Double-direction thrust ball bearing can carry axial loads in double directions, but it can not carry radial load. Double-direction thrust ball bearings can make an axial location in two directions. Double-direction thrust ball bearings also have planar housing washer and self-aligning seat washer. Generally, planar housing washer cannot allow any angular error, however, when designing bracing structures, a gap of 0.5-1mm between the outer diameter of housing washer and the fitting surface of bearing block can be kept to correct the angular errors, which, would be made when mounting. Self-aligning housing washer need to be ordered and manufactured separately.