Introduction
SFA Nut is a precision transmission component adapted to ball screws, which adopts an optimized internal circulation ball structure design, which greatly reduces frictional resistance through the smooth rolling of the ball between the screw and the nut raceway, and eliminates axial backlash with the help of precise preload process to achieve high rigidity and high precision linear transmission. Its overall structure is compact, easy to install, excellent wear resistance, low noise and good stability during operation, and can maintain stable transmission accuracy in long-term high-frequency operation, and subsequent lubrication and maintenance are also very simple.
Product Parameters
The core parameters of SFA Nut cover the basic specifications of the lead screw adaptation, and define the adaptability of the two; Including the accuracy level that divides the accuracy of the transmission and the ball cycle that determines the smoothness of operation. There are also preload adjustment types to ensure backlash-free transmission, load-related indicators that reflect the bearing capacity of components, and rigid parameters that reflect operational stability; It also involves materials and surface treatment processes that affect service life, as well as configurations related to protective structures that improve environmental adaptability.
|
Model No. |
Shaft diameter |
Lead (of a screw) |
Bead diameter |
Nut size |
Ball screw nut rated load |
Rigidity |
||||||||||
|
K |
||||||||||||||||
|
D |
A |
E |
B |
L |
W |
H |
X |
Q |
n |
Ca(kgf) |
C0a(kgf) |
kgf/μm |
||||
|
SFA1205-2.8 |
12 |
5 |
2.5 |
24 |
40 |
5 |
10 |
30 |
32 |
30 |
4.5 |
2.8×1 |
661 |
1316 |
19 |
|
|
SFA1210-2.8 |
10 |
2.5 |
24 |
40 |
5 |
10 |
42 |
32 |
30 |
4.5 |
2.8×1 |
642 |
1287 |
19 |
||
|
SFA1605-3.8 |
15 |
5 |
2.778 |
28 |
48 |
5 |
10 |
31 |
38 |
40 |
5.5 |
M6 |
3.8×1 |
1112 |
2507 |
30 |
|
SFA1610-2.8 |
10 |
2.778 |
28 |
48 |
5 |
10 |
42 |
38 |
40 |
5.5 |
M6 |
2.8×1 |
839 |
1821 |
23 |
|
|
SFA1616-2.8 |
16 |
2.778 |
28 |
48 |
5 |
10 |
43 |
38 |
40 |
5.5 |
M6 |
1.8×1 |
852 |
11137 |
14 |
|
|
SFA1616-2.8 |
16 |
2.778 |
28 |
48 |
5 |
10 |
59 |
38 |
40 |
5.5 |
M6 |
2.8×1 |
508 |
1769 |
22 |
|
|
SFA1620-1.8 |
20 |
2.778 |
28 |
48 |
5 |
10 |
50 |
38 |
40 |
5.5 |
M6 |
1.8×1 |
554 |
1170 |
14 |
|
|
SFA1630-1.8 |
30 |
2.778 |
28 |
48 |
7 |
10 |
70 |
38 |
40 |
5.5 |
M6 |
1.8×1 |
534 |
1195 |
14 |
|
|
SFA2005-3.8 |
20 |
5 |
3.175 |
36 |
58 |
7 |
10 |
33 |
47 |
44 |
6.6 |
M6 |
3.8×1 |
1494 |
3681 |
37 |
|
SFA2010-3.8 |
10 |
3.175 |
36 |
58 |
7 |
10 |
52 |
47 |
44 |
6.6 |
M6 |
3.8×1 |
1516 |
3833 |
40 |
|
|
SFA2020-2.8 |
20 |
3.175 |
36 |
58 |
7 |
10 |
52 |
47 |
44 |
6.6 |
M6 |
2.8×1 |
764 |
1758 |
19 |
|
|
SFA2020-1.8 |
20 |
3.175 |
36 |
58 |
7 |
10 |
72 |
47 |
44 |
6.6 |
M6 |
1.8×1 |
1110 |
2134 |
29 |
|
|
SFA2505-3.8 |
25 |
5 |
3.175 |
40 |
62 |
7 |
10 |
33 |
51 |
48 |
6.6 |
M6 |
3.8×1 |
1658 |
4658 |
43 |
|
SFA2510-3.8 |
10 |
3.175 |
40 |
62 |
7 |
12 |
52 |
51 |
48 |
6.6 |
M6 |
3.8×1 |
1638 |
4633 |
45 |
|
|
SFA2525-2.8 |
25 |
3.175 |
40 |
62 |
7 |
12 |
60 |
51 |
48 |
6.6 |
M6 |
2.8×1 |
843 |
2199 |
22 |
|
|
SFA2525-1.8 |
25 |
3.175 |
40 |
62 |
7 |
12 |
85 |
51 |
48 |
6.6 |
M6 |
1.8×1 |
1232 |
3421 |
34 |
|
|
SFA3205-3.8 |
32 |
5 |
3.175 |
50 |
80 |
9 |
12 |
35 |
65 |
62 |
9 |
M6 |
3.8×1 |
1839 |
6026 |
51 |
|
SFA3210-3.8 |
31 |
10 |
3.969 |
50 |
80 |
9 |
12 |
53 |
65 |
62 |
9 |
M6 |
3.8×1 |
2460 |
7255 |
55 |
|
SFA3220-2.8 |
20 |
3.969 |
50 |
80 |
9 |
12 |
72 |
65 |
62 |
9 |
M6 |
2.8×1 |
1907 |
5482 |
43 |
|
|
SFA3232-2.8 |
32 |
3.969 |
50 |
80 |
9 |
12 |
78 |
65 |
62 |
9 |
M6 |
1.8×1 |
1257 |
3426 |
27 |
|
|
SFA3232-2.8 |
32 |
3.969 |
50 |
80 |
9 |
12 |
110 |
65 |
62 |
9 |
M6 |
2.8×1 |
1838 |
5329 |
42 |
|
|
SFA4005-3.8 |
40 |
5 |
3.175 |
63 |
93 |
9 |
14 |
39 |
78 |
70 |
9 |
M8 |
3.8×1 |
2018 |
7589 |
60 |
|
SFA4010-3.8 |
38 |
10 |
6.35 |
63 |
93 |
9 |
14 |
57 |
78 |
70 |
9 |
M8 |
3.8×1 |
5035 |
15943 |
67 |
|
SFA4020-2.8 |
20 |
6.35 |
63 |
93 |
9 |
14 |
78 |
78 |
70 |
9 |
M8 |
2.8×1 |
3959 |
10715 |
54 |
|
|
SFA4040-1.8 |
40 |
6.35 |
63 |
93 |
9 |
14 |
96 |
78 |
70 |
9 |
M8 |
1.8×1 |
2585 |
6648 |
34 |
|
|
SFA4040-2.8 |
40 |
6.35 |
63 |
93 |
9 |
14 |
136 |
78 |
70 |
9 |
M8 |
2.8×1 |
3780 |
10341 |
52 |
|
|
SFA5005-3.8 |
50 |
5 |
3.175 |
75 |
110 |
10.5 |
15 |
42 |
93 |
85 |
11 |
M8 |
3.8×1 |
2207 |
9542 |
68 |
|
SFA5010-3.8 |
48 |
10 |
6.35 |
75 |
110 |
10.5 |
18 |
57 |
93 |
85 |
11 |
M8 |
3.8×1 |
5638 |
17852 |
79 |
|
SFA5020-3.8 |
20 |
6.35 |
