SKF pillow block roller bearing units consist of a spherical or tapered roller bearing mounted in a non-split housing that can be bolted to a support surface. The units are sealed and lubricated and ready to use. This assortment of units covers a wide range of requirements. Metric series units comply with ISO 113 boundary dimensions. Inch series units are not standardized, but SKF roller bearing units are dimensionally interchangeable with most common designs in the marketplace.