Insulated cast iron bearing sleeves are precision-engineered for reliable performance in demanding electrical environments. Designed for use with bearings 6021, 6218, and 6315, these sleeves feature a 160 mm length and an approximate outer diameter of 166.3 mm (6.547 inches), with a tolerance of ±0.05 mm. Constructed from high-quality cast iron with insulation, they prevent electrical current passage, protecting bearings from damage caused by eddy currents and fluting. The robust design ensures durability and optimal fit, making them ideal for industrial motors and machinery requiring electrical isolation and long service life.