What is an SFNUR Ball Screw?
The SFNUR Ball Screw is a precision linear motion transmission component designed to convert rotary motion into accurate linear movement. It consists of a ball screw shaft, a flange-type ball nut, and a recirculating ball system that minimizes friction and improves transmission efficiency.
Widely used in CNC machines, industrial automation systems, laser equipment, packaging machinery, semiconductor devices, and robotic applications, the SFNUR series provides reliable positioning accuracy, smooth operation, and long service life. It is an ideal solution for applications that require precise linear motion and efficient power transmission.
Understanding the SFNUR Model Number
One of the first things engineers and purchasing managers look for is the model designation. Understanding the model structure helps simplify selection and replacement.
Take SFNUR1605 as an example:
SFNUR
The letters indicate the ball nut structure.
- SF = Standard Ball Screw Series
- NU = Round Flange Ball Nut Design
- R = Preloaded Type (depending on specification)
This configuration is one of the most commonly used flange-type ball nut structures in industrial automation equipment.
16
Represents the nominal screw diameter.
Unit: millimeters (mm)
Examples:
- 1605 = 16 mm screw diameter
- 2005 = 20 mm screw diameter
- 2505 = 25 mm screw diameter
- 3210 = 32 mm screw diameter
A larger diameter generally provides higher rigidity and load-carrying capacity.
05
Represents the lead of the ball screw.
Unit: millimeters (mm)
The lead refers to the linear distance the nut travels when the screw rotates one complete revolution.
Examples:
- 1605 = 5 mm lead
- 1610 = 10 mm lead
- 2005 = 5 mm lead
- 2010 = 10 mm lead
Higher lead values provide:
- Faster travel speed
- Higher efficiency
- Lower required motor torque
Lower lead values provide:
- Better positioning accuracy
- Higher thrust force
- Improved motion control
Common SFNUR Specifications
Popular models include:
- SFNUR1204
- SFNUR1605
- SFNUR1610
- SFNUR2005
- SFNUR2010
- SFNUR2505
- SFNUR2510
- SFNUR3205
- SFNUR3210
- SFNUR4005
- SFNUR4010
- SFNUR5010
Standard lengths are available from:
- 100 mm
- 300 mm
- 500 mm
- 1000 mm
- 1500 mm
- 2000 mm
- 3000 mm
Custom lengths and end machining are also available according to customer drawings.
Why Choose the SFNUR Ball Screw?
High Precision Motion Control
The SFNUR Ball Screw is designed for applications requiring accurate positioning and repeatability. The rolling ball mechanism significantly reduces friction and backlash compared with conventional lead screws.
This allows machines to achieve consistent movement accuracy and stable performance over long operating periods.
High Transmission Efficiency
Unlike traditional sliding screws, ball screws operate with rolling contact between the balls and raceways.
Transmission efficiency can typically exceed 90%, resulting in:
- Lower power consumption
- Reduced heat generation
- Faster operating speeds
- Improved overall machine efficiency
Excellent Load Capacity
The recirculating ball design distributes loads through multiple contact points, enabling the system to withstand substantial axial forces.
Larger models such as SFNUR3210, SFNUR4010, and SFNUR5010 are particularly suitable for heavy-duty industrial applications requiring increased rigidity and load support.
Long Service Life
Manufactured with hardened steel and precision-ground raceways, SFNUR Ball Screws offer excellent wear resistance and durability.
With proper lubrication and maintenance, they can operate reliably for millions of cycles while maintaining consistent performance.
Smooth and Quiet Operation
The rolling ball mechanism minimizes vibration and operating noise.
Benefits include:
- Reduced machine vibration
- Improved motion smoothness
- Lower operating noise levels
- Enhanced equipment reliability
This makes SFNUR Ball Screws suitable for precision machinery and automated production environments.
High Interchangeability
The SFNUR series follows widely recognized dimensional standards, making it easier to replace or upgrade existing ball screw systems.
This compatibility helps reduce maintenance costs and simplifies machine repairs.
Cost-Effective Solution
Modern manufacturing technology has significantly improved the quality and consistency of ball screw production.
SFNUR Ball Screws offer an excellent balance between performance, reliability, and cost, making them a practical choice for OEM manufacturers, machine builders, and maintenance projects.
Typical Applications
SFNUR Ball Screws are widely used across various industries and automation systems.
CNC Machine Tools
Suitable for:
- CNC machining centers
- Milling machines
- Lathes
- Engraving machines
Providing precise feed motion and positioning control.
Industrial Automation Equipment
Commonly used in:
- Automated assembly lines
- Pick-and-place systems
- Inspection equipment
- Material handling systems
Ensuring stable and repeatable linear motion.
Laser Processing Equipment
Ideal for:
- Laser cutting machines
- Laser welding systems
- Laser marking equipment
Where accurate positioning and smooth movement are essential.
Packaging Machinery
Applied in:
- Labeling machines
- Filling systems
- Packaging lines
To achieve efficient and synchronized motion control.
Electronics and Semiconductor Equipment
Widely used in:
- PCB manufacturing equipment
- SMT machines
- Semiconductor auxiliary systems
Where precision and reliability are critical requirements.
Stock Availability and Custom Services
To meet different project requirements, SFNUR Ball Screws are available in both standard stock configurations and customized solutions.
Available services include:
- Custom screw length cutting
- End machining
- Thread processing
- Keyway machining
- Non-standard customization
- Ball screw support units
- Coupling matching
- OEM and ODM production
Customers can also provide technical drawings for custom manufacturing.
For machine maintenance and upgrades, SFNUR Ball Screws can often be used as replacement solutions for many mainstream brands, helping reduce downtime and procurement costs.
Conclusion
The SFNUR Ball Screw has become one of the most widely used linear motion components in modern industrial automation. With its combination of high precision, excellent efficiency, strong load capacity, smooth operation, and cost-effective performance, it serves as a reliable solution for machine builders and equipment manufacturers worldwide.
Whether for new machine development, automation upgrades, or replacement projects, the SFNUR series offers dependable performance and long-term value for a wide range of industrial applications.