SFU 2510-4 SHACSHAC SFU 2510 4 Standard Ball Nut, 25 mm, 10 mm Lead The SHAC SFU 2510 4 standard ball nut is a 25 mm diameter, 10 mm lead nut for medium speed CNC axes that need good load capacity with moderate feed rates. Its single nut construction provides efficient, smooth motion for a wide range of industrial machines. SHAC is produced in China but engineered to compete directly with Taiwanese linear motion brands, offering noticeably higher running quality