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Crush Washer vs Sealing Washer – What’s the Difference

Crush Washer vs Sealing Washer

A good seal is essential for a fluid system or pipe connection. Many must realize that different kinds of washers can help achieve a perfect seal in different connections. Specifically, it’s important to understand the difference between crush washers and sealing washers. In this blog post, we’ll explain the differences between these two types of washers so that you can make the right choice for your needs.

What is Crush Washer?

A crush washer is a type of washer that is designed to seal the connection against leaks by deforming under pressure. As the name suggests, the washer is designed to be “crushed” between two metal surfaces, creating a tight and secure seal. Crush washers are commonly used in automotive and plumbing applications.

What is a Sealing Washer?

On the other hand, a sealing washer is a type that seals the connection by compressing a soft rubber or plastic ring. Unlike a crush washer, which deforms under pressure, a sealing washer is designed to maintain its shape and provide a consistent, reliable seal. Sealing washers are commonly used in electrical and plumbing applications.

Difference Between Crush Washer and Sealing Washer

When to use a Crush Washer?

Crush washers are best suited for high-pressure applications where the connection is subject to extreme forces. Examples include brake lines and fuel lines in a car. Crush washers are also used in plumbing and HVAC applications where leaks must be avoided because they are designed to create a tight, unbreakable seal.

When to use a Sealing Washer?

Sealing washers are best suited for applications where the connection is subject to vibration or movement. For example, a sealing washer may be used in an electrical connection subject to frequent flexing or bending. Because the rubber or plastic ring is flexible, it can absorb movement or vibration without breaking the seal. Sealing washers are also popular in faucet and showerhead installations as they provide a good seal with minimal torque applied to the fitting.

Which one should you use?

Choosing the right type of washer comes down to the specific application. If you’re working with high-pressure fluid connections, a crush washer is the way. If you’re working with something that requires a more flexible sealing solution, like electrical connections or a showerhead installation, a sealing washer is the way to go.


There is no one-size-fits-all solution when it comes to choosing washers. It’s important to consider the type of connection, the pressure, and the environment in which the connection will be used to make the right choice. We hope this guide has helped you understand the difference between crush and sealing washers and how to use them properly. Remember, choosing the right washer for the job is essential to keeping your connections tight, secure, and leak-free.

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