DFU 1605-4 SHACSHAC DFU 1605 4 Double Ball Nut, 16 mm, 5 mm Lead, Compact CNC Nut The SHAC DFU 1605 4 double ball nut is a compact 16 mm, 5 mm lead nut for small CNC routers, engraving machines, and automation stages that still require high precision. Its preloaded twin nut construction keeps backlash low and improves stiffness compared with single nut designs. SHAC is produced in China but offers performance similar to Taiwanese brands, giving a clear upgrade over
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