THK Linear Bearings: Product Guide & Where to Buy

If you're looking for THK linear bearings, choosing the right product isn't simply about matching the shaft diameter or rail size. The linear bearing needs to match the required load, stroke, speed, accuracy, mounting arrangement, rigidity, preload, lubrication and operating environment.

At Kashyap Bearing, we help customers identify suitable THK linear motion products based on the actual machine requirement rather than selecting a product only by size. Whether you need THK linear bearings for CNC machines, automation equipment, robotics, packaging machinery, machine tools, or industrial systems, you can share the product number, dimensions, photograph, rail size, shaft details or application requirements with our team.

Kashyap Bearings in SP Road, Bangalore has been serving customers since 1987, supplying a wide range of bearings and industrial products for different applications.

📍 #11/1 SP Road, Bangalore 560002 📞 9448516463 / 8951322259 💬 WhatsApp us with your bore size and application — we'll tell you exactly which THK linear bearings to buy.

What Are THK Linear Bearings?

THK linear bearings are linear motion components designed to allow smooth and controlled movement along a straight path.

Unlike conventional rotary bearings that support rotational movement, linear bearings are used when a machine component needs to move back and forth along a linear axis.

THK offers different linear motion products designed for applications requiring:

• Smooth linear movement

• High positioning accuracy

• Low friction

• High rigidity

• Repeatable motion

• High load capacity

• Long operating life

THK products are widely associated with precision linear motion systems used in industrial automation and machinery.

What Are THK Linear Motion Systems Used For?

THK linear motion products can be used in machines where components need to move accurately along a fixed path.

Typical applications include:

• CNC machines

• Machine tools

• Industrial automation

• Robotics

• Semiconductor equipment

• Packaging machinery

• Material-handling systems

• Inspection equipment

• Printing machinery

• Medical equipment

The exact THK product should be selected according to the machine's movement, load and accuracy requirements.

THK Linear Bearing Product Overview

THK's linear motion product range includes different types of components designed for different applications.

Common categories include:

• Linear guideways

• Linear guide blocks

• Linear bushings

• Linear ball bearings

• Ball screws

• Linear actuators

• Cross-roller systems

• Linear motion shafts

• Other linear motion components

The term THK linear bearing is therefore often used broadly when discussing THK linear motion products.

Before purchasing, it is important to identify the exact component required.

THK Linear Guideways

THK linear guideways are used to provide controlled linear movement between machine components.

A typical linear guideway consists of:

• Guide rail

• Linear guide block

• Rolling elements

The rolling elements move between the rail and block, allowing the block to travel along the rail with controlled friction.

Linear guideways can be used in:

• CNC machines

• Automation equipment

• Robotics

• Industrial machinery

• Precision positioning systems

• THK Linear Guide Blocks

The linear guide block travels along the THK guide rail.

The appropriate block depends on factors such as:

• Load capacity

• Rail size

• Mounting arrangement

• Preload

• Accuracy

• Travel requirements

Different block configurations are available for different machine designs.

When replacing a THK guide block, the complete product number is particularly important because two blocks with similar dimensions may have different specifications.

THK Linear Bearings and Linear Bushings

Linear bushings are used with precision shafts to provide linear movement.

They can be used in applications requiring a relatively simple linear motion arrangement.

Typical applications include:

• Small automation systems

• Packaging equipment

• Printers

• Laboratory equipment

• Small machinery

• Positioning mechanisms

When selecting a linear bushing, check both the bearing dimensions and the compatible shaft.

THK Linear Bearings vs Rotary Bearings

A common mistake is to assume that a conventional ball bearing can replace a linear bearing.

The two are designed for different types of movement.

Feature	THK Linear Bearing	Rotary Ball Bearing
Primary movement	Linear	Rotational
Movement path	Straight	Circular
Typical components	Rails, blocks, shafts	Inner and outer rings
Applications	CNC, automation, robotics	Motors, pumps, gearboxes
Main considerations	Load, stroke, accuracy, preload	Load, RPM, clearance, lubrication

The correct bearing depends on how the machine component is required to move.

Types of THK Linear Motion Products

1. Linear Guideways

Linear guideways provide precise movement along a rail.

They are widely used in machinery where rigidity and positioning accuracy are important.

2. Linear Guide Blocks

Guide blocks travel along the guide rail and carry the machine load.

They are available in different configurations depending on the required load, mounting arrangement and precision.

3. Linear Bushings

Linear bushings provide linear movement along a cylindrical shaft.

They are commonly used in simpler linear motion systems.

4. Ball Screws

Ball screws convert rotary motion into precise linear motion.

They are commonly used in:

• CNC machines

• Positioning systems

• Automation equipment

• Industrial machinery

5. Linear Actuators

Linear actuators provide controlled linear movement and can be used in automated machinery and positioning systems.

