Your Professional Linear Motion Bearing Supplier
Zhejiang Siqiang Bearing Manufacturing Co., LTD. (brand name "SQ"), located in Lishui City, Zhejiang Province, CHINA, was established in 2007 and mainly produces linear bearings, linear guides and blocks, ball screws, joint bearings, and cam followers; Our factory covers 25,333 m² and operates over 200 CNC machines, including German-made equipment and fully automated production lines. With an annual capacity of more than 5 million units,Our professional R&D, production, and quality-control teams enable us to deliver reliable, precision-engineered products for global industrial applications.
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![LM20UU Stainless Steel]()
LM20UU Stainless SteelPRODUCT NAME: STAINLESS STEEL LINEAR BEARING. SIZE:LM20UU-SS. MATERIAL :SS304. ID ( INNER DIAMTER):20MM. OD(OUTER DIAMTER):32MM. LENGTH:42MM. -
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![Linear Motion Bearing ST20]()
Linear Motion Bearing ST20PRODUCT NAME: LINEAR BEARING. SIZE:ST20UU. ID ( INNER DIAMTER):20MM. OD(OUTER DIAMTER):32MM. LENGTH:45MM. -
![Linear Motion Bearing LM20UU]()
Linear Motion Bearing LM20UULinear Motion Bearing LM20UU are mechanical components designed for linear motion, primarily used to support and guide reciprocating or linear displacement in mechanical systems. By reducing -
![Linear Motion Bearing LME20UU]()
Linear Motion Bearing LME20UUThe rolling elements (e.g., balls) circulate between the shaft and bearing, converting sliding friction into rolling friction, thereby enabling low-resistance, high-precision linear motion. -
![LM20LUU]()
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![LME20LUU]()
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![LM20UUOP]()
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![LM20UUAJ]()
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Why choose us
Our Certificate
Our have ISO9001 Quality Certification System.ensuring consistent and reliable product performance.
Quality Control and Testing
A complete testing system and strict process control ensure stable quality, earning long-term trust and positive feedback from international clients.
Sales Market
We have exported to Asia, Europe, the Americas, and the Middle East, serving markets such as Germany, Italy, the U.S., products are well received in these markets.
Service Advantages
From pre-sales consultation and customized design to order tracking and after-sales support, we offer responsive and comprehensive service to reduce buyer risks.
Linear Motion Bearing ST20
A Linear Bearing ST20 is a precision mechanical component designed to provide smooth, low-friction linear motion along a shaft or rail. Widely used in industrial automation, robotics, and high-precision machinery, ST20 bearings come in various configurations to meet different performance requirements.
|
Dr |
D |
L |
Load rating |
|||||||||||||
|
SIZE |
Max stroke(mm) |
No.of ball rows |
Weight(g) |
mm |
Tolearnace (μm) |
mm |
Tolearnace (μm) |
mm |
Tolearnace (μm) |
E |
T |
T |
D |
R |
CN |
CON |
|
ST 8 UU |
24 |
3 |
15.6 |
8 |
+22 |
15 |
0 |
24 |
0 |
17.1 |
1.5 |
0.5 |
1.2 |
0.5 |
245 |
343 |
|
ST 10 UU |
30 |
3 |
28.8 |
10 |
+22 |
19 |
0 |
30 |
0 |
22.7 |
1.5 |
0.5 |
1.2 |
0.5 |
461 |
637 |
|
ST 12 UU |
32 |
3 |
42 |
12 |
+27 |
23 |
0 |
32 |
0 |
24.5 |
1.5 |
0.5 |
1.2 |
0.5 |
813 |
1070 |
|
ST 16 UU |
40 |
3 |
71 |
16 |
+27 |
28 |
0 |
37 |
0 |
29.1 |
1.5 |
0.7 |
1.3 |
0.5 |
990 |
1180 |
|
ST 20 UU |
50 |
3 |
99 |
20 |
+33 |
32 |
0-16 |
45 |
0 |
35.8 |
2 |
0.7 |
1.5 |
0.5 |
1170 |
1260 |
|
ST 25 UU |
50 |
3 |
117 |
25 |
+33 |
37 |
0-16 |
45 |
0 |
35.8 |
2 |
0.7 |
1.6 |
1 |
1330 |
1490 |
|
ST 30 UU |
82 |
3 |
205 |
30 |
+33 |
45 |
0-16 |
65 |
0 |
53.5 |
2.5 |
1 |
2 |
1 |
2990 |
3140 |
|
ST 35 UU |
92 |
3 |
329 |
35 |
+41 |
52 |
0 |
70 |
0 |
58.5 |
2.5 |
1 |
2 |
1.5 |
3140 |
3530 |
|
ST 40 UU |
108 |
3 |
516 |
40 |
+41 |
60 |
0 |
80 |
0 |
68.3 |
2.5 |
1 |
2 |
1.5 |
4120 |
4800 |
|
ST 50 UU |
138 |
3 |
827 |
50 |
+41 |
72 |
0 |
100 |
0 |
86.4 |
3 |
1 |
2.5 |
1.5 |
5540 |
6910 |
|
ST 60 UU |
138 |
3 |
1240 |
60 |
+49 |
85 |
0 |
100 |
0 |
86.4 |
3 |
1 |
2.5 |
2 |
5980 |
8230 |
|
ST 80 UU |
132 |
3 |
2050 |
80 |
+49 |
110 |
0 |
100 |
0 |
86 |
3 |
1.5 |
2.5 |
2 |
7840 |
12200 |
|
ST 100 UU |
144 |
3 |
2440 |
100 |
+58 |
130 |
0-25 |
100 |
0 |
86 |
3 |
1.5 |
2.5 |
2 |
8430 |
14700 |
Advantages of Linear Motion Bearing ST20
Reduces Friction:
Minimizes heat generation and energy loss during movement, allowing for smoother and more efficient operation.
