to 300°C). Also requires steel or brass cage (no polyamide) and high-temperature grease (polyurea NLGI 2, synthetic VG 150+ base oil). Applications: industrial ovens, dryers, sterilizers. ISO 15 standard. Brands: SKF, FAG, NSK.