LM Series Linear Bearing Description
LM Series Linear Bearing is a standardized type of linear bearing that uses circulating steel balls to provide low-friction, high-precision linear motion along a linear motion shaft.
The "LM" designation represents the linear bearing series, while the number indicates the inner diameter in millimeters. Common models include LM10UU, LM12UU, LM20UU, LM25UU and LM30UU.
These bearings are designed for point contact between the steel balls and the shaft, enabling smooth movement, easy installation, and wide interchangeability.
What Do "LM" and "UU" Mean in LM Series Linear Bearings?
- LM
Refers to the Linear Motion bearing series, a standardized design widely used for linear guidance systems.
- Number (10 / 12 / 20 / 25 / 30)
Indicates the shaft diameter in millimeters.
For example, LM20UU is designed for use with a 20 mm linear shaft.
- UU
Means double-sided rubber seals, which help prevent dust and contaminants from entering the bearing, ensuring smoother operation and longer service life.
LM Series Linear Bearing Specification
LM Series Linear Bearing Model Designations Explained
The LM series linear bearings are available in multiple variants to meet different installation, environmental, and application requirements. Below is an overview of the most common LM and LME model types and their meanings.
LM
Standard LM linear bearing designed for general-purpose linear motion applications.
It features a steel outer sleeve and is suitable for press-fit mounting in rigid housings.
Typical use: CNC machines, automation equipment, standard bearing blocks.
LM…C
LM linear bearing with additional clearance (C).
The increased internal clearance allows for compensation of shaft misalignment or housing tolerance.
Typical use: Applications with less precise mounting conditions.
LME
LME linear bearing with a thinner outer sleeve compared to standard LM type.
Designed for lightweight structures or aluminum housings, allowing easier installation.
Typical use: Compact equipment, aluminum frames, light-duty automation systems.
LME…C
LME linear bearing with additional clearance.
Combines a thin outer sleeve with tolerance compensation capability.
Typical use: Lightweight systems with relaxed mounting accuracy.
LM…AJ / LM…CAJ
LM linear bearing with an adjustable clearance mechanism.
- AJ: Adjustable type
- CAJ: Adjustable type with increased clearance range
These models allow precise adjustment of preload or clearance during installation.
Typical use: High-precision machinery requiring fine tuning of linear motion.
LME…AJ / LME…CAJ
LME linear bearing with adjustable clearance, designed for lightweight or aluminum housings.
- AJ: Adjustable thin-wall type
- CAJ: Adjustable thin-wall type with wider clearance adjustment
Typical use: Precision equipment with limited installation space.
LM…OP
LM linear bearing without an outer sleeve (open type).
Designed to be mounted directly into a bearing block or housing.
Typical use: Custom bearing blocks, integrated linear motion systems.
LM…COP
LM open-type linear bearing with additional clearance.
Provides greater tolerance for alignment and mounting variation.
Typical use: Systems requiring flexible installation or vibration absorption.
LME…OP / LME…COP
LME thin-wall linear bearings without an outer sleeve.
- OP: Open thin-wall type
- COP: Open thin-wall type with additional clearance
Typical use: Lightweight custom housings and compact linear motion assemblies.
Quick Summary Table
| Model Type | Key Feature | Typical Application |
|---|---|---|
| LM | Standard type | General industrial use |
| LM…C | Increased clearance | Tolerance compensation |
| LME | Thin outer sleeve | Lightweight structures |
| LME…C | Thin sleeve + clearance | Aluminum housings |
| LM…AJ / CAJ | Adjustable clearance | High-precision systems |
| LME…AJ / CAJ | Adjustable thin type | Compact precision equipment |
| LM…OP | No outer sleeve | Custom bearing blocks |
| LM…COP | Open type + clearance | Flexible installations |
| LME…OP / COP | Thin open type | Lightweight custom designs |
Applications of LM Series Linear Bearings
LM Series Linear Bearings are widely used in various industrial and automation systems where smooth, accurate, and low-friction linear motion is required. Thanks to their standardized sizes and easy installation, they are suitable for a wide range of applications.
Typical applications include:
- CNC machines and machining centers
- Automation equipment and production lines
- 3D printers and desktop manufacturing systems
- Packaging and labeling machines
- Woodworking and engraving machines
- Medical and laboratory equipment
- Robotics and linear motion modules
- Textile and printing machinery
LM linear bearings are commonly used together with hardened linear motion shafts to ensure stable operation, long service life, and consistent positioning accuracy.
Why Choose DLY?
Zhejiang DLY Automation Manufacturing Co.,Ltd.
- Over 20 Years Manufacturing Experience
DLY produces all LM series linear bearings in-house, ensuring stable quality and reliable supply.
- Standardized & Interchangeable
Manufactured to international standards, compatible with common brands for easy replacement.
- Strict Quality Control
From raw material to final inspection, every step ensures precision, smooth motion, and long service life.
- Wide Model Range & Custom Support
LM, LME, LMF, LMH series, including standard, adjustable, open, and thin-wall types. OEM available.
- Competitive Factory Pricing
Direct manufacturer pricing without compromising quality.
- Technical Support & Fast Response
Engineering and sales teams provide guidance, model selection, and quick assistance.
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