The 90 mm insulated cast iron sleeve bearings are designed for use with bearing numbers 6011, 6210, and 6308, featuring an outer diameter of approximately 94 mm (3.701 inches) with a tolerance of ±0.05 mm and sleeve lengths available in 30 mm, 40 mm, or 50 mm. An oversized variant offers a 95 mm outer diameter with a 50 mm length. These sleeves provide electrical insulation to prevent current flow through the bearing, enhancing durability in electric motor applications. The compatible 6308 deep groove ball bearing measures 40 mm inner diameter, 90 mm outer diameter, and 23 mm width, constructed with steel rings and designed for high rotational speeds and dynamic loads, available in open, shielded, or sealed configurations. These components are ideal for industrial machinery requiring reliable electrical isolation and robust mechanical performance. Voltage ratings and capacitance are not specified for these mechanical components as they are primarily bearing sleeves and ball bearings rather than electrical capacitors.