Benefits of THK Linear Bearings

1. Smooth Linear Motion

The rolling-element design allows components to move along a controlled linear path with low friction.

2. High Positioning Accuracy

Suitable THK linear motion systems can provide the precision required for demanding machinery.

3. High Rigidity

Linear guideways can provide the rigidity needed to support machine loads while maintaining controlled movement.

4. High Load Capacity

Different guideway sizes and configurations allow systems to be selected for different loads.

5. Low Friction

Rolling elements reduce sliding friction and can provide efficient movement.

6. Repeatable Motion

Properly selected and installed linear motion systems can support consistent movement and positioning.

THK Linear Bearing Sizes

THK linear products are available in different sizes and configurations.

For linear guideways, important dimensions can include:

• Rail width

• Rail height

• Block length

• Block width

• Mounting hole dimensions

• Rail length

For linear bushings, important dimensions may include:

• Shaft diameter

• Outer diameter

• Overall length

The exact dimensions depend on the product series.

This is why the complete THK product number is often the best starting point when identifying a replacement.

How to Choose the Right THK Linear Bearing

1. Identify the Product Type

First determine whether you need:

• Linear guideway

• Guide block

• Linear bushing

• Ball screw

• Linear actuator

• Another linear motion component

2. Determine the Load

Calculate or estimate the load carried by the linear motion system.

Consider:

• Static load

• Dynamic load

• Moment loads

• Shock loads

3. Check the Stroke

Determine how far the component needs to travel.

For example:

100 mm

500 mm

1,000 mm

2,000 mm

The required stroke affects rail and system selection.

4. Check Operating Speed

Determine the required linear speed.

High-speed applications require appropriate consideration of:

• Bearing design

• Lubrication

• Preload

• Rail configuration

5. Check Accuracy

Consider the machine's required positioning accuracy and repeatability.

Precision requirements can influence the guideway and preload selection.

6. Check Rigidity

Heavy machining and cutting applications can require higher rigidity than light-duty automation equipment.

7. Check Preload

Preload affects:

• Rigidity

• Friction

• Running characteristics

• Accuracy

The appropriate preload depends on the application.

8. Check Mounting Arrangement

Confirm:

• Available space

• Mounting holes

• Rail arrangement

• Block orientation

• Shaft configuration, where applicable

9. Check the Environment

Consider exposure to:

• Dust

• Metal particles

• Coolant

• Water

• Chemicals

• High temperatures

Machine tools, for example, can require stronger contamination protection than clean automation environments.

THK Linear Bearings for CNC Machines

CNC machines require precise and repeatable linear movement.

THK linear guideways can be considered for machine axes where the system needs to handle:

• Cutting forces

• High loads

• Repeated movement

• High positioning accuracy

• High rigidity

The correct guideway depends on the machine's:

• Axis load

• Travel length

• Speed

• Accuracy

• Rigidity requirements

For CNC applications, selecting a guide block only by rail size can result in an unsuitable configuration.

THK Linear Bearings for Automation

Automation equipment often requires frequent and repeatable movement.

THK linear motion components can be used in:

• Pick-and-place systems

• Assembly machines

• Packaging machines

• Inspection equipment

• Material-handling systems

For automation applications, factors such as speed, acceleration, stroke and cycle frequency become particularly important.

THK Linear Bearings for Robotics

Robotic systems can use linear motion components for positioning and movement along specific axes.

Depending on the machine design, linear guideways can provide:

• Controlled movement

• High repeatability

• Compact installation

• Suitable rigidity

• Low-friction operation

The product should be selected based on the robot's load, acceleration and positioning requirements.

THK Linear Bearing Maintenance

Proper maintenance can help extend the operating life of a linear motion system.

Lubricate Correctly

Use the appropriate lubricant and follow the recommended lubrication arrangement for the specific product.

Keep the Rail Clean

Remove contaminants such as:

• Dust

• Metal chips

• Coolant

• Dirt

before they reach the rolling elements.

Inspect Seals

Check seals for damage or excessive wear.

Damaged seals can allow contaminants to enter the guide system.

Check for Unusual Noise

Changes in running noise can indicate:

• Contamination

• Lack of lubrication

• Damage

• Misalignment

• Monitor Movement

Look for:

• Increased friction

• Jerky movement

• Increased vibration

• Positioning errors

These can indicate a developing problem.

Common Mistakes When Buying THK Linear Bearings

Choosing Only by Rail Size

Two products with similar rail dimensions can have different load ratings, preload and accuracy.

Ignoring the Guide Block

The block and rail need to be compatible.

Ignoring Load Moments

Linear systems can experience overturning moments in addition to direct loads.

Ignoring Stroke

The required travel affects the rail length and overall system design.

Ignoring Speed and Acceleration

High-speed and high-acceleration applications require appropriate product selection.

