The SFU2505 ball screw is a 25mm diameter, 5mm lead precision ball screw designed for CNC machinery, automation equipment, positioning axes, engraving machines, packaging systems, and other medium-load linear motion applications. DLY supplies SFU2505 ball screws in rolled C7 and ground C5 options, with S55C screw shafts, 20CrMo ball nuts, custom screw lengths, and end machining according to customer drawings.
This model is commonly selected when the application requires smoother movement, higher transmission efficiency, compact installation, and stable positioning performance compared with conventional sliding screws.
SFU2505 ball screw with single flanged nut
Nut structure and screw surface detail
Ball screw assembly with support units
SFU2505 Ball Screw Quick Specifications
| Model | SFU2505 | Shaft Diameter | 25 mm |
| Lead | 5 mm | Ball Diameter | 3.175 mm |
| Nut Outer Diameter | 40 mm | Flange Diameter | 63 mm |
| Accuracy Grade | Rolled C7 / Ground C5 | Nut Type | SFU single flanged nut |
| Screw Shaft Material | S55C | Nut Material | 20CrMo |
| Customization | Custom screw length, end machining, nut marking, drawing confirmation, and matching support units are available. | ||
SFU2505 and DFU2505 Nut Dimension Table
| Model | d | Lead | Da | D | A | B | L | W | X | H | Q | N | Ca kgf | Coa kgf | K kgf/μm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SFU2505-3 | 25 | 5 | 3.175 | 40 | 63 | 10 | 43 | 51 | 6.6 | 48 | M6 | 3 | 980 | 2300 | 32 |
| SFU2505-4 | 25 | 5 | 3.175 | 40 | 63 | 10 | 51 | 51 | 6.6 | 48 | M6 | 4 | 1280 | 3110 | 35 |
| DFU2505-3 | 25 | 5 | 3.175 | 40 | 63 | 10 | 86 | 51 | 6.6 | 48 | M6 | 3 | 980 | 2300 | 60 |
| DFU2505-4 | 25 | 5 | 3.175 | 40 | 63 | 10 | 101 | 51 | 6.6 | 48 | M6 | 4 | 1280 | 3110 | 65 |
Unit: mm unless otherwise stated. Ca = basic dynamic load rating. Coa = basic static load rating. K = rigidity value.
Other 2505 Nut Options
In addition to the standard SFU flanged nut, DLY can also provide other 2505 nut structures for different installation spaces and preload requirements. Please confirm the final nut type according to your drawing or machine structure.
| Model | d | Lead | Da | D | A / Thread | B | L | Q | N | Ca kgf | Coa kgf | K kgf/μm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SCM2505-3 | 25 | 5 | 3.175 | 40 / 42 | M40×1.5P | 17 | 50 | M6 | 3 | 980 | 2300 | 32 |
| SCM2505-4 | 25 | 5 | 3.175 | 40 / 42 | M40×1.5P | 17 | 60 | M6 | 4 | 1250 | 3070 | 33 |
| SFA2505-3.8 | 25 | 5 | 3.175 | 40 | 62 | 10 | 33 | M6 | 3.8 × 1 | 1650 | 4658 | 43 |
Why Choose DLY SFU2505 Ball Screw
25mm Diameter, 5mm Lead
A balanced specification for medium-load linear motion, offering stable movement and controlled feed per revolution.
C7 and C5 Options
Rolled C7 is suitable for general automation and CNC use, while ground C5 can be selected for higher positioning requirements.
Custom End Machining
Both screw ends can be machined according to drawings, including bearing seats, coupling ends, threads, keyways, and stepped shafts.
Matching Accessories
Support units, nut housings, motor brackets, and couplings can be supplied together for easier installation and purchasing.
Applications
SFU2505 ball screws are suitable for applications that require smooth linear transmission, moderate load capacity, and stable positioning accuracy.
- CNC routers, engraving machines, milling machines, and light-to-medium machine tools
- Automation positioning axes and linear motion tables
- Packaging machinery, dispensing equipment, and inspection machines
- Industrial actuators, lifting mechanisms, and screw-driven modules
- Custom OEM equipment requiring 25mm ball screw transmission
Customization and Drawing Support
DLY can process SFU2505 ball screws according to customer drawings or installation requirements. Before production, customers can confirm the overall length, thread length, end machining dimensions, nut type, support unit model, and required accuracy grade.
| Screw Length | Cut and processed according to order requirements. |
| End Machining | Bearing seat, thread, keyway, retaining ring groove, coupling end, and other drawing-based structures. |
| Nut Marking | Model marking or logo marking can be arranged when required. |
| Drawing Support | 2D and 3D drawing confirmation can be provided for ball screws, nuts, nut housings, support units, and related accessories. |
Manufacturing and Quality Control
DLY focuses on stable production control for ball screw shafts and nuts, including material selection, heat treatment, thread processing, nut assembly, inspection, and packaging. Each SFU2505 ball screw can be checked before shipment according to order requirements.
- S55C screw shaft and 20CrMo nut material options
- Rolled C7 and ground C5 accuracy options
- Custom end machining based on customer drawings
- Inspection before shipment
- Protective packaging for international shipping
Packaging, Delivery, and Service
SFU2505 ball screws are usually packed with anti-rust protection and reinforced packaging. For sample orders or small quantities, carton packaging can be used; for larger or longer ball screws, wooden case packaging is recommended to reduce transportation damage.
| Delivery Time | Normally 3–15 days depending on stock, machining requirements, and order quantity. |
| Packaging | Anti-rust treatment, protective wrapping, carton or wooden case packaging. |
| Warranty | One-year warranty for manufacturing defects under normal use conditions. |
| Technical Support | Model selection, drawing confirmation, installation matching, and replacement model confirmation are available. |
FAQ
What is the difference between SFU2505-3 and SFU2505-4?
The main difference is the number of ball circuits and related load capacity. SFU2505-4 has a longer nut length and higher load rating than SFU2505-3.
Can DLY machine both ends of the SFU2505 ball screw?
Yes. Both ends can be machined according to your drawing, including bearing seat dimensions, thread, coupling end, keyway, and other installation structures.
Can I choose C7 or C5 accuracy?
Yes. Rolled C7 is commonly used for general CNC and automation applications, while ground C5 can be selected for higher positioning accuracy requirements.
Can you provide matching support units?
Yes. DLY can supply matching support units, nut housings, motor brackets, and couplings according to your installation layout.
What information should I provide for quotation?
Please provide the model, total length, end machining drawing, quantity, accuracy grade, nut type, and whether support units or other accessories are required.
About DLY
Zhejiang DLY Automation Manufacturing Co., Ltd. supplies precision linear motion components including ball screws, ball nuts, linear guideways, linear shafts, support units, linear modules, and related accessories. For SFU2505 ball screw orders, DLY can support drawing confirmation, custom processing, inspection, packaging, and technical communication before shipment.
For SFU2505 model selection, end machining confirmation, or quotation support, please contact DLY with your drawing and quantity.
Need SFU2505 Ball Screw Selection or Drawing Confirmation?
Send us your model, length, end machining drawing, accuracy grade, and quantity. DLY will help confirm the suitable ball screw and matching accessories.
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