The self-aligning roller thrust bearing is just like the self-aligning roller bearing.The raceway surface of housing washer is a spherial surface focused on the points of central axis,so the rollers of such bearings are of spherical shape and have the self-aligning function,Besides ,they're not so sensitive to coaxiality and shaft deflection.Different from other thrust bearings in the sample,these bearings can withstand extremely high axial load and can meanwhile withstand much radial load,but the radial load cannot exceed 55%of axial load.So long as the load P and PO does not exceed 0.05%and the shaft washer rotates ,the aligning angles specified in the following table are permitted for such bearings.