Casters ball casters hardware casters screw the present invention relates to a waterproof-type casters including wheel frame, wheels and wheel center axis universal, universal center shaft coupling wheel and wheel support frame and wheel of the universal rotation. screw casters ball casters hardware casters characterized in that: wheel frame including bearing boxes, steering bearings and end caps, end caps and bearings in the box are located ○-ring fit, universal central part of the shaft axis, the next part of the bracket, installed on the steering shaft bearing, fixed bearing in the wheel frame box, frame and wheel connection, the connector including axles, bushings, and bearings in the wheels, bearings, bushings with lip between ring. The utility model with a reasonable compact ministries parts, easy maintenance, no job ran longer operating life, noiseless operation itself, to optimize the working environment, improve the quality of work. Casters ball casters hardware casters screw