Class F Tapered Roller Train Bearing TAROL6-1/2x12-U-JP Railway bearings BT2-8612 BB

AAR freight cars 

The classic TBU design for American freight  cars is following the enveloped size of  Association of American Railroads (AAR)  where initially the tapered roller bearings  replaced plain bearings. This is the reason  for a relatively long axle journal. SKF offers  the inch size TBU design in two versions: • traditional inch size TBU design following  the AAR specification • enhanced inch size TBU design with LL  seals and special material selection for  customers where AAR requirements are  not compulsory For new freight cars with increased cargo,  the inch size compact TBU class K is used.  This SKF design is fitted with LL seals, and a  polymer clip ring and is approved by AAR.

Chinese freight cars 

SKF has developed special TBU designs for  the Chinese freight car bogie designs to  meet the Chinese Railways' standards. This  special design is based on a TBU fitted with  an LL seal on both sides, a polymer spacer  and polymer cages.  These TBU 130 x 230 x 150 are  interchangeable with other TBUs in China. New generations of Chinese freight cars  are designed for 80 t cargo and 120 km/h,  compared to the previous generation of cars  that were designed for 60 t cargo and  80 km/h. To meet these targets and to  further improve operating safety, the  Chinese Ministry of Railways has selected  SKF as a technology partner. The new bogies for freight cars are  equipped with a special execution of  CTBU 150 x 250 x 160 size