ThePipingMart Blog Fasteners Star Lock Washers: Understanding its Advantages and Disadvantages

Star Lock Washers: Understanding its Advantages and Disadvantages

Star Lock Washers: Understanding its Advantages and Disadvantages

When it comes to fastening two pieces of material together, there are endless possibilities – screws, nuts, bolts, and washers. Washers come in different types, and one of them is the star lock washer. Star lock washers, also known as external tooth lock washers, are designed to prevent bolts and nuts from loosening. They consist of teeth that bite the material, preventing the fastener from slipping. However, star lock washers have advantages and disadvantages like any other product. In this post, we’ll explore the pros and cons of star lock washers to help you determine if they’re the right choice for your next project.

What is Star Lock Washers?

Star lock washers, also known as star washers or internal tooth lock washers, are a type of locking washer used in various industries for fastening and securing purposes. They are characterized by their unique design, which features small teeth on the inner surface that dig into the mating surface, providing a strong grip and preventing the loosening of the fastener.

These innovative washers come in different sizes to fit different types of screws and bolts. The most common materials for manufacturing star lock washers include steel, stainless steel, and brass. Due to their corrosion resistance, this makes them suitable for indoor and outdoor applications.

One notable feature of star lock washers is their versatility in use. They can be used with anything from wood to metal surfaces, making them ideal for construction, automotive repairs, plumbing work, and many more.

The main purpose of using star lock washers is to prevent nut loosening caused by vibrations or changes in temperature. As these factors can cause normal nuts to become loose over time, using a reliable locking mechanism such as a star lock washer is crucial when dealing with critical components that require secure fastening.

Advantages of Star Lock Washers

Resistant to Loosening:

Star lock washers are primarily designed to prevent fasteners from working themselves loose. Unlike regular washers, a star lock washer has teeth or serrations on the outside edge that grip into the material, providing a secure fit and reducing the chances of loosening over time.

Durable and Long Lasting:

Star lock washers are made from robust materials, such as stainless steel, which makes them corrosion-resistant and durable. They can withstand extreme temperatures and harsh environments, making them perfect for outdoor use.

Easy to Install:

Installing star lock washers is straightforward. You only need to place the washer between the nut and the material and tighten the fastener. The teeth or serrations on the washer will dig into the material, ensuring a tight fit and a lasting hold.

Disadvantages of Star Lock Washers

Can Damage Soft Materials:

The teeth on the outside edge of the washer can dig into the material, damaging soft surfaces like plastic or some metals. If you’re working with soft materials, consider using a nylon, plastic, or fiber washer instead.

Limited Reusability:

Star lock washers are designed for use as a one-time fastening solution. They are not meant to be reused, as the teeth or serrations get worn out. If you need to reuse the bolt and nut, consider using a plain or spring washer.

Extra Costs:

Star lock washers are slightly more expensive than regular washers due to their complex design. However, the extra cost is worth it for applications where preventing loosening is essential.


Star lock washers are a great option for applications that require a secure, long-lasting fastening solution. They are resistant to loosening, durable, and easy to install. However, they have drawbacks, such as being liable to damage soft materials and limited reusability. Ultimately, the pros and cons of star lock washers depend on your specific application and needs. We hope this post has given you a better understanding of star lock washers, and you can now make an informed decision about whether or not to use them in your next project.

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