Introduction
The LME-UU (e.g., lm 30 uu bearing) linear bearing is a European standard series linear motion component designed for the European market. It features a heat-treated reinforced bearing steel housing combined with a precision ball recirculation design. The point contact between the steel balls and the shaft significantly reduces friction resistance, achieving high-precision, low-noise smooth linear motion. The double-seal structure effectively prevents dust and contamination while locking in internal lubricants. It also offers the advantages of a simple structure, good interchangeability, and easy installation, while supporting various cage material options to suit different operating conditions.
Product Parameters
The LME-UU linear bearing features a high-carbon chromium bearing steel housing and rolling elements of the same material, paired with resin or glass fiber reinforced phenolic resin cages and nitrile rubber seals. It utilizes a multi-row ball circulation system and double-end seal structure. Some models include an external retaining groove or support for clearance adjustment and open designs. Key dimensional tolerances and radial runout comply with standard specifications, with clearly defined rated load indicators. It is compatible with corresponding cylindrical shafts, operates stably within conventional industrial temperature ranges, and meets the requirements of various precision linear motion applications.
Core Advantages
1. Ultra-low friction, smooth and precise motion
(Take, for example: LM 30 UU bearing) The bearing features a point-contact design between the steel balls and the shaft, coupled with an optimized ball circulation path, which significantly reduces movement resistance. The linear motion process is completely free of any sticking. Even during high-speed back-and-forth movement, the friction coefficient remains stable, ensuring that speed changes do not affect equipment precision. The operating noise is also particularly low, providing the equipment with high-precision, low-interference performance.
2. Robust structure, long service life
The outer casing is made of high-quality bearing steel, which, after professional heat treatment, greatly enhances overall rigidity and surface hardness, offering excellent wear resistance. Certain models can be fitted with steel or reinforced resin cages to meet different rigidity requirements, securely guiding ball circulation and reducing wear between components. Bearings come pre-lubricated from the factory, requiring minimal maintenance during daily use, which significantly extends continuous operating time and overall product lifespan.
3. Double-sealed protection, suitable for multiple operating conditions
"UU" represents a double-end sealed design. On one hand, it securely locks in the internal lubricant, preventing loss or deterioration; on the other hand, it effectively blocks dust, metal shavings, oil, and other contaminants from entering the bearing and damaging the balls and raceways. With this protection, the bearings can operate reliably in dusty or debris-filled industrial environments. They are suitable for both conventional industrial equipment and precision instruments, offering exceptional reliability.
4. Standard compatibility, easy installation and replacement
Designed strictly according to European metric standards, with consistent dimensional tolerances and excellent interchangeability, they can directly replace European standard products of the same specification, saving time and effort in maintenance. The product structure is very streamlined, and some models include outer retaining grooves or multiple flange types for more stable installation and easier alignment, even accommodating minor installation deviations. They can easily meet the assembly needs of both large industrial equipment and small precision mechanisms.
Applications: Widely used in applications requiring high-precision linear motion such as precision machine tools, industrial robots, automated production lines, medical devices, and electronic manufacturing equipment.
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 man-made damage), and rapid response service for 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 a linear bearing?
Answer: Linear bearing is a precision guide component used with a cylindrical linear optical axis, the core is to guide the load parts to do infinite linear reciprocating motion along the optical axis through the rolling friction of the internal ball. It has a simple structure and low cost, and is widely used in linear motion scenarios with light load and low precision requirements, such as small slide tables, automatic assembly line conveying mechanisms, etc.
2. Q: What are the core components of linear bearings?
Answer: It is mainly composed of five core components:
Jacket: The external support structure of the bearing, divided into straight type and flange type (convenient for installation and fixation);
Cage: also known as pocket frame, used to fix the ball position and guide the ball to form a circulation loop;
Ball: the key element to achieve rolling friction, in contact with the optical shaft and the inner ring of the jacket;
Sealing ring / dust cover: installed at both ends of the bearing to prevent dust and impurities from entering the interior, while reducing lubricant leakage;
Lubrication Tank / Oil Injection Hole: Used to fill lubricant to ensure the lubrication of the ball and contact surface.
3. Q: What are the common types of linear bearings?
Answer: There are various classifications according to different dimensions:
According to the shape structure: straight type (without mounting flange, need to be fixed with circlip), flange type (with round or square flange, can be directly bolted);
Adjust according to the gap: standard clearance type, gap adjustable type (open structure, adjust the mating gap with the optical shaft by bolt tightening);
By material: metal linear bearing (steel jacket + steel ball), plastic linear bearing (engineering plastic material, self-lubricating, strong corrosion resistance);
By specification standard: metric LM series, imperial LME series.
4. Q: What is the difference between linear bearings and linear sliders (linear guide rail slides)?
Answer: The two are different guiding components, and the core differences are as follows:
Contrast dimension linear bearing linear slider
Supporting parts Used with cylindrical linear optical axis Used with special linear rail body
Bearing capacity Only bears radial load, weak anti-bias load and anti-overturning ability Can withstand multi-directional loads such as radial, axial, and overturning moment
The positioning accuracy is medium, there is a slight gap, suitable for general guidance high, the gap can be eliminated after preloading, and the repeated positioning accuracy reaches the micron level
Simple structural complexity, few parts, low cost Complexity, high degree of integration, and relatively high cost
Applicable scenarios Light load, low precision, short-stroke linear motion Linear motion under heavy load, high precision, complex working conditions
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