Introduction
The SFI Nut is a core component in ball screw drive systems. It is a four-hole flange type single nut with internal circulation, where steel balls circulate across the screw thread peaks via a recirculator to achieve continuous motion, efficiently converting rotational motion into linear motion or vice versa. It is made from high-quality materials such as SCM415, with a surface treated for high strength, and paired with SUJ2 steel balls with a hardness of 58-62 HRC. It features high precision (grades C3-C7), high rigidity, and strong load capacity. Its closed structure and dust-proof design prevent contamination, significantly enhancing wear resistance and service life. The standardized design makes installation and maintenance more convenient, compatible with diameters of 16-80mm and pitches of 4-10mm, capable of high-speed feeds and precise micro-feeds.
Product Parameters
The core parameters of the SFI Nut focus on structural design, performance indicators, and compatibility features. Structurally, it is clearly defined as a four-hole flange type single nut with an internal circulation design, where steel balls are guided by the recirculator to move diagonally across the screw thread peaks. Performance parameters cover precision grade, material hardness, load capacity, rigidity, and wear resistance, achieved through high-quality base materials and professional heat treatment processes, along with sealing and dust-proof design standards. Compatibility parameters involve matching screw diameters and pitches, support for custom thread directions and preload adjustments, and adherence to standardized installation dimensions and maintenance guidelines, ensuring compatibility and ease of assembly with various drive systems.
|
d：Shaft diameter |
I：Lead |
Da：Bead diameter |
k:Rigidity |
n:Number of steel ball turns |
|||||||||||
|
ca:Basic dynamic load rating(kgf) |
coa：Basic static rated load(kgf) |
unit：mm |
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|
Model |
d |
l |
Da |
Nut size |
Ca |
C0a |
k |
||||||||
|
D |
A |
B |
L |
W |
H |
X |
Q |
n |
|||||||
|
SFU01204-4 |
12 |
4 |
2.5 |
24 |
40 |
10 |
40 |
32 |
30 |
4.5 |
1×4 |
902 |
1884 |
26 |
|
|
SFU01604-4 |
16 |
4 |
2.381 |
28 |
48 |
10 |
40 |
38 |
40 |
5.5 |
M6 |
1×4 |
973 |
2406 |
32 |
|
SFU01605-4 |
5 |
3.175 |
28 |
48 |
10 |
50 |
38 |
40 |
5.5 |
M6 |
1×4 |
1380 |
3052 |
32 |
|
|
SFU01610-3 |
10 |
3.175 |
28 |
48 |
10 |
57 |
38 |
40 |
5.5 |
M6 |
1×3 |
1103 |
2401 |
26 |
|
|
SFU02004-4 |
20 |
4 |
2.381 |
36 |
58 |
10 |
42 |
47 |
44 |
6.6 |
M6 |
1×4 |
1066 |
2987 |
38 |
|
SFU02005-4 |
5 |
3.175 |
36 |
58 |
10 |
51 |
47 |
44 |
6.6 |
M6 |
1×4 |
1551 |
3875 |
39 |
|
|
SFU02504-4 |
25 |
4 |
2.381 |
40 |
62 |
10 |
42 |
51 |
48 |
6.6 |
M6 |
1×4 |
1180 |
3795 |
43 |
|
SFU02505-4 |
5 |
3.175 |
40 |
62 |
10 |
51 |
51 |
48 |
6.6 |
M6 |
1×4 |
1724 |
4904 |
45 |
|
|
SFU02510-4 |
10 |
4.762 |
40 |
62 |
12 |
85 |
51 |
48 |
6.6 |
M6 |
1×4 |
2954 |
7295 |
50 |
|
|
SFU03204-4 |
32 |
4 |
2.381 |
50 |
80 |
12 |
44 |
65 |
62 |
9 |
M6 |
1×4 |
1296 |
4838 |
51 |
|
SFU03205-4 |
5 |
3.175 |
50 |
80 |
12 |
52 |
65 |
62 |
9 |
M6 |
1×4 |
1922 |
6343 |
54 |
|
|
SFU03210-4 |
10 |
6.35 |
50 |
80 |
12 |
90 |
65 |
62 |
9 |
M6 |
1×4 |
4805 |
12208 |
61 |
|
|
SFU04005-4 |
40 |
5 |
3.175 |
63 |
93 |
14 |
55 |
78 |
70 |
9 |
M8 |
1×4 |
2110 |
7988 |
63 |
|
SFU04010-4 |
10 |
6.35 |
63 |
93 |
14 |
93 |
78 |
70 |
9 |
M8 |
1×4 |
5399 |
15500 |
73 |
|
|
SFU05010-4 |
50 |
10 |
6.35 |
75 |
110 |
16 |
93 |
93 |
85 |
11 |
M8 |
1×4 |
6004 |
19614 |
85 |
|
SFU06310-4 |
63 |
10 |
6.35 |
90 |
125 |
18 |
98 |
108 |
95 |
11 |
M8 |
1×4 |
6719 |
25358 |
99 |
|
SFU06320-4 |
20 |
9.525 |
95 |
135 |
20 |
149 |
115 |
100 |
13.5 |
M8 |
1×4 |
11444 |
36653 |
112 |
|
|
SFU08010-4 |
80 |
10 |
6.35 |
105 |
145 |
20 |
98 |
125 |
110 |
13.5 |
M8 |
1×4 |
7346 |
31953 |
109 |
|
SFU08020-4 |
20 |
9.525 |
125 |
165 |
25 |
154 |
145 |
130 |
13.5 |
M8 |
1×4 |
12911 |
47747 |
138 |
|
Core Advantages
1. The most prominent advantage of SFI nuts is their high transmission efficiency. They transmit power through steel balls rolling in the screw and nut raceways, unlike traditional sliding nuts which have significant friction resistance. A smaller motor can drive a heavier load, making the equipment more energy-efficient during operation, and enabling high-speed feeding, which is especially suitable for automated equipment that requires high operational speeds.
