The 45 mm steel shaft sleeve bearing is designed for use with bearing numbers 6009, 6209, and 6309, featuring a sleeve length of 50 mm and undersize options of 2 mm (43 mm bore) and 3 mm (42 mm bore). These bearings typically have an inner diameter of 45 mm, outer diameter around 75-100 mm depending on the model, and widths ranging from 16 to 25 mm. The 6309 bearing, for example, measures 45×100×25 mm and supports a dynamic load capacity up to approximately 53.9 kN, offering high durability and longer lifespan. These steel shaft sleeves provide wear resistance and compatibility with deep groove ball bearings for reliable shaft support in various mechanical applications.