Product Details:
DLY SFH nuts are flange-type ball screw nuts designed for precision linear transmission systems that require smooth movement, stable rigidity and reliable operation under repeated motion. They are used with matching ball screw shafts to convert rotary motion into linear motion for CNC machines, automation equipment, linear modules, electronic manufacturing equipment and other mechanical feed systems.
Compared with standard SFU nuts, SFH nuts are more focused on high-speed movement, dust protection and stable ball circulation. The end-cap circulation structure guides the steel balls through a controlled return path, helping reduce vibration and operating noise during fast feed movement.
SFH models cover compact and medium-size specifications such as SFH1210, SFH1605, SFH1610, SFH1616, SFH2020, SFH2525, SFH3210, SFH3220, SFH4010 and SFH5020. Different lead options support different speed and positioning requirements, while the flange structure provides a direct mounting interface for worktables, brackets, sliders and actuator assemblies.
For replacement and machine maintenance, SFH nuts should be selected according to the screw diameter, lead, nut outer diameter, nut length, flange dimensions, ball diameter, load rating, rigidity and available installation space. DLY can supply SFH nuts together with matching ball screw shafts, end machining and support units according to drawings or samples.
Product Parameters
DLY SFH ball screw nuts are available in multiple screw diameters and lead combinations for compact feed axes, high-speed motion systems and precision positioning structures. The specification data includes screw diameter, lead, helix angle, nut middle diameter, nut outer diameter, steel ball diameter and wall thickness values for dimensional matching.
SFH Series Basic Dimension Specifications
Unit: mm
| Model | Outer Diameter of Screw Rod | Lead | Spiral Lift Angle | Nut Middle Diameter | Outer Diameter of Nut | Nut Steel Ball | Nut Wall Thickness | Nut Wall Thickness II |
|---|---|---|---|---|---|---|---|---|
| SFH1210 | 12 | 10 | 14.539 | 12.28 | 24 | 2.5 | 7.11 | 7.54 |
| SFH1605 | 15 | 5 | 5.824 | 15.672 | 28 | 2.778 | 7.55 | 7.98 |
| SFH1610 | 15 | 10 | 11.487 | 15.672 | 28 | 2.778 | 7.55 | 7.98 |
| SFH1616 | 15 | 16 | 18.010 | 15.672 | 28 | 2.778 | 7.55 | 7.98 |
| SFH1620 | 15 | 20 | 22.130 | 15.662 | 28 | 2.778 | 7.56 | 7.98 |
| SFH2020 | 20 | 20 | 17.041 | 20.72 | 36 | 3.175 | 9.23 | 9.66 |
| SFH2525 | 25 | 25 | 16.977 | 26.08 | 40 | 3.175 | 8.55 | 8.97 |
| SFH3210 | 31 | 10 | 5.617 | 32.381 | 50 | 3.969 | 10.79 | 11.21 |
| SFH3220 | 31 | 20 | 11.145 | 32.331 | 50 | 3.969 | 10.82 | 11.24 |
| SFH3232 | 31 | 32 | 17.485 | 32.351 | 50 | 3.969 | 10.81 | 11.23 |
| SFH3220 | 32 | 20 | 10.860 | 33.2 | 50 | 3.969 | 10.38 | 10.81 |
| SFH4010 | 38 | 10 | 4.600 | 39.555 | 63 | 6.35 | 14.90 | 15.32 |
| SFSH4020 | 38 | 20 | 9.167 | 39.47 | 63 | 6.35 | 14.94 | 15.37 |
| SFH5020 | 48 | 20 | 7.238 | 56.15 | 75 | 6.35 | 15.60 | 16.03 |
The SFH series also includes load-rated models for standard feed transmission. Dynamic load rating, static load rating and rigidity values help match the nut to the expected axial load, duty cycle and positioning requirement.
SFH Series Load Rating Reference
Unit: mm
| Model | Shaft Diameter d | Lead l | Steel Ball Diameter Da | Nut Outer Diameter D | Nut Length L | Dynamic Rated Load Ca | Static Load Rating Coa | Rigidity kgf/μm |
|---|---|---|---|---|---|---|---|---|
| SFH01205-2.8 | 12 | 5 | 2.5 | 24 | 40 | 661 | 1316 | 19 |
| SFH01605-3.8 | 15 | 5 | 2.8 | 28 | 48 | 1112 | 2507 | 30 |
| SFH02005-3.8 | 20 | 5 | 3.2 | 36 | 58 | 1484 | 3681 | 37 |
| SFH02505-3.8 | 25 | 5 | 3.2 | 40 | 62 | 1650 | 4658 | 43 |
| SFH03205-3.8 | 32 | 5 | 3.2 | 50 | 80 | 1839 | 6026 | 51 |
| SFH04005-3.8 | 40 | 5 | 3.2 | 63 | 93 | 2018 | 7589 | 60 |
| SFH05005-3.8 | 50 | 5 | 3.2 | 75 | 110 | 2207 | 9542 | 68 |
Ca refers to the basic dynamic load rating, Coa refers to the basic static load rating, and rigidity values are used for evaluating transmission stiffness. For replacement projects, DLY can match the nut according to the original model, screw shaft size, sample or drawing.
FAQ
Q: What is an SFH ball screw nut?
A: An SFH ball screw nut is a flange-type nut used with a matching ball screw shaft. It converts rotary motion into linear motion and is suitable for precision feed systems, automation equipment, CNC machines and linear modules.
Q: What is the main advantage of SFH nuts?
A: SFH nuts are designed for high-speed movement, smooth ball circulation and better dust protection. They are suitable for applications where low noise, stable rigidity and reliable motion are required.
Q: What is the difference between SFH nuts and SFU nuts?
A: SFU nuts are common standard flange ball screw nuts, often used in compact and general-purpose linear motion systems. SFH nuts focus more on end-cap circulation, high-speed operation and dust protection, making them suitable for faster or more demanding equipment.
Q: What is the difference between SFH nuts and SFA nuts?
A: SFH and SFA nuts are both used in precision ball screw systems, but their flange structure, circulation form and dimensional layout may be different. SFA models are often selected for high-speed and large-lead applications, while SFH nuts are commonly used where high-speed operation and dust protection are both important. Replacement should be confirmed by model, drawing and mounting dimensions.
Q: Can SFH nuts be used in dusty environments?
A: Yes. SFH nuts include dust-protection components that help reduce the entry of particles into the raceway. For woodworking, cutting, printing or other dusty environments, external protection, regular cleaning and proper lubrication are also recommended.
Q: How do I choose the right SFH model?
A: The model should be selected according to screw diameter, lead, stroke, axial load, speed, accuracy requirement, installation direction, nut length, flange dimensions and available space. For replacement projects, the original model number, drawing, sample photos and screw shaft condition are useful for confirmation.
Q: Can DLY supply SFH nuts with matching ball screw shafts?
A: Yes. DLY can supply SFH nuts together with matching ball screw shafts, end machining and support units according to machine drawings, samples or application requirements.
Need Help Selecting an SFH Ball Screw Nut?
Send DLY your required screw diameter, lead, stroke, load, speed, installation space or existing drawing. Our team can help confirm the suitable SFH nut model and matching ball screw assembly for your equipment.
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