Prevents Wear:
Forms a protective film between rolling elements and raceways, reducing metal fatigue and extending component life.
Protects Against Corrosion:
Many lubricants contain anti-rust additives that shield internal surfaces from moisture and contaminants.
Removes Debris:
Certain greases help trap and carry away small particles that could otherwise cause abrasion.
Type of Linear Motion Bearing ST20
Ball Linear Bearings
These bearings use precision steel balls as rolling elements to minimize friction and support high radial and axial loads. The ball circulation system ensures consistent contact and smooth movement even under heavy loads.
Cage Ball Linear Bearings
These incorporate a precision-engineered cage or retainer that separates the balls, preventing direct contact and reducing ball-to-ball friction. This design enhances speed, smoothness, and operational cleanliness.
Magnetic Linear Bearings
Unlike traditional mechanical bearings, magnetic linear bearings use electromagnetic or permanent magnetic fields to levitate and guide the moving element, eliminating physical contact and friction.
Linear Bearing Bushings
These are cylindrical sleeves that slide over a hardened shaft, often incorporating ball or roller elements. They offer a compact, robust solution for linear motion in confined spaces.
Applications of Linear Motion Bearing ST20
CNC Machinery
In Computer Numerical Control (CNC) machines, Linear Bearing ST20 play a vital role in guiding cutting tools along precise axes with minimal friction. These ball-bearing systems ensure that spindles and tool heads move smoothly and accurately, enabling clean, consistent cuts on materials such as metal, wood, and composites.
3D Printers
3D printers rely on precise movement of the print head and build platform to create accurate layer-by-layer models. Linear Bearing ST20 are commonly used in conjunction with aluminum rails to facilitate smooth, controlled motion along the X, Y, and Z axes.
Medical Equipment
In advanced medical devices such as MRI scanners, CT machines, and robotic surgical systems, precision and reliability are non-negotiable. Linear Bearing ST20 with cage-guided ball designs provide smooth, controlled linear motion for moving patient tables, imaging components, and surgical arms.
Robotics
Modern robotics demands components that deliver both strength and precision under dynamic loads. Linear Bearing ST20Packaging Machines
Manufacturing Materials of Linear Motion Bearing ST20
Chromium Plating:
Improves surface hardness and reduces friction, increasing wear resistance.
Zinc or Nickel Coatings:
Provide corrosion protection, especially important in humid, outdoor, or washdown environments such as food processing or medical facilities.
Black Oxide Finish:
Offers mild corrosion resistance and reduces glare, commonly used in industrial settings.
Prepare the Shaft
Clean the linear shaft thoroughly using a lint-free cloth and isopropyl alcohol. Remove any dust, oil residue, or debris that could interfere with smooth bearing movement or cause abrasion.
Apply Lubrication
Coat the shaft section where the bearing will be mounted with a thin layer of compatible grease. This reduces friction during installation and ensures immediate protection upon operation.
Align the Bearing
Position the ST20 at the end of the shaft, ensuring it is perpendicular and aligned straight. Misalignment during installation can damage the internal ball circuit or cause binding.
Slide Onto the Shaft
Gently push the bearing along the shaft using even pressure. It should glide smoothly due to lubrication. If resistance occurs, stop and inspect for burrs, dirt, or shaft deformation.
Secure the Bearing
Depending on the system, use retaining clips, set screws, or flanged housings to fix the bearing in place. Ensure it is securely positioned without over-tightening, which could induce stress or restrict motion.
Correct Installation: Misalignment during mounting is a leading cause of premature bearing failure. Use precision alignment tools and follow manufacturer guidelines to ensure the rail and bearing are perfectly parallel and securely fastened.
Avoid Overloading: Exceeding the dynamic or static load ratings can cause deformation, increased wear, or catastrophic failure. Always verify the load requirements of your application against the bearing’s specifications.
Use OEM or Certified Replacement Parts:
Aftermarket or non-certified bearings may not meet the same tolerances or material standards, potentially compromising performance and safety. Original Equipment Manufacturer (OEM) components guarantee compatibility and reliability.
Environmental Suitability:
Select bearings with appropriate seals and coatings for the operating environment—e.g., stainless steel or sealed variants for wet or corrosive conditions.
Safety Monitoring:
Integrate sensors or monitoring systems in critical applications to detect vibration, temperature rise, or irregular motion that may indicate bearing issues.
Maintenance and Repair Guidelines
Periodic Inspection
Check bearings every 50–100 operating hours for signs of wear, such as rough movement, noise, or visible damage. Look for rust, pitting, or discoloration on raceways and balls.
01
Lubrication Schedule
Reapply grease through the lubrication port every 1–3 months, depending on usage. In high-dust environments, more frequent lubrication may be required. Use only manufacturer-recommended lubricants to avoid seal degradation.
02
Cleaning Procedure
Remove the bearing if possible and wipe external surfaces with a dry or slightly oiled cloth. For deep cleaning, use a solvent-safe for metal and seals, then re-lubricate before reinstallation.
03
Alignment Verification
Misalignment is a leading cause of bearing failure. Regularly check that the shaft and bearing housing are parallel and free from bending or twisting forces.
04
Timely Replacement
Replace worn or damaged bearings immediately. Continuing operation with a faulty bearing can lead to shaft damage, increased energy consumption, and system downtime. Always replace in pairs if used in dual-rail setups for balanced performance.
05
FAQ
As one of the most professional linear motion bearing manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to wholesale customized linear motion bearing made in China here from our factory.
LM20LUU, LM20UU Stainless Steel, LMB16UU
