Outer Sleeve (Outer Ring / Bearing Body)
Rolling Elements (Steel Balls)
Ball Retainer / Cage
End Seals
Delivery time: 7-10 days
Linear bearings are designed to provide smooth, precise, and low-friction linear motion along a shaft or rail system. Compared with traditional sliding mechanisms, linear bearings significantly reduce friction, improve positioning accuracy, and extend equipment service life.
Linear bearings operate on a rolling contact principle using hardened steel balls circulating within raceways.
Performance Value:
Extremely low coefficient of friction (typically 0.001–0.005)
Minimal starting resistance
Smooth and continuous linear travel
Reduced motor load and energy consumption
Practical Impact: Improves motion stability in CNC systems, automation modules, and precision assembly lines.
The precision-ground raceways and controlled ball clearance ensure accurate linear guidance.
Performance Value:
Tight radial clearance control
Minimal positional deviation
High repeatability in reciprocating motion
Suitable for tolerance-sensitive applications
Typical Accuracy Range: ±0.01 mm to ±0.05 mm (depending on shaft quality and assembly precision)
Practical Impact: Essential for precision manufacturing equipment, robotics, and measuring systems.
Linear ball bearings are optimized primarily for radial load support, with limited axial load capability.
Performance Value:
High radial load-to-size ratio
Uniform load distribution across multiple rolling elements
Stable operation under dynamic conditions
Practical Impact: Reliable support in automated equipment, packaging systems, and light-to-medium duty industrial machinery.
Service life is influenced by material hardness, lubrication condition, load, and environmental factors.
Performance Value:
Hardened bearing steel (GCr15 / 100Cr6) with high wear resistance
Optimized ball circulation design
Consistent load distribution
Extended fatigue life under proper lubrication
Practical Impact: Reduced maintenance frequency and improved equipment uptime.
The specifications of linear bearings mainly cover dimensions (inner diameter d, outer diameter D, length L) and load capacity (basic dynamic load rating C, static load C0). Common types include standard type (LM/LM-UU), extended type (LME/LM-L), flange type (LMF/LMK), and open type (LM-OP). Commonly used metric series sizes range from small to large, such as LM6UU to LM60UU.
| Part Number | inner diameter d(mm) | outer diameter D(mm) | length L(mm) | Dynamic load C (N) | static load C0 (N) |
| LM6UU | 6 | 12 | 19 | 210 | 400 |
| LM8UU | 8 | 15 | 24 | 270 | 400 |
| LM10UU | 10 | 19 | 29 | 380 | 600 |
| LM12UU | 12 | 21 | 30 | 520 | 800 |
| LM16UU | 16 | 28 | 37 | 790 | 1,200 |
| LM20UU | 20 | 32 | 42 | 890 | 1,400 |
| LM25UU | 25 | 40 | 59 | 1,600 | 2,600 |
| LM30UU | 30 | 45 | 64 | 1,600 | 2,700 |
| LM40UU | 40 | 60 | 80 | 3,200 | 5,500 |
| LM50UU | 50 | 80 | 100 | 3,900 | 8,000 |
Part Number: Typically LM (diameter) UU, where UU indicates the bearing has seals at both ends.
Inner Diameter (d): Diameter of the bearing’s mounting shaft.
Outer Diameter (D): Diameter of the bearing housing, determining the size of the mounting hole.
Length (L): Total length of the bearing.
Basic Dynamic Load Rating (C): The load the bearing can withstand during reciprocating linear motion at its rated life.
Basic Static Load Rating (C0): The maximum allowable load for the bearing at rest or at very low speeds.
Accurate linear guidance with minimal deviation
Smooth movement without stick-slip phenomenon
Suitable for precision positioning systems
Rolling contact design dramatically reduces friction
Lower drive power requirements
Reduced motor load and energy consumption
Hardened raceways and precision steel balls
Optimized internal circulation design
Excellent wear resistance under continuous operation
Compact size with strong radial load capability
Suitable for space-limited applications
Can be combined with housing units for easier installation
Standardized dimensions (compatible with international models such as LM, LME series)
Interchangeable with major global brands
Simple shaft-based mounting
Non-standard sizes
Customized seals or lubrication
Private labeling for distributors
Axis movement systems
Tool positioning mechanisms
Worktable sliding systems
Automated assembly lines
Robotic arms and linear actuators
Pick-and-place modules
Film feeding systems
Precision printing positioning
High-speed reciprocating movement modules
Diagnostic machines
Sample handling systems
Precision scanning devices
X/Y/Z axis motion systems
Desktop automation devices
Educational and prototype equipment
VKUKEN has over 30 years of experience in bearing design and manufacturing. We can customize non-standard bearings according to customer drawings, or we can measure and create drawings of existing bearings on-site and then manufacture custom bearings based on those drawings. Our team of professional engineers has over 20 years of experience in bearing design and measurement.
We have found that many people would like to learn about the application technology and selection of Bearing but do not have suitable materials to read. Our team of engineers constantly exports technology on our download page and blog, which you can download for free.
Hi, I am Maxwell, I am an engineer in the field of bearing applications. I majored in mechanical and electromechanical engineering during college. After graduation, I worked for the top three "SKF" bearing companies in the world for ten years , during which I went to dozens of customers in different industries to help them solve problems in bearing applications; later I joined VKUKEN Bearing Manufacturing, and I will share bearing technical knowledge on this website from time to time. If you are a customer Please contact me to help you solve your problem; if you are also a technical expert in bearings, I am very willing to exchange technical knowledge about bearings with you.
