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Crush Washer vs Washer – What’s the Difference

Crush Washer vs Washer

Regarding plumbing fittings, washers are a crucial component that serves various purposes. From supporting and sealing a connection to preventing leaks, washers ensure smooth and efficient plumbing operations. However, choosing the right type of washer can be daunting, especially with the multiple options. Two of the most common types of washers are crush and regular washers. In this blog post, we will explore the differences and help you decide which is better suited for your plumbing needs.

What is Crush Washer?

Crush washers are disc-shaped metal washers, usually made from aluminium or copper. They are most commonly used in automotive and aircraft applications but have also gained popularity in plumbing fittings. Crush washers get their name from their design, which involves crushing and deforming the metal to create a seal. When an adequately tightened bolt or nut presses down on a crush washer, it deforms and forms a leak-proof seal.

What is a Regular Washer?

A regular washer, or flat washer, is a thin, flat, and disc-shaped component typically made from metal or plastic. They come in various sizes and are designed to fit underneath nuts, screws, or bolts. Regular washers are used to distribute the pressure of a fastener uniformly, protect delicate surfaces, and prevent loosening, among other functions. They are cheaper and more readily available than crush washers.

Differences Between Crush Washers and Regular Washers

The main difference between the two washers is their design and function. Regular washers offer minimal compression and rely on friction to create a seal. On the other hand, crush washers are designed to compress, deform, and seal when tightened. Crush washers offer a more robust and secure seal than regular washers, especially in high-pressure applications. However, they can only be used once and must be replaced each time they are removed.

Choosing the Right Washer for Your Plumbing Needs

Choosing the right type of washer for your plumbing needs depends on several factors. Crush washers are better for working on a high-pressure system, such as a hydraulic line or oil filter. They provide a more reliable seal to withstand high pressure and extreme temperatures. However, regular washers will suffice if you work on a low-pressure system, such as a garden hose or faucet. They are cheaper, easier to find, and can be reused.


In conclusion, crushes and regular washers are used in plumbing fittings. Choosing the right one depends on the application, pressure and temperature rating, and your personal preference. After reading this blog post, we hope you better understand the differences between the two washers and can make an informed decision when purchasing one. Always inspect your washers regularly and replace them as needed to ensure the best possible performance from your plumbing system.

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