Space and depth keys are specialized locksmith tools used to help identify and measure the position and depth of cuts on a key. They are commonly used with compatible key systems when decoding or determining the correct key-cut specifications.
Unlike a standard key blank, which is intended to be cut into a working key, space and depth keys are designed as reference tools. They help locksmiths understand the relationship between the locations of cuts and their corresponding depths.
What Are Space and Depth Keys Used For?
Space and depth keys are primarily used in professional locksmithing and key-service work to identify key-cut information.
They can help locksmiths:
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Determine the spacing of key cuts
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Identify available cut depths
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Compare a key against known specifications
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Determine appropriate key-cut information for compatible systems
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Assist with key origination and duplication work
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Work with code-cutting and key-cutting equipment
The exact application depends on the vehicle or lock system and the specific space-and-depth key set.
How Do Space and Depth Keys Work?
A space-and-depth system separates two important measurements found in a key's cutting pattern:
Space refers to the location of an individual cut along the key blade.
Depth refers to how far that cut is made into the blade.
A key can therefore be described using a series of positions and corresponding cut depths.
For example, a locksmith may have a reference system showing several possible cut positions and several available depth levels. By comparing the key with the appropriate reference tool or specification, the locksmith can identify the relevant cutting information for an authorized key-making job.
The actual spacing and depth values differ between key systems.
How to Use Space and Depth Keys
Space and depth keys should be used with the correct manufacturer's or key-system reference information. They are not universal tools, and a set designed for one key family may not apply to another.
For legitimate locksmithing work, the general process is:
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Identify the key system. Confirm the make, model, keyway, or other applicable identification information.
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Select the correct space-and-depth set. Use a set designed for that particular system.
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Match the spacing positions. Use the reference key or gauge to identify the locations of the cuts along the blade.
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Compare the cut depths. Determine which depth corresponds to each cut position using the applicable reference.
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Record the cutting information. The resulting information can be used with compatible key-cutting equipment or manufacturer's specifications.
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Cut an authorized key. Use the identified specifications with the appropriate blank and key-cutting machine.
The exact procedure varies by key system, so the manufacturer's code series, spacing/depth chart, or equipment documentation should be followed.
What Is Key Spacing?
Key spacing describes the distance between the individual cut positions along a key blade.
Each key system can use a specific number of possible cut positions. The positions need to be correctly identified because moving a cut even slightly can produce an incorrect key.
Space-and-depth references allow locksmiths to distinguish these positions when working with compatible key systems.
What Is Key Depth?
Key depth describes how far a cut extends into the key blade.
Different key systems use different numbers of depth levels. A shallow cut and a deeper cut represent different values in the manufacturer's key-cut specification.
The combination of spacing and depth information creates the cutting pattern for a particular key.
Are Space and Depth Keys Universal?
No. Space and depth keys are generally system-specific.
Different manufacturers and key families can use different:
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Number of cut positions
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Spacing dimensions
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Depth increments
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Blade profiles
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Reference systems
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Code series
A tool that works with one key system should not automatically be assumed to work with another.
Where Are Space and Depth Keys Used?
Space and depth tools can be used in professional key-service environments, including:
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Locksmith shops
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Automotive locksmith operations
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Key-cutting businesses
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Automotive service facilities
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Security hardware workshops
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Key origination and duplication work
Their application depends on the particular key system and the type of key-cutting equipment being used.
Why Are Space and Depth Keys Important?
Accurate spacing and depth are essential when producing a key. If a cut is positioned incorrectly or made to the wrong depth, the resulting key may not operate the intended lock.
Space-and-depth tools provide locksmiths with a structured way to reference these measurements, helping support accurate key origination, duplication, and servicing.
What Should You Consider When Choosing Space and Depth Keys?
Before purchasing a space-and-depth set, verify:
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The intended key system
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Compatible makes and models
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Number of included reference keys
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Available spacing positions
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Available depth levels
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Compatibility with your key-cutting equipment
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Manufacturer documentation
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Whether the set is intended for residential, commercial, or automotive applications
Choosing a set based only on its appearance can result in incompatibility. The key system and specifications should be confirmed first.
