The LM12UU 12 MM Linear Motion Bearing is a precision-engineered linear ball bearing designed for smooth, low-friction motion along a single axis in compact, light-duty applications. Manufactured with a high-carbon chromium steel outer casing, synthetic resin retainer plate, and hardened end rings, it delivers reliable performance, excellent load capacity, and extended service life. Ideal for small-format 3D printers, CNC machines, robotics, DIY automation, and precision prototyping equipment.
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Product Identification
| Field | Value |
|---|---|
| Product Type | Linear Motion Bearing |
| Model | LM12UU |
| Type | Closed Type |
| Bore Diameter | 12 mm |
| Outer Diameter | 21 mm |
| Outer Casing Material | High-Carbon Chromium Steel |
| Retainer Material | Synthetic Resin |
| End Rings | Hardened Coat |
| Design | Ball Cage Loop |
| Interchangeable | Yes (Standardized Parts) |
| Lubrication | Required (Shaft) |
| Shaft Requirement | Chrome Plated, G6 Tolerance, Hardened |
Contact our technical sales team with your application requirements, shaft diameter, or load specifications for expert assistance.
Technical Specifications
- • Model: LM12UU
- • Type: Closed Type
- • Bore Diameter: 12 mm
- • Outer Diameter: 21 mm
- • Outer Casing: High-Carbon Chromium Steel
- • Retainer Material: Synthetic Resin
- • End Rings: Hardened Coat
- • Design: Ball Cage Loop
- • Operation: Low Noise, High Speed
- • Interchangeable: Yes
- • Lubrication: Required (Shaft)
- • Shaft Requirement: Chrome Plated, G6 Tolerance, Hardened
LM Bearing Dimension Charts
Refer to the dimension charts below for complete LM bearing size specifications, including length, weight, and mounting dimensions:
LM12UU 12 MM Linear Motion Bearing – Product Overview
The LM12UU 12 MM Linear Motion Bearing is a precision ball bushing designed for smooth, low-friction linear motion along a single axis in compact, light-duty applications. With a 12 mm bore and 21 mm outer diameter, it offers excellent load capacity in one of the most space-efficient packages in the LM series.
The bearing features a high-carbon chromium steel outer casing that provides exceptional strength and rigidity. The synthetic resin retainer plate ensures accurate ball guidance while minimizing noise, even during high-speed operation. Hardened end rings with a protective coat extend the bearing’s service life and protect against wear.
All components are standardized and interchangeable, so replacing worn parts is simple and cost-effective — no need to replace the entire assembly. For optimal performance and smooth motion, the shaft should be lubricated and should meet G6 tolerance with a chrome-plated, hardened surface.
Compatibility & Interchangeability
The LM12UU 12 MM Linear Motion Bearing offers broad compatibility and is designed for seamless integration into existing systems:
- • Compatible with 12 mm diameter round shafts
- • Closed type design for unsupported shaft applications
- • Standardized dimensions for easy replacement
- • Interchangeable with industry-standard LM12UU bearings
- • Suitable for use in mounted slide units
- • Works with chrome-plated G6 tolerance shafts
For optimal performance, ensure your shaft meets G6 tolerance and is properly lubricated. Contact our technical team for installation guidance.
Key Features & Benefits
- • High-Carbon Chromium Steel Casing: Exceptional strength, rigidity, and durability
- • Synthetic Resin Retainer: Precise ball guidance with low noise operation
- • Hardened End Rings: Enhanced wear resistance and extended service life
- • Compact 12 mm Bore: Ultra space-efficient design for small equipment
- • Low Friction Motion: Smooth, precise movement along a single axis
- • Interchangeable Parts: Easy replacement of worn components
- • Low Noise Operation: Suitable for high-speed applications
- • Entry-Level Size: Ideal starting point for small automation projects
LM12UU Linear Motion Bearing – Industrial Applications
The LM12UU is a compact linear bearing suited for a wide range of space-constrained applications:
- • Small-Format 3D Printers: Precision axis motion for compact printers
- • Desktop CNC Machines: Reliable linear motion for light cutting
- • Robotics: Compact joint and axis movement
- • DIY Automation: Prototyping and custom machinery builds
- • Mounted Slide Units: Component carriage and positioning
- • Light Industrial Equipment: Compact linear guidance systems
Application suitability depends on load requirements, shaft quality, lubrication, and operating conditions. Contact our team for selection assistance.
Frequently Asked Questions
What is an LM12UU linear motion bearing?
The LM12UU is a compact closed-type linear ball bearing with a 12 mm bore diameter and 21 mm outer diameter. It provides smooth, low-friction linear motion along a round shaft and is ideal for small-format 3D printers, desktop CNC machines, and compact automation equipment.
What is the difference between LM12UU and LM12UU OP?
LM12UU is the closed type bearing used on unsupported shafts. LM12UU OP is the open type bearing with a cutout that allows it to be used on supported shafts. The closed type (LM12UU) is preferred when the shaft does not require support along its length.
What shaft specifications are required for the LM12UU?
The LM12UU is designed for use with 12 mm diameter round shafts. For optimal performance, the shaft should be chrome-plated, hardened, and meet G6 tolerance specifications. Proper lubrication is also essential for smooth motion.
Is the LM12UU suitable for small 3D printers?
Yes. The LM12UU is widely used in small-format 3D printers that use 12 mm shafts. Its ultra-compact size, low friction, and smooth motion make it ideal for precision printing applications with limited space.
How do I maintain the LM12UU linear bearing?
Regular maintenance includes keeping the shaft clean and properly lubricated. Inspect the bearing for signs of wear such as increased noise, rough motion, or visible damage. Replace worn components promptly to prevent system failure.
Is the LM12UU suitable for high-speed applications?
Yes. The synthetic resin retainer and precision ball guidance system ensure low noise and smooth operation even at high speeds, making it suitable for demanding motion control applications in compact equipment.
About Linear Motion Bearings
Linear motion bearings, also known as linear ball bearings or ball bushings, are precision components designed to provide smooth, low-friction motion along a single axis. They are essential in applications requiring precise linear guidance, including 3D printers, CNC machines, robotics, and industrial automation. Explore our complete linear motion bearing range →
Why Choose Golden Bearing Company
- ✓ Premium Quality Bearings
- ✓ Wide Product Range
- ✓ Technical Selection Assistance
- ✓ OEM & MRO Support
- ✓ Bulk Order Capabilities
- ✓ Industrial Quotations
- ✓ GST Tax Invoice
- ✓ Nationwide Delivery
- ✓ Technical Support Available
Complete linear motion bearing support is available, including LM, LME, LMF, LKM, and SC series bearings, as well as supported shafts and mounting accessories. Contact us for current availability and technical assistance.
Available LM Bearing Sizes
Not sure whether the LM12UU is the correct size? Compare all linear motion bearing sizes →
LM series linear motion bearings are available in a wide range of standard sizes to suit various shaft diameters and load requirements.
LM8UU
LM10UU
LM12UU
LM13UU
LM16UU
LM20UU
LM25UU
LM30UU
LM35UU
LM40UU
LM50UU
LM60UU
LM80UU
LM100UU
Open type (OP) and closed type variants available for most sizes. Contact our team for availability.
Request a Quote
Contact our technical sales team for current availability, pricing, lead time, product selection assistance, or bulk industrial quotations. Click here to contact us →
