Precision Ground Ball Screw
High-Accuracy Linear Motion for CNC, Automation, and Inspection Equipment
Precision ground ball screws are designed for machines that require stable positioning, low backlash, smooth motion, and reliable repeatability. They are widely used in CNC machines, automation equipment, inspection systems, semiconductor-related machinery, measuring machines, and custom linear motion modules.
Available with C3, C5, C7, and project-based accuracy options, each ball screw can be supplied with matching nuts, preload configuration, custom end machining, support units, and inspection documentation according to the application requirement.
Get Precision Ball Screw Quotation
Product Specifications
| Parameter | Available Options |
|---|---|
| Product Name | Precision Ground Ball Screw |
| Accuracy Grade | C3 / C5 / C7 / Custom |
| Shaft Diameter | 6mm-80mm or customized |
| Lead | 1mm-40mm or customized |
| Nut Type | Flange nut, round nut, single nut, double nut |
| Preload | No preload / light preload / medium preload / custom |
| Material | Bearing steel / alloy steel according to project requirement |
| Surface | Hardened and precision ground |
| End Machining | BK/BF, FK/FF, EK/EF, WBK, or drawing-based |
| Length | Cut to drawing |
| Accessories | Support unit, lock nut, coupling, linear guide |
| MOQ | 1 piece for custom ball screw set |
| Lead Time | Based on specification and quantity |
| Drawing Format | PDF, DWG, STEP, or sample reference |
Accuracy Grade Selection
Choosing the right accuracy grade is not about buying the highest grade blindly. It is about matching the grade to the machine's actual positioning requirement.
| Accuracy Grade | Typical Use | Recommendation |
|---|---|---|
| C7 | General automation, low-cost motion systems | Good for basic positioning |
| C5 | CNC machines, machining centers, industrial automation | Balanced accuracy and cost |
| C3 | Inspection equipment, high-precision machinery, measuring systems | For higher positioning accuracy |
| C1 / C0 | Ultra-precision applications | Project-based evaluation |
For most industrial equipment, C5 is the practical choice. For inspection, measuring, or higher-precision positioning systems, C3 is usually more suitable.
Preload and Backlash Control
For precision equipment, backlash is one of the most important failure points. Backlash may cause positioning error, unstable repeatability, vibration during reversal, poor machining quality, and servo tuning problems.
Our precision ground ball screws can be supplied with preload options to reduce axial play and improve rigidity. Available preload structures include oversized ball preload, double nut preload, spacer preload, and custom preload according to application.
Custom End Machining
A precision ball screw is not complete until the end machining matches the machine structure. We provide end machining according to customer drawing, bearing support unit model, motor coupling requirement, lock nut specification, existing sample, or CNC machine retrofit requirement.
| Fixed Side | Supported Side | Typical Use |
|---|---|---|
| BK | BF | CNC and automation |
| FK | FF | Compact machines |
| EK | EF | Small precision modules |
| WBK | Custom | Heavy-duty or special equipment |
Ground Ball Screws vs. Rolled Ball Screws
| Feature / Aspect | Precision Ground Ball Screw | Rolled Ball Screw |
| Manufacturing Process | Grinding with high-precision equipment | Cold rolling process |
| Accuracy | Lead accuracy up to ±0.018mm/300mm | Lead accuracy typically ±0.05mm/300mm |
| Surface Finish | Very smooth, low friction | Rougher finish, higher friction |
| Rigidity & Stability | Excellent rigidity, stable under heavy loads | Moderate rigidity, suitable for lighter loads |
| Noise & Vibration | Minimal noise, smoother operation | Higher vibration and noise |
| Cost | Higher (premium solution) | More cost-effective |
| Applications | CNC machine tools, aerospace, medical devices, semiconductor equipment | General automation, woodworking, packaging machinery |
FAQ
Q: What is a precision ground ball screw?
A: A precision ground ball screw is a ball screw manufactured by grinding the screw shaft to achieve higher lead accuracy and better motion stability. It is used in machines that require accurate and repeatable linear movement.
Q: What is the difference between C3, C5, and C7 ball screws?
A: C3 has higher accuracy than C5 and C7. C5 is commonly used for CNC and precision automation. C7 is more suitable for general industrial motion.
Q: Is a ground ball screw better than a rolled ball screw?
A: Not always. A ground ball screw is better for precision applications, but it is also more expensive. For general automation, a rolled ball screw may be enough.
Q: Can you make custom end machining?
A: Yes. We can machine the ball screw ends according to your drawing, support unit model, or sample.
Q: Can I order one piece?
A: Yes. MOQ can start from 1 piece for custom ball screw sets, depending on specification.
Q: What information do you need for quotation?
A: Please send diameter, lead, length, accuracy grade, nut type, end machining drawing, quantity, and application.
Need a Precision Ground Ball Screw for Your Machine?
Send us your drawing, model number, or technical requirement. We will help check the suitable accuracy grade, nut type, end machining, lead time, and supply option.
Hot Tags: precision ground ball screw, China precision ground ball screw manufacturers, suppliers, factory, 2500mm ball screw, ball screw 20mm, 25mm ball screw, stainless steel ball screw, ballscrews, ball screw driven nut
