130x230x150mm 197726 For Various Rail Transit Vehicles Subways And Light Rails

Design features 

Bearing steel Tapered roller bearing units were originally  developed in the 1950s for American freight  cars to substitute plain bearings. The  Association of American Railroads (AAR) has  standardized these bearings for adapter  applications and requires case carburized  steel for inner and outer rings as well as  rollers. SKF offers a special assortment of  inch size TBUs which comply exactly with  the AAR specifications. For high-speed and very high-speed  applications, both case carburized and  through hardened steel is used, depending  on the application requirements.