DFU 4010-4 SHACSHAC DFU 4010 4 Double Ball Nut, 40 mm, 10 mm Lead, CNC Precision Grade The SHAC DFU 4010 4 double ball nut is a heavy duty 40 mm, 10 mm lead nut designed for high speed, high load CNC axes. With its preloaded twin nut construction, it delivers excellent rigidity and backlash control for demanding industrial machines. Although SHAC is manufactured in China, its performance and finish are comparable to well known Taiwanese brands, giving Pakistani