2. Precision positioning is another major highlight of SFI nuts. Whether it's the accuracy of a single position or the consistency of repeated positioning, both can reach a very high standard. Axial play can be eliminated through preload adjustment, so the equipment won't wobble at startup and won't crawl in a jerky manner at low speeds, fully meeting the micro-feed requirements of precision machine tools and testing instruments.
3. Their rigidity and load capacity are also reliable. High-quality steel is used, combined with professional heat treatment processes, ensuring overall hardness and strength. Paired with bearing-grade steel balls, they can handle heavy-duty conditions like machine tool cutting without easily deforming, providing solid support for stable equipment operation.
4. SFI nuts are also durable and highly adaptable to different environments. The enclosed structure blocks dust, metal chips, and other debris, preventing wear inside the raceways and on the steel balls. Additionally, the raceway surface is precisely ground for improved wear resistance, allowing long-term operation even in dusty workshop conditions, significantly extending service life and reducing equipment downtime for maintenance.
5. Finally, installation and compatibility are particularly convenient. The four-hole flange design allows for direct bolting, making assembly quick and easy. They are compatible with various specifications of ball screws and support customized thread directions, enabling easy integration into different transmission systems, whether for machine tool upgrades or new equipment development, offering strong versatility.
Scope of Application: Widely used in machine tools, automation equipment, CNC machinery, printing machines, and other industrial settings, capable of operating reliably even in contaminated environments.
Service Model
Standard Product Supply:
Offers in-stock products with delivery within 3-7 days;
Custom Solutions:
From requirement communication → solution design → sample testing → mass production, the entire process is supported by a dedicated technical contact;
After-Sales Support:
Provides product installation guidance, a 1-year warranty (excluding human-caused damage), and fast response to malfunctions.
Our Factory
Xuxin Automation: Your Premier One-Stop Manufacturer for High-Precision Motion Components
we specialize in the R&D and manufacturing of custom non-standard lead screws and nuts. With our 13,000 m² state-of-the-art facility, we deliver highly reliable industrial automation solutions tailored to your exacting requirements.
Production Area
Advanced Equipment
Experienced Team
Annual Output
Why Choose Us?
Exceptional Non-Standard Customization Capabilities
In-house R&D: Our professional engineering team possesses decades of deep-seated expertise in the lead screw and nut industry.
On-Demand Development: Whether you require specialized leads, unique materials, or complex structures, we provide bespoke manufacturing based on your technical drawings (PDF, CAD, or 3D models).
Rigorous Quality Control & Manufacturing
High-Precision Machining: Leveraging our fleet of 80 CNC machines and precision grinding centers, we ensure every component achieves micron-level accuracy.
Full Supply Chain Integration: From raw material processing and heat treatment to precision grinding and final inspection, the entire process is completed in-house. This end-to-end control guarantees stable lead times and uncompromising quality.
FAQ
1. Q: What is the difference between an SFI nut and a regular sliding screw nut?
A: The core difference lies in the transmission method and efficiency. A regular sliding nut operates through direct metal surface friction, which results in high resistance, higher power consumption, and easy wear. The SFI nut, on the other hand, transmits motion through ball rolling, which reduces friction resistance, greatly improves transmission efficiency, provides more precise positioning, and has a longer lifespan. It is suitable for automation equipment and precision machine tools.
2. Q: Can an SFI nut eliminate backlash? How is it adjusted?
A: Yes, it can. Axial backlash can be eliminated through preload adjustment, improving positioning accuracy and rigidity. Specifically, the appropriate preload level is chosen based on the equipment requirements and paired with the corresponding structural design to achieve this. During installation, just follow standard procedures; no extra complex adjustments are needed.
3. Q: Can SFI nuts be used in workshops with dust?
A: Absolutely. The SFI nut itself has a closed-loop internal circulation structure that effectively prevents dust, metal shavings, and other debris from entering, protecting the raceway and balls from wear. If the environment is particularly dusty and harsh, dust-proof seals can be used to further enhance adaptability to the conditions.
4. Q: Is installing an SFI nut troublesome? How compatible is it?
A: Installation is very simple. It features a standardized four-hole flange design, which can be secured directly with bolts, without the need to modify mounting holes. It is also highly compatible and can match with various specifications of ball screws. Whether for new equipment development or retrofitting old equipment, it can be easily integrated.
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