Roller Chains
Verified by Mel Sykes, Industrial Supply Chain Specialist - April 2026
| Specification | Details |
|---|---|
| Pitches | 6.35mm (04B) to 76.2mm (48B) |
| Standards | BS ISO 606, ANSI B29.1 |
| Types | Simplex, duplex, triplex, attachment chains |
| Brands | Renold, Tsubaki, Iwis, Donghua |
What are Roller Chains?
Roller chains are mechanical components used to transmit power and motion in machinery. They consist of a series of linked inner and outer plates with cylindrical rollers that rotate as the chain moves. These chains are integral parts of conveyor systems, bicycles, motorcycles, and industrial equipment.
Types and variants
Roller chains come in various types based on their pitch size and configuration:
- Simplex: Single-row chain commonly used for light to medium-duty applications.
- Duplex: Two simplex chains connected side-by-side with a special connecting link, providing higher load capacity. Pitch sizes range from 6.35mm (04B) to 76.2mm (48B).
- Triplex: Three simplex chains combined for even greater load-carrying capacity.
- Attachment Chains: Used in conveyor systems where the chain forms part of a frame or support structure.
Materials and specifications
Roller chains are made from high-strength materials such as carbon steel, stainless steel, and brass. Common grades include EN8 carbon steel, A2-70 stainless steel, and phosphated or coated versions for corrosion resistance. Standards such as BS ISO 606 and ANSI B29.1 define the dimensions and load ratings for different chain types.
Selection criteria
Choosing the right roller chain involves considering factors like required tensile strength, pitch size, speed capacity, and environmental conditions. Engineers must match the chain's specifications to the application's power transmission requirements. For example, a simplex chain might suffice for light-duty machinery, while a triplex chain would be necessary for heavy industrial applications.
UK suppliers
MLC lists verified suppliers from Companies House that adhere to industry standards set by trade bodies such as CBM (Chain and Sprocket Manufacturers Association) and BIAFD (British Industrial Fasteners Association). These suppliers offer chains in various grades, sizes, and coatings to meet different application needs. For example, Renold offers high-strength carbon steel chains suitable for industrial machinery.
Common applications
Roller chains find use across multiple industries:
- Bicycles: Used in drivetrains to transfer power from pedals to the rear wheel.
- Agriculture: Employed in conveyor systems and harvesters for material handling.
- Manufacturing: Integral part of assembly lines, lifting equipment, and robotic systems.
- Marine: Found in propulsion systems on small boats and ships.
Roller chains are critical components that ensure efficient power transmission and reliability in diverse machinery.
References
Frequently Asked Questions
What are Roller Chains?
Roller Chains are engineering components used in industrial applications. Browse verified UK suppliers on MLC.
Where can I buy Roller Chains in the UK?
MLC lists verified UK roller chains suppliers with Companies House data. Browse by product category or search by location.
What are roller chains and where are they commonly used?
Roller chains are mechanical components used to transmit power and motion in machinery, consisting of linked inner and outer plates with cylindrical rollers. They're integral parts of conveyor systems, bicycles, motorcycles, and industrial equipment.
What types of roller chains exist based on their pitch size and configuration?
Roller chains come in simplex (single-row), duplex (two simplex chains side-by-side for higher load capacity), triplex (three simplex chains combined for even greater load-carrying capacity), and attachment chains used specifically in conveyor systems.
How do you determine the appropriate roller chain type for an application?
The choice of roller chain type depends on the required load capacity, speed, and environmental conditions. Simplex chains are suitable for light to medium-duty applications, while duplex and triplex chains handle heavier loads. Attachment chains are used in conveyor systems where structural support is needed.
What standards do roller chains adhere to?
Roller chains comply with international standards such as BS ISO 606 and ANSI B29.1, ensuring compatibility and performance across different applications.
Which UK brands supply roller chains?
Notable UK suppliers of roller chains include Renold, Tsubaki, Iwis, and Donghua, providing a range of high-quality products suitable for various industrial needs.
What is the pitch size range for standard roller chains?
Standard roller chains have pitches ranging from 6.35mm (04B) to 76.2mm (48B), catering to different load and speed requirements in machinery applications.
How do you ensure proper maintenance of roller chains?
Regular lubrication and inspection are important for maintaining the performance and longevity of roller chains, preventing wear and ensuring smooth operation.
What factors influence the cost and availability of roller chains in the UK market?
The cost and availability of roller chains in the UK depend on brand, type, pitch size, and demand. Simplex chains are generally more readily available than specialty types like attachment or triplex chains due to their widespread use in industrial applications.