Linear Guides
Verified by Mel Sykes, Industrial Supply Chain Specialist - April 2026
| Specification | Details |
|---|---|
| Types | Ball type (most common), roller type (heavy load), miniature |
| Rail sizes | 7mm to 65mm width |
| Accuracy | Normal, High (H), Precision (P), Super Precision (SP) |
| Standards | ISO 14728 |
| Brands | THK, Hiwin, Bosch Rexroth, IKO, NSK |
What are Linear Guides?
Linear guides are precision components used in machinery to provide smooth and accurate linear motion. They consist of a rail with rolling elements-typically balls or rollers-that reduce friction between the guide and its carriage.
Types and variants
Linear guides come in various types, each designed for specific applications based on load capacity and accuracy requirements:
- Ball Type: The most common type, featuring ball bearings to ensure smooth motion. Available in sizes from 7mm to 65mm wide.
- Roller Type (Cylindrical Roller): Ideal for heavy loads due to the larger contact area of cylindrical rollers. Commonly used in machinery with high static and dynamic load requirements.
- Miniature: Designed for compact applications where space is limited, typically found in sizes below 16mm.
Materials and specifications
Linear guides are made from a variety of materials to suit different environments:
- Stainless Steel (AISI304/316L): Resistant to corrosion and suitable for cleanroom applications.
- Chrome Plated Carbon Steel: Provides good wear resistance and is cost-effective. Commonly specified as EN8 carbon steel.
Standards such as ISO 14728 ensure that Linear Guides meet specific performance criteria:
- ISO 14728 outlines the design, testing, and marking of linear guides, ensuring consistency across different brands like THK, Hiwin, Bosch Rexroth, IKO, and NSK.
Selection criteria
Choosing the right Linear Guide involves several factors:
- Load Capacity: Determine the maximum load your application will handle to select a guide with an adequate rating. - Precision Requirements: Select guides based on accuracy grades-normal (N). High (H), precision (P), super precision (SP)-to meet specific tolerance needs. - Environmental Conditions: Consider temperature ranges and humidity levels when choosing materials like stainless steel for corrosive environments.
UK suppliers
MLC lists verified Linear Guide suppliers that are registered with Companies House, ensuring reliability:
- Suppliers include Ball Bearing and Machinery Co. Ltd (CBM), British Industrial Fasteners Association Distributors (BIAFD), and other reputable trade bodies.
- You can find a full list on the MLC website.
Common applications
Linear Guides are widely used in various industries for their precision and efficiency:
- Robotics: Used in robotic arms and end-effectors to ensure precise movement.
- Machine Tools: In CNC machines where accuracy is critical, linear guides provide reliable positioning.
- Automotive Industry: Applied in assembly lines and testing equipment to maintain consistent quality control.
For optimal performance, always consult the manufacturer's data sheets for specific dimensions, load ratings, and environmental conditions. For instance, THK's HGR series has a maximum load capacity of up to 25kN and operates effectively within a temperature range from -40°C to +80°C.
References
Frequently Asked Questions
What are Linear Guides?
Linear Guides are engineering components used in industrial applications. Browse verified UK suppliers on MLC.
Where can I buy Linear Guides in the UK?
MLC lists verified UK linear guides suppliers with Companies House data. Browse by product category or search by location.
What are Linear Guides and what are their primary functions?
Linear guides are precision components used in machinery to provide smooth and accurate linear motion. They consist of a rail with rolling elements-typically balls or rollers-that reduce friction between the guide and its carriage, ensuring efficient operation.
What types of Linear Guides are available, and which one is most commonly used?
The main types of Linear Guides include ball type, roller type (cylindrical roller), and miniature. Ball type guides are the most common due to their versatility and effectiveness in reducing friction for smooth motion.
How do I choose between ball and roller type Linear Guides?
When choosing between ball and roller type Linear Guides, consider your load requirements. Ball types are suitable for general applications, while roller types are better suited for heavy loads because of their larger contact area which provides higher load capacity.
What standards should be considered when selecting Linear Guides in the UK?
ISO 14728 is a key standard to consider when selecting Linear Guides in the UK. This standard ensures that guides meet specific performance criteria, helping engineers choose components that comply with international quality and performance benchmarks.
Can you recommend some reputable brands for Linear Guides in the UK?
Leading brands of Linear Guides available in the UK include THK, Hiwin, Bosch Rexroth, IKO, and NSK. These suppliers offer a wide range of products suitable for various industrial applications.
What are the accuracy levels offered by Linear Guide manufacturers?
Manufacturers provide different accuracy grades for Linear Guides, including normal, high (H), precision (P), and super precision (SP) options. The choice depends on the required level of motion accuracy in your application.
How do I determine the appropriate rail size for my Linear Guide system?
Rail sizes for Linear Guides range from 7mm to 65mm width, depending on the load capacity and space constraints of your machinery. Selecting an appropriate rail size involves balancing these factors to ensure efficient operation and longevity.
What are some factors affecting the cost and availability of Linear Guides in the UK market?
The cost and availability of Linear Guides in the UK can vary based on brand, accuracy level, type (ball or roller), and supplier. Factors such as demand for specific sizes and custom orders also impact pricing and stock levels.