Copper Key Size Chart: Because Size Does Matter (When It Comes to Opening Your Door)

As humans, we tend to ignore the size of things until it becomes a roadblock. And, when it comes to keys, it is only when we can’t open the door, we start paying attention to its size. And, in most cases, we blame the lock or curse our luck, without realizing that the problem might be the key, the shape or the size. This is why the Copper Key Size Chart is the ultimate cheat sheet for everyone who wants to make sure they have the key that fits.

How to Use the Copper Key Size Chart

The Copper Key Size Chart is straightforward and easy to use. All you need to do is get a ruler and measure the key from the tip to the end, excluding the part that goes into the lock. Once you have the size, compare it to the chart to find the perfect match.

The Importance of the Correct Key Size

Having the right key size is crucial for a variety of reasons. If the key is too small, it won’t engage with the lock’s mechanism, making it impossible to unlock. Conversely, a key that’s too big will not fit in the lock, making it impossible to open. Additionally, using the wrong size key can damage the lock, which can be an expensive repair.

The Science Behind Key Sizes

Keys come in a wide range of sizes, shapes, and designs. But why do they vary in size? The answer lies in the lock’s mechanism. Locks have pins that need to be in a specific position before the lock can be turned. The size of the key determines the position of these pins.

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The Ultimate Advantages of the Copper Key Size Chart

There are plenty of advantages of using the Copper Key Size Chart. Here are just a few:

  1. Saves time – No more trying out every key on your keyring to find the right one.
  2. Avoids damage – Using the wrong key size can cause damage to the lock, but with the chart, you can avoid that.
  3. Saves money – Avoiding damage to the lock can save you a lot of money in the long term.
  4. Better security – A key that’s the right size will provide better security, ensuring that the lock works as it should.

Understanding Key Blank Manufacturers

There are a few key blank manufacturers who dominate the market due to their excellent product designs and quality. Here are two of the most prevalent in the industry:

Kaba Ilco

Kaba Ilco is a global leader in the key blank industry. The company provides a wide range of key blanks for different kinds of locks. They are sold in over 100 countries worldwide, and the company’s product line includes:

  • Commercial key blanks
  • Automotive key blanks
  • Household key blanks
  • Safe deposit key blanks


JMA is another major player in the key blank industry. Founded in Spain in 1973, the company has grown to become one of the leading manufacturers of key blanks globally. JMA products are distributed in over 80 countries and are popular for their high-quality standards. The company produces key blanks for numerous applications, including:

  • Automotive keys
  • Residential keys
  • High-security keys
  • Motorcycle keys

Copper Key Size Chart – The Perfect Solution for Locksmiths

Locksmiths will find the Copper Key Size Chart to be a valuable tool in their trade. With the chart, they can quickly and accurately determine the key size their clients need, providing them with instant solutions. The chart also helps avoid any damage to the lock, which locksmiths know can be an expensive problem.

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It’s Not Just About the Size, but the Shape Too

While the size of the key is important, so is the shape. The key’s shape determines how it engages with the lock’s pins or tumblers. A key with the wrong shape won’t turn the lock, even if it is the right size.

Other Factors to Consider When Choosing a Key

Aside from size and shape, there are other factors to consider when choosing a key. Here are some of the most important ones to keep in mind:

  1. Material- Keys can be made from different materials, including brass, steel, and other alloys.
  2. Security – Modern keys can come with features like bump proof and high security, which provide more protection against lock picking and bumping.
  3. Duplication – Some keys can be duplicated quickly, while others are more challenging to reproduce.

Best Tips for Choosing a Great Key

Choosing the right key is crucial, but it can be challenging with so many options available. Here are some tips to help you make the best decision:

  • Check the Copper Key Size Chart to ensure you have the correct size.
  • Look for keys made by reputable manufacturers.
  • Opt for keys that come with security features.
  • Choose keys that can be duplicated easily, but not too easily.

Copper Key Size Chart Table

Size (mm) Key Type
56 A
57 B
58 C
59 D
60 E
61 F


A small key can have a huge impact on your security and convenience. Understanding the right key size and shape is critical to keep your doors safe and sound. The Copper Key Size Chart can be an invaluable tool to make sure you have the right key for the job. From locksmiths to everyday people, anyone can benefit from the chart, and it’s easy to use. So, the next time you’re struggling to unlock your door, remember – size matters!

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  • “Key Sizes and Key Types.” Bay Area Locksmith, 24 Mar. 2021,
  • “Kaba Ilco.” Kaba Ilco,
  • “JMA.” JMA USA,