... Two roller screw, even if the narrow shaft diameter of a single size, also can be designed to transmit ... of two ball screws, so that narrow shaft diameter single size as possible in order to achieve the ... noise can be reduced the size of the screw diameter, even when using two, the noise will not ... high speed transmission of up to 120m/min. (shaft diameter 40mm, lead 30mm, speed 4000min) HMD series NSK ...