The 90 mm steel shaft sleeve bearing compatible with bearing numbers 6018, 6218, and 6318 features a sleeve length of 75 mm, designed for precise fitment with these bearing sizes. These bearings typically have bore diameters of 90 mm (6218), 90 mm (6018), and 90 mm (6318), with outer diameters and widths varying by series, such as 6218 (90×160×38 mm) and 6318 (90×190×43 mm). They are constructed from high-quality chrome steel, offering high toughness and good load-bearing capacity. These deep groove ball bearings support high rotational speeds and are suitable for applications requiring durability and low friction. Sleeve bearings ensure proper shaft alignment and reduce wear in motor and machinery assemblies.