Ignoring Contamination

Dust, chips and coolant can significantly affect linear motion components.

Buying Without Checking the Product Number

The complete THK designation can provide critical information about the product configuration.

What to Actually Check Before You Buy

Before purchasing a THK linear bearing or linear motion component, don't simply provide the rail or shaft size.

1. Check the Existing THK Product Number

Look for the complete designation marked on the product.

2. Take a Clear Photograph

A photograph of the rail, block, bearing and markings can help identify the product.

3. Measure the Components

Depending on the product, measure:

• Rail width

• Rail height

• Block dimensions

• Shaft diameter

• Mounting hole spacing

• Overall length

4. Check the Application

Tell the supplier what machine the component is used in.

For example:

"This THK linear guide is used on the X-axis of a CNC machine."

5. Check the Load

Mention the approximate machine load and cutting or operating forces.

6. Check Stroke

Provide the required travel distance.

7. Check Speed

Mention the maximum linear speed and acceleration.

8. Check Accuracy

Tell the supplier the required positioning accuracy and repeatability.

9. Check the Environment

Mention whether the system is exposed to coolant, dust, chips or moisture.

10. Check the Complete Assembly

Make sure the rail, guide block, shaft and other components are compatible before purchasing.

Why Buy THK Linear Bearings From Kashyap Bearing?

When sourcing THK linear bearings in Bangalore, the challenge isn't simply finding a THK product with the correct dimensions.

The important part is matching the product series, guide rail, block configuration, load capacity, stroke, speed, accuracy, preload, mounting arrangement and operating environment to the actual machine.

At Kashyap Bearing, you can share your existing THK product number, photograph, dimensions, machine details or application requirements with the team.

This makes it easier to identify the appropriate linear motion component rather than selecting one based only on size.

Kashyap Bearing has been serving customers from SP Road, Bangalore since 1987, supplying a broad range of bearings and industrial products.

Whether you need THK linear motion products for a CNC machine, automation system, robotics application, packaging machine, machine tool, inspection system or industrial equipment, providing the actual application details can help narrow down the right product.

If you're unsure about the correct THK guide block, rail, linear bushing or other linear motion component, speak with the Kashyap Bearing team before purchasing.

The right linear bearing isn't simply the product with the correct dimensions. It is the product that correctly matches the machine's load, stroke, speed, accuracy, rigidity and operating environment.

Frequently Asked Questions

What are THK linear bearings?

THK linear bearings generally refer to THK linear motion components used to provide controlled movement along a straight path. These can include linear guideways, guide blocks and linear bushings.

What are THK linear bearings used for?

They can be used in CNC machines, machine tools, automation equipment, robotics, packaging machinery, inspection systems and other industrial applications requiring controlled linear movement.

What is a THK linear guideway?

A THK linear guideway consists of a guide rail and a linear guide block that travels along the rail using rolling elements.

What is the difference between a THK linear guide and a linear bushing?

A linear guide typically uses a rail and guide block, while a linear bushing generally travels along a cylindrical shaft. The appropriate system depends on the machine design and performance requirements.

How do I choose a THK linear bearing?

Check the product type, load, stroke, speed, accuracy, rigidity, preload, mounting arrangement, dimensions and operating environment.

Are THK linear bearings suitable for CNC machines?

Yes, suitable THK linear motion products can be used in CNC machines where controlled, precise and repeatable linear movement is required.

How do I identify a THK linear bearing?

Start with the complete THK product number. If the number isn't available, provide clear photographs and measurements of the rail, block or shaft.

What information should I provide when buying a THK linear bearing?

Ideally provide the product number, dimensions, machine type, load, stroke, speed, accuracy requirements and operating environment.

Where can I buy THK linear bearings in Bangalore?

You can contact Kashyap Bearing on SP Road, Bangalore for THK linear motion product requirements. Share the product number, dimensions or application details so the appropriate component can be identified.

Final Word

THK linear bearings and linear motion systems are designed for applications where controlled, accurate and repeatable linear movement is required.

From linear guideways and guide blocks to linear bushings and other motion components, different THK products are available for different machine requirements.

Choosing the right THK product isn't simply about matching the rail or shaft dimensions.

Before purchasing, check the product number, dimensions, load, stroke, speed, accuracy, rigidity, preload, mounting arrangement and operating environment.

If you're replacing an existing component, start with the complete THK designation and take clear photographs of the product. If you're selecting a linear motion system for a new machine, provide the supplier with the load, stroke, speed and accuracy requirements.

And if you're unsure which THK linear bearing or linear motion component is right for your application, Kashyap Bearing can help you narrow down the appropriate options. Share your product number, dimensions or application requirements with the team before purchasing so you can select a component that actually matches your machine rather than choosing one based only on size.