SFU Series – Standard Single-Nut Ball Screw
The SFU series is our most widely produced and extensively applied standard ball screw, featuring a single-nut, external recirculation tube design. This series is designed for complete assembly interchangeability with equivalent series from brands such as THK, HIWIN, and ABBA. Available in C5 (precision grade) and C7 (general grade) accuracy levels, it suits the majority of applications including automation, 3C electronics, and general machinery.
Key Features
- Assembly Replacement – Direct replacement of existing same-series assemblies; custom shaft ends per customer drawings
- Single-Nut Design – Compact structure with low frictional torque for medium-light loads and high speed
- External Recirculation – Smooth ball return, excellent temperature control, long-term stability
- Dual Accuracy Grades – C5 for precision positioning; C7 for general transmission; flexible cost-performance
- Noise Optimized – Specially tuned ball matching and return channels for lower noise than peers
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 →