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%
Full Specifications
© RFU Motion. Specifications subject to change without notice.
For the latest specs, please contact us.
Custom Manufacturing Available
Standard ball screws and linear guides don't always fit your design. Here's what RFU MOTION can customize based on your drawings:
- Shaft end machining — machined precisely to your drawing
- Screw length — cut to your exact requirement
- Preload — light, medium, heavy, or custom value
- Nut type — standard flange, special shape, or non-standard mounting interface
- Rail length — continuous cutting with end finishing (chamfer or grinding)
- Mounting holes — special thread sizes, hole spacing, or countersunk dimensions
Send us your drawing or specs — we'll deliver exactly what you need.
📦 MOQ: 1 piece / 1 set
⏱️ Lead time: Standard custom 5-7 days | Complex custom 7-15 days | Wire cutting +2 days
Request Custom Quote →