Introduction
Double Nut Ball Screw is a high-precision, high-rigidity linear motion component. The dual-nut preloading structure eliminates axial backlash, significantly enhancing transmission accuracy and system rigidity. It converts rotational motion into linear motion through ball circulation, achieving low friction and high efficiency. Widely used in CNC machines, automation equipment, semiconductor manufacturing, and other industries.
product highlights
1. High Precision Positioning
Dual-nut preloading design ensures repeat positioning accuracy up to ±0.005mm, eliminating backlash.
Grinding-grade accuracy (C3/C5 class) for precision machining.
2. High Rigidity & Load Capacity
Axial rigidity increased by 2-3 times with dual-nut structure5, dynamic load capacity up to 125kN3.
Suitable for heavy-duty applications like machine tool feed systems and industrial robots.
3. Long Service Life & Low Maintenance
High-hardness alloy steel (HRC58-62) ensures service life up to 12,000 hours.
Built-in dust-proof seals (e.g., NSK K1™ technology27) reduce contamination.
4. Efficient Transmission
Transmission efficiency up to 90%-96%6, driving torque only 1/3 of sliding screws.
Supports high-speed operation with maximum linear speed of 60m/min.
Specification Parameters
Application Scenarios
Machining Industry
Operation Notes
1. Installation：
Double nut ball screw Ensure parallelism between support seats and guides ≤0.02mm.
Use torque wrench for standard preload installation.
2. Lubrication：
Refill lithium-based grease (ISO VG68) every 500 hours.
Filter lubricating oil regularly to avoid contamination.
3. Maintenance：
Check backlash every 2000 hours (using dial indicator).
Inspect dust cover seals to prevent debris entry.
FAQ
Q1：What's the difference between double nut and single nut?
A：Double nut eliminates backlash through preloading, offering higher rigidity (2-3 times of single nut)5, suitable for high-precision and heavy-load applications; single nut is cost-effective for light-load, low-precision needs.
Q2：How to choose accuracy class?
A：C3 for precision machining (e.g., mold manufacturing), C5 for general industrial equipment, C7 for ordinary automation machinery.
Q3：What factors affect service life?
A：Load, speed, lubrication, and environmental cleanliness. Regular maintenance is recommended to extend lifespan.
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