High Precision Linear Rails Description
High Precision Linear Rails are used when a machine needs more than simple linear guidance. In precision equipment, the guide rail must control running parallelism, height consistency, straightness, preload stability and smooth ball circulation, so the moving part can maintain accurate and repeatable linear travel.
DLY supplies high precision linear rails in C, H, P, SP and UP accuracy grades for different positioning, repeatability and motion stability requirements. Rail size, block type, preload, accuracy grade and rail length can be selected according to the machine structure, load direction and required motion performance.
Accuracy Grades Explained
- C Grade (Standard Precision)
Suitable for general automation and handling systems with stable performance requirements.
- H Grade (High Precision)
Improved running accuracy and consistency, widely used in CNC machines and industrial automation.
- P Grade (Precision)
Designed for higher positioning accuracy and smoother motion control.
- UP Grade (Ultra Precision)
Ideal for high-speed, high-accuracy applications requiring excellent repeatability.
- SP Grade (Super Precision)
Used in ultra-precision machinery where minimal deviation and maximum rigidity are critical.
Running Parallelism Reference Table
Running parallelism is one of the key indicators for high precision linear rails. The longer the rail, the more difficult it is to maintain very small deviation. This is why rail length and accuracy grade should be confirmed together before ordering.
| Linear Rail Length (mm) | Running Parallelism (µm) | ||||
| C | H | P | SP | UP | |
| 0-315 | 9 | 6 | 3 | 2 | 1.5 |
| 315-399 | 11 | 8 | 4 | 2 | 1.5 |
| 400-499 | 13 | 9 | 5 | 2 | 1.5 |
| 500-629 | 16 | 11 | 6 | 2.5 | 1.5 |
| 630-799 | 18 | 12 | 7 | 3 | 2 |
| 800-1000 | 20 | 14 | 8 | 4 | 2 |
| 1001-1247 | 22 | 16 | 10 | 5 | 2.5 |
| 1250-1599 | 25 | 18 | 11 | 6 | 3 |
| 1600-1999 | 28 | 20 | 13 | 7 | 3.5 |
| 2000-2499 | 30 | 22 | 15 | 8 | 4 |
| 2500-2999 | 32 | 24 | 16 | 9 | 4.5 |
| 3000-3499 | 33 | 25 | 17 | 11 | 5 |
| 3500-4000 | 34 | 28 | 18 | 12 | 6 |
The final motion accuracy also depends on installation surface flatness, rail alignment, screw tightening sequence and machine frame rigidity.
High Precision Linear Rail Inspection Equipment
High precision linear rails need inspection equipment that can verify running accuracy, height consistency and parallelism. DLY uses dedicated inspection systems to check key accuracy parameters before delivery, helping ensure that the rail and block set matches the selected precision grade.
For projects using multiple blocks or paired rails, inspection consistency is especially important. Height difference, preload deviation and rail parallelism can affect smoothness, rigidity and long-term positioning stability.
Production Process Behind High Precision Rails
The accuracy of a linear rail is created through the entire production process. Material stability, heat treatment, rail grinding, groove grinding, straightening, block machining and assembly all affect the final running performance.
Rail Manufacturing Process
Rail production includes raw material inspection, heat treatment, rough straightening, hole machining, cutting, surface grinding, groove grinding, precision straightening and cleaning. Each step affects straightness, raceway accuracy and final running parallelism.
Slider Manufacturing Process
Slider production includes block machining, heat treatment, surface grinding, groove grinding, ball circulation adjustment and final assembly. Accurate groove geometry and preload matching help the slider run smoothly on the rail.
Three-Surface Grinding Machine for High Precision Linear Rail
DLY has introduced advanced three-surface grinding machines, further ensuring the high precision of our linear rails.
These state-of-the-art grinders allow us to achieve tighter tolerances, superior straightness, and improved surface finish, supporting our ability to deliver High Precision Linear Rails from C grade to UP grade.
Available High Precision Linear Rail Models
DLY supplies high precision linear rails in different series and rail sizes. ED series is suitable for lower-profile installation, while HD series is commonly used for standard and higher-rigidity linear motion structures. The final model should be confirmed according to rail size, block type, load direction, accuracy grade and installation space.
How to Order High Precision Linear Rails from DLY
- Inquiry & Consultation – Contact our sales team with your required rail size, accuracy grade (C, H, P, UP, SP), and quantity. We provide technical guidance to ensure the best solution.
- Quotation & Confirmation – Receive a detailed quotation including price, lead time, and specifications. Confirm the order to proceed.
- Production & Quality Control – DLY manufactures the rails and sliders under strict precision control, using advanced grinding, straightening, and inspection equipment.
- Final Inspection & Packing – Each set undergoes thorough testing for straightness, parallelism, and smooth motion before secure packaging.
- Shipping & Support – Fast, reliable delivery with tracking, and after-sales support to ensure your satisfaction.
With this streamlined process, DLY guarantees that every High Precision Linear Rail meets the specified tolerance and performs reliably in your application.
Why Choose DLY
With over 20 years of experience and our own factory, DLY has built a strong foundation in manufacturing High Precision Linear Rails. We are equipped with advanced production and inspection equipment, including slider precision testing machines, three-surface grinding machines, and other state-of-the-art machinery. This allows us to maintain tight tolerances, ensure stable accuracy, and deliver consistent, high-quality linear rails for demanding industrial applications.
FAQ – High Precision Linear Rails
Q: 1. What accuracy grades of linear rails do you offer?
A: DLY offers High Precision Linear Rails from C grade up to SP grade, including C, H, P, UP, and SP. We can provide the right precision level to meet your application requirements, from general automation to high-end CNC machinery.
Q: 2. How do you ensure the precision of your linear rails?
A: Every step of our production process is strictly controlled. From raw material inspection, rail and slider heat treatment, precision grinding, to assembly and final inspection, we maintain micron-level straightness, parallelism, and smooth motion.
Q: 3. Do you manufacture the rails and sliders in-house?
A: Yes, DLY has its own factory with over 20 years of experience. All rails and sliders are produced in-house, using advanced equipment such as slider precision inspection machines and three-surface grinding machines, ensuring consistent high precision.
Q: 4. Can I order a custom size or length of linear rail?
A: Absolutely. DLY can manufacture linear rails in various lengths, sizes, and accuracy grades according to your specifications. Contact our sales team for a customized solution.
Q: 5. What is the lead time for High Precision Linear Rails?
A: Lead time depends on the grade, size, and order quantity. Typically, standard grades can be shipped faster, while high grades (UP/SP) may require more time for precision manufacturing and inspection. Contact us for exact lead time.
Q: 6. How are your products packaged for shipping?
A: All linear rails are carefully cleaned, treated with anti-rust measures, and securely packaged to protect precision surfaces during transit. Bulk or custom packaging is also available.
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