... grade; 4. TBI brand quality gurantee. TBI ball screw Ball screw is made of screw, nut and ball. it's function is to ... general machinery, but also in many advanced industries. Rolled ball screw with a motor assembles electrical-mechanical actuator, which is more ... nuts upon customer's requests. We manufactur cold rolled ball screw in large stock, Specification include: 1204, 1604,1605,1610,2004,2005 ...