The 300 mm cast iron sleeve bearing designed for use with 6328 series bearings features an approximate outer diameter of 309 mm with a tolerance of ±0.05 mm and a sleeve length of 120 mm. This oversized sleeve bearing provides a durable, precision fit for large deep groove ball bearings, ensuring reliable operation in heavy-duty industrial applications. The 6328 deep groove ball bearing it pairs with has an inner diameter of 140 mm, an outer diameter of 300 mm, and a width of 62 mm, constructed from standard bearing steel with a brass cage and an open design for easy lubrication. It offers slightly increased radial clearance (C3), suitable for high-speed and moderate temperature environments. This combination supports robust performance in large electric motors, pumps, and heavy machinery.