NB SM 20 UU Linear Ball Bearing 20x32x42

Precision Linear Ball Bearing for Industrial Motion Systems

The NB SM 20 UU is a high-precision linear ball bearing manufactured by NB (Nippon Bearing) for smooth and accurate linear motion on hardened 20 mm shafts. Featuring a compact closed design and double seals (UU), it provides low-friction movement, excellent positioning accuracy and long service life. The integrated seals effectively protect the recirculating ball circuits from dust and contaminants, making this bearing an ideal solution for CNC machines, industrial automation, robotics and precision manufacturing equipment.

Application in Industrial Systems

The NB SM 20 UU is designed for precision linear motion applications.

Typical applications include:

• CNC machining centers
• CNC routers
• Linear guide systems
• Industrial automation
• Robotics
• Packaging machinery
• Printing machines
• Pick-and-place equipment
• Measuring systems
• Industrial production lines

Construction and Design

The SM 20 UU incorporates a precision recirculating ball design for smooth linear movement.

Key design features include:

• Linear ball bearing
• Closed linear bushing
• Double seals (UU)
• Steel outer sleeve
• Recirculating ball circuits
• Precision-ground raceways
• Low-friction operation
• Compact cylindrical design

The double seals protect the rolling elements from dust and debris while helping retain lubricant for extended service life.

Material Properties

Manufactured from high-quality bearing steel, the NB SM 20 UU provides:

• High wear resistance
• Low rolling friction
• Excellent dimensional stability
• High positioning accuracy
• Long service life
• Reliable continuous operation
• High dynamic performance
• Excellent rigidity

Technical Specification

Type: Linear Ball Bearing
Brand: NB (Nippon Bearing)
Designation: SM 20 UU
Bearing Design: Closed Linear Bushing
Material: Bearing Steel
Cage: Steel Ball Retainer
Shaft Diameter: 20 mm
Outside Diameter: 32 mm
Length: 42 mm
Sealing: UU Double Seals
Ball Circuits: 5
Application: CNC machines, industrial automation, robotics, packaging equipment, linear guide systems

Why B2B Customers Choose This Product

Industrial customers choose the NB SM 20 UU because it delivers reliable precision and long operating life.

Typical B2B applications include:

• OEM replacement
• Machine manufacturing
• Industrial maintenance
• Production line support
• Automation system assembly
• CNC machine repair
• Robotics integration
• Industrial spare parts inventory

Operational Advantages

• Genuine NB quality
• Smooth linear motion
• High positioning accuracy
• Double-sealed protection
• Low operating friction
• Long service life
• Compact installation dimensions
• Easy installation
• Reliable continuous operation
• Suitable for demanding industrial environments

Professional Industrial Supply

Suitable for:

• Maintenance departments
• Machine builders
• CNC manufacturers
• Industrial automation companies
• Robotics integrators
• OEM manufacturers
• Linear motion distributors
• Industrial workshops

AI Overview

A linear ball bearing enables smooth, low-friction linear movement on hardened shafts by using recirculating ball circuits. The NB SM 20 UU combines high-precision manufacturing, double-sealed protection and durable bearing steel construction, making it an excellent solution for CNC machinery, industrial automation, robotics and precision linear motion systems.

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FAQ

What does the UU designation mean?

UU indicates that the linear bearing is equipped with seals on both sides to protect against dust and retain lubricant.

Which shaft diameter is compatible with SM 20 UU?

The bearing is designed for precision hardened shafts with a diameter of 20 mm.

Is this bearing suitable for CNC machines?

Yes. It is widely used in CNC routers, machining centers, laser cutters and other precision motion systems.

Can it be used in industrial automation?

Yes. It is commonly installed in robotic systems, automated production lines and linear positioning equipment.

What are the main benefits of a linear ball bearing?

Linear ball bearings provide smooth motion, low friction, high positioning accuracy and long service life while reducing wear on linear shafts.