The SFI Series is a precision ball screw with a single nut and internal circulation, featuring a compact flange-type design . This internal return system allows for space-saving installation and smooth, low-noise operation . It offers high rigidity and is available in C3 to C7 precision grades . Common shaft diameters range from 16mm to 80mm with leads of 4, 5, and 10mm . It is ideal for CNC machines, automation equipment, and robotics requiring high accuracy.