... ,31311,31312,31313,31314,31315,31316,Double row taper roller bearing:Four row taper roller bearing: Item No.d(mm)D(mm ... equipped individually.On small and medium sized dimensions, our tapered roller bearings use P5 or equivalent techniques; and adopt entire convexity ... , heavy machine tools' main shafts, big power reduction gears, axletree axle boxes, roller wheels of transportation devices, and the ...