SFU1605 650mm Ball Screw with BK12 BF12 End Supports and 6.35x10mm Coupler $ 214.27 Made of stainless steel material, sturdy and durable. 22. The ball screw has high transmission efficiency and high positioning accuracy. 33. Precision thread design, more wear resistant, greatly extending the life of the ball screw. 44. Small friction, low noise, run smoothly and stably. 55. Widely used for automatic equipment, precision measuring equipment, and other machines that need precision linear movement.