Screw down roller thrust bearing
RKB Europe

RKB screw down bearings are generally single-direction full complement taper roller thrust bearings that must be able to accommodate extremely heavy axial loads at low speeds and also permit angular movement of the screw spindle with respect to the support.
Screw down bearings are frequently mounted between the pressure spindle and the upper chock in rolling mill stands and they have extremely long rollers of large diameter.
In order to be able to accommodate the alignment movements of the chock without affecting the bearing's performance, the bearings have one sphered washer. This may be either the shaft washer or the housing washer.
The necessary alignment movements take place in bearings having a sphered shaft washer above the roller complement between the sphered shaft washer and a correspondingly concave sphered screw spindle or pressure plate.
Where the housing washer is sphered, the alignment movements are accommodated below the roller complement between the housing washer and the pressure plate.
Due to their low friction, these bearings reduce the screw-down forces. This is particularly advantageous in large stands and in stands where the thickness of the rolled material changes frequently.