A roller chain offset link, also known as a half link or crank link, is a type of link that is used to add a half link to a strand of roller chain. Roller chains are typically made up of an even number of links, so an offset link is necessary if you need to create a chain with an odd number of links. Offset links are made up of two offset side plates, one roller, one bushing, and one pin with a cotterpin. The side plates are offset by half of a pitch, which allows the link to add half of a pitch to the overall length of the chain.
What is a Roller Chain Offset Link Used For?
Offset links are used in a variety of applications, including:
- Adjusting the length of a roller chain: Offset links can be used to adjust the length of a roller chain to fit a specific application. For example, if you need to shorten a roller chain by one pitch, you can use an offset link.
- Creating a roller chain with an odd number of links: Offset links can be used to create a roller chain with an odd number of links. This is necessary for some applications, such as bicycle chains.
- Making repairs to a roller chain: Offset links can be used to make repairs to a damaged roller chain. For example, if a link in a roller chain breaks, you can replace it with an offset link.
Advantages and Disadvantages of Using Roller Chain Offset Links
There are both advantages and disadvantages to using roller chain offset links.
Advantages:
- Offset links are relatively inexpensive and easy to install.
- Offset links can be used to adjust the length of a roller chain or create a roller chain with an odd number of links.
- Offset links can be used to make repairs to a damaged roller chain.
Disadvantages:
- Offset links are weaker than standard roller chain links.
- Offset links can reduce the lifespan of a roller chain.
When to Use Roller Chain Offset Links
Offset links should only be used when necessary. If possible, it is best to design your application to avoid the use of offset links. However, there are some applications where offset links are necessary due to space limitations.
If you do need to use offset links, be sure to use the correct size and type of offset links for your application. You should also inspect the offset links regularly for signs of wear and tear.
How to Install a Roller Chain Offset Link
To install a roller chain offset link, follow these steps:
- Remove the cotter pin from the offset link.
- Separate the two side plates of the offset link.
- Position the offset link in the roller chain, with the offset side plates on the same side as the offset side plates of
- the surrounding links.
- Slide the pin through the offset link and the surrounding links.
- Insert the cotter pin through the hole in the pin and bend the ends of the cotter pin to secure it. The cotter pin ends shoud never ben bent past the height of the plate.
Offset Links for Specific Chain Categories
ANSI Roller Chain Offset Links
ANSI roller chain offset links are used to adjust the length of ANSI roller chains. They are available in a variety of sizes to match different ANSI roller chain sizes.
To purchase ANSI roller chain offset links, please visit the following category page:

Metric Roller Chain Offset Links
Metric roller chain offset links are used to adjust the length of metric roller chains. They are available in a variety of sizes to match different metric roller chain sizes.
To purchase metric roller chain offset links, please visit the following category page:
Corrosion Resistant Roller Chain Offset Links
Corrosion resistant roller chain offset links are used to adjust the length of corrosion resistant roller chains. They are made from durable materials that are resistant to corrosion.
To purchase corrosion resistant roller chain offset links, please visit the following category page:
Conveyor Roller Chain Offset Links
Conveyor roller chain offset links are used to adjust the length of conveyor roller chains. They are designed to withstand the high loads and harsh environments that conveyor roller chains are often subjected to.
To purchase conveyor roller chain offset links, please visit the following category page:
Conclusion
Roller chain offset links are a useful tool for adjusting the length of a roller chain, creating a roller chain with an odd number of links, and making repairs to a roller chain. However, offset links should only be used when necessary, as they are weaker than standard roller chain links and can reduce the lifespan of a roller chain drive.