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What Is a Clotter Pin?

  • March 18, 2020

It’s not uncommon for bolts to loosen over time. If a bolt is attached to a machine, for instance, the vibrations produced by the machine may cause it to come out. There are ways to secure bolts in place, however, including the use of a clutter pin. But what exactly is a clotter pin?

The Basics of Clotter Pins

Also known as a split pin, a clotter pin is a simple fastener that’s used to secure a bolt — or any other rod-shaped fastener — in place. As shown in the adjacent image, clotter pins consist of a narrow U-shaped piece of metal with a flared and circular top. Clotter pins are inserted into a bolt to prevent the bolt from loosening.

How Clotter Pins Work

Clotter pins work by preventing the bolt in which they are inserted from coming out. Of course, not all bolts support the use of a clotter pin. Rather, you can only insert a clotter pin into a bolt if the bolt has a hole in it. Without a hole, there’s nowhere to insert a clotter pin. Therefore, you’ll need to choose a bolt with a pre-drilled hole if you’re planning to secure it using a clotter pin. You can always try to drill a new hole into an existing bolt, but there are bolts available that are designed specifically for use with a clotter pin. They already have a pre-drilled hole, allowing for faster and easier installation of a clotter pin.

To use a clotter pin, simply place it through the bolt’s hole. Next, you’ll need to twist the two prong-like ends of the clotter pin outwards and away from each other. Some people assume that it’s best to twist the ends of clotter pins together, but this simple fastener offers the greatest protection against loosening when the ends are twisted away from each other. Using this technique, the clotter pin is less likely to wiggle its way out of the bolt — something that could otherwise cause the bolt to come out as well.

In Conclusion

A clotter pin is a simple fastener that’s used to secure a bolt in place. Consisting of a U-shaped piece of metal, it’s inserted through the hole of a bolt, after which the ends are twisted together. The clotter pin secures the bolt in place so that it’s less likely to loosen and come out.

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