The external circulation ball screw belongs to the classic and mature ball circulation structure, mainly relying on the external guide tube on the outside of the nut to achieve steel ball circulation and reflux. Different from the internal circulation structure, the external circulation screw does not require reverse grooves to be machined inside the nut. The structural design is simple, the mass production stability is high, and the specification coverage is extremely wide. It is the mainstream choice for industrial heavy-duty, long stroke, and general automation equipment.
