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Advantages and Disadvantages of External Tooth Washer

Advantages and Disadvantages of External Tooth Washer

When it comes to fasteners, one often overlooked component is the trusty washer. But washers are critical for maintaining bolt tension and preventing fasteners from loosening. If you’re in the market for washers, consider the external tooth washer. Here, we’ll explore the advantages and disadvantages of using external tooth washers.


Enhanced Stability:

External tooth washers provide better stability and prevent the loosening of the fasteners. They act as a locking mechanism, providing extra security to the fastening system. The teeth on the washer ensure that the bolt or nut is held firmly, making it challenging for it to come undone.


One of the primary benefits of external tooth washers is that they are cost-effective. They are cheaper than other locking devices, such as nylon inserts and lock nuts, making them popular among many industries.

Anti-Vibration Properties –

External tooth washers are excellent at reducing vibrations from mechanical operations and can help keep nuts and bolts tightly secured. This is especially important in machinery that needs to work quietly, as vibrations can cause noise pollution.

Uniform Tensioning:

External tooth washers ensure uniform tightening of the nuts or bolts. This helps avoid any damages caused by over-tightening, which can deform the components, bolts, and nuts.

Tightens Loose Bolts –

Over time, bolts can become loose due to vibration or heat. External tooth washers can help fix this by providing additional pressure to hold them tight. It means you’ll have to spend less time tightening various machinery components and decrease maintenance time and effort.

Easy to Install –

External tooth washers are easy to install compared to other washers. Unlike spring washers, they don’t require flattening and are easy to slip onto the bolt before installation.


Wear and Tear:

External tooth washers can cause wear and tear on the bolt or nut because of the constant pressure applied to the fastening system. This wear and tear reduces the overall life of the fastening system, and the washer itself may need replacement frequently.

Risk of Corrosion:

The material used for external tooth washers can be susceptible to corrosion, especially if exposed to moisture or chemical substances. This makes them less durable than other locking devices.

Damage Potential –

External tooth washers have sharp teeth that can damage soft surfaces. This means they could be better for delicate materials like plastic or precious metals. If you need to use washers in such materials, you’ll need to use flat washers or double coil washers instead.

Limited Stability –

While external tooth washers are excellent for vibration reduction, they aren’t as stable as other types of washers for load-bearing applications. They are not the best option if you fasten load-bearing applications.

Surface Finish Problems –

The sharp edges of external tooth washers can cause issues with surface finish. The washer could scratch the appearance of delicate surfaces. Thus, to avoid such problems, you need to consider using a flat washer without teeth.


In conclusion, external tooth washers are great engineering components with advantages and disadvantages. They are perfect for applications that require anti-vibration properties and are easy to install. However, there are better options than they if you must fasten load-bearing applications or place the washer on delicate surfaces. Ultimately, the type of washer you install will depend on your needs and application requirements. We hope this article has answered whether external tooth washers fit your needs.

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