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Inch CTBU Class K 6 1/2” x 9” Railway Bearing Tapered Roller Bearing Units Train Bearing

Train bearing/railway bearing
CTBU Class K 6 1/2” x 9”
Double row taper roller bearing

Inch CTBU Class K 6 1/2” x 9” 157x250x181x160mm 

Railway Bearing Tapered Roller Bearing Units Train Bearing 

Tapered roller bearing units (TBUs) consist of two inner rings with a tapered roller and polymer cage assembly, a common outer ring, a central spacer, two sealing systems and a grease fill. 

The classic TBU for American freight car bogies is designed with inch size dimensions following the standards of the Association of American Railroads (AAR).


For new freight cars with increased cargo, inch size compact tapered roller bearing units (CTBUs) are used. The sealing system of the CTBU consists of two parts: a (stationary) seal that is anchored in the outer ring and a flinger ring that is fitted directly on the inner ring shoulder. This design offers increased reliability.


We offer solutions for a wide range of wheelset designs for all kinds of railway rolling stock. This includes high-speed trains, diesel and electric locomotives, diesel and electrical multiple units, passenger coaches, freight cars and mass transit vehicles like tram cars. 

More Part Nos

CTBU 100 x 175100X175X130X120mm
CTBU 110 x 180110x180x142x142mm
CTBU 130 x 210130x210x148x132mm
CTBU 130 x 220130x220x145x135mm
CTBU 130 x 230130x230x166x150mm
CTBU 130 x 230130x230x176x160mm
CTBU 130 x 240 130x240x172x160mm
CTBU 130 x 250 130x250x172x160mm
CTBU 140 x 220   140x220x150x140mm
Class B 4 1/4” x 8”101.600x165.100x106.35x114.30mm
Class C 5” x 9”119.088x195.263x136.525x142.875mm
Class D 5 1/2” x 10”131.775x207.963x146.75x152.40mm
Class E 6” x 11”144.475x220.663x155.575x163.51mm
Class F 6 1/2” x 12”157.175x252.413x177.80x184.15mm
CTBU Class K 6 1/2” x 9”157x250x181x160mm
CTBU Class G 7” x 9”   178x276x200x186
CTBU Class G 7” x 12”178x276x200x186