Support base is connected to the bearing, structural and specialty motors for standard screw and ball screw shaft finished goods inventory, prepare a standardized support unit EK, EF based on the general preparation of the standard ball screw support unit BK, BF type . The fixed side support unit fitted with JIS5 level preload adjusting the angular contact ball bearings. Particularly in the ultra-small EK6,8 formula, ultra-small angle fitted to the ball screw developed ultra small contact angle of 45 ° in contact ball bearings, to achieve high rigidity, high precision and stable rotation performance. Support side support unit using deep groove ball bearings. Support unit EK, BK-type internal load bearing right amount of lithium soap grease, sealed with a special gasket, can directly install, long-term use. (1) taking into account the use of the optimum bearing stiffness balance and the ball screw, using the low torque high rigidity angular contact ball bearing (contact angle of 30 °, the free combination). Meanwhile, the ultra-compact support unit EK6,8 ball screw equipped for the development of ultra-small ultra-compact angular contact ball bearings. This bearing contact angle is 45 °, ball diameter is small, the number of balls and more, with high rigidity, high-precision ultra-compact angular contact ball bearings, slewing can get a stable performance. (2) the shape of the support unit and support unit has angle-round series, can be selected according to the application. (3) small in size and easy to install the support unit is considered around the mounting space, the small volume of the design. Meanwhile, adjusted preload loaded bearings can directly be assembled after delivery, which reduces assembly work, but also improve the assembly accuracy