75 |
110 |
10.5 |
18 |
99 |
93 |
85 |
11 |
M8 |
3.8×1 |
5749 |
18485 |
87 |
|
|
SFA5050-2.8 |
50 |
6.35 |
75 |
110 |
10.5 |
18 |
188 |
93 |
85 |
11 |
M8 |
1.8×1 |
2496 |
8749 |
42 |
|
|
SFA5050-2.8 |
50 |
6.35 |
75 |
110 |
10.5 |
18 |
167 |
93 |
85 |
11 |
M8 |
2.8×1 |
4308 |
13610 |
65 |
|
Core Advantages
1. Excellent quiet operation performance: Featuring an optimized end-cap circulation design and improved circulator fixation method, it significantly reduces noise interference during operation, maintaining smooth and quiet performance even at high speeds. At the same time, the special circulation structure ensures excellent operational smoothness under high lead conditions, preventing stuttering or jerking.
2. Advantages of both positioning accuracy and rigidity: Through a zero-gap design and precision machining process, it ensures accurate positioning during transmission, with outstanding micro-feed capability. The overall structure is reinforced for excellent rigidity, resisting deformation even under load or long-stroke operation, thus maintaining stable transmission accuracy.
3. Wear-resistant, durable, and energy-efficient: Core components are made of high-quality materials with professional surface treatment, combined with rolling friction transmission, significantly reducing dynamic friction. This not only reduces component wear but also lowers energy consumption. After structural improvements, its service life is greatly extended compared to traditional models, meeting the demands of high-frequency, high-load long-term operation.
4. Flexible installation compatibility: Maintains the same installation dimensions as classic models, allowing direct replacement of existing parts without modifying the equipment installation structure. With a wide range of specifications, it accommodates various lead requirements. The compact nut design does not take up extra installation space, fitting different equipment assembly layouts.
Applicable scenarios: Suitable for dispensing machines, laser engraving machines, precision printers, electronic assembly equipment, and other applications where high transmission precision and space efficiency are required.
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: Why is the noise of the SFA nut during operation higher than expected?
A: It is most likely due to improper grease selection, a loose recirculator, or excessive coaxial deviation between the screw and the nut. The silent design of the SFA nut requires high viscosity and cleanliness of the grease. If the grease contains many impurities or has mismatched viscosity, it will increase friction noise between the balls and the raceway; a loosely installed recirculator can cause wobbling, and coaxial deviation can result in uneven friction. It is recommended to replace with the designated grease, re-tighten the recirculator, and calibrate the installation accuracy.
2. Q: Can the dust-proof structure of the SFA nut be cleaned by direct washing?
A: High-pressure washing is not recommended. Its dust scraper is elastically designed, and high-pressure water can damage the scraper structure and may allow water to seep into the raceway causing rust. During cleaning, the nut should first be disassembled, surface dust should be removed using a soft brush, then the raceway should be wiped with a clean cloth, and finally, new grease should be applied.
3. Q: Can the SFA nut be used with non-original ball screws?
A: It is not recommended to mix freely. The recirculation structure and preload parameters of the SFA nut are designed to match specific screw specifications. Using a non-original screw may lead to insufficient contact between the balls and the raceway, loss of preload, and result in reduced transmission accuracy and accelerated component wear. If you need to replace the screw, it is recommended to choose a compatible product of the same specification.
4. Q: What should I do if the SFA nut becomes stuck and cannot rotate after long-term disuse?
A: This is caused by dried and hardened grease or slight rust on the raceway. Do not force it to rotate to avoid damaging the recirculator and raceway. You can first drop a small amount of special lubricating oil at both ends of the nut, let it sit for a while to soften the hardened grease, then slowly turn the nut by hand. Once the sticking is relieved, disassemble it, thoroughly clean the interior, and replace it with new grease.
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