DFU Series – Double-Nut Preloaded Ball Screw

The DFU series employs a double-nut with spacer preload structure to achieve zero backlash operation. This series is designed for complete assembly interchangeability with equivalent series from major brands, making it particularly suitable for CNC machine tools, precision positioning stages, Z-axis vertical drives, and other applications demanding high rigidity and high reverse positioning accuracy. Available in C5 and C7 accuracy grades.

Key Features

• Assembly Replacement – Direct replacement of existing same-series assemblies; custom shaft ends per customer drawings
• Zero Backlash – Double-nut preload completely eliminates axial clearance; reverse accuracy up to ±0.003mm (C5)
• 2-3x Rigidity – Significantly enhanced axial stiffness vs. single-nut; superior resistance to cutting force fluctuations
• Customizable Preload – Light, medium, or heavy preload options based on load requirements
• Wear Resistance – Contact stress distributed across both nuts; extends wear life by over 30%

Replacing a ball screw? Model codes do not carry across brands, so see what to specify instead in our ball screw interchange guide.

Full Specifications