📖 LESSON PREVIEW — module: Module 3 Automotive And Business
Key Cutting by Code and VIN
What You’ll Learn
How to decode key numbers from vehicle VINs and lock core codes
Step-by-step key cutting procedures using codebooks and digital databases
Verification techniques to ensure cut keys work without trial-and-error
Common pitfalls when working with automotive and residential key systems
Key Cutting by Code and VIN: Core Procedures
In automotive and residential locksmithing, cutting a key from code or VIN demands precision and access to the right tools. Start by locating the vehicle’s key code—often stamped on the driver’s side door jamb, glove box, or under the dashboard. For VIN-based cuts, use a VIN decoder (paid or free) to extract the key code. Cross-reference this code with a manufacturer-specific codebook or online database like KeyCodeFinder to determine the bitting pattern. Always verify the code against the vehicle’s title or insurance records to avoid using stolen data.
Once you have the 5-7 digit bitting pattern, select the correct key blank. Automotive systems like GM, Ford, or Chrysler use proprietary blanks (e.g., GM “954” or Ford “1D”), while residential systems like Schlage or Kwikset have standard blanks. Load the blank into your key cutter, align the bittings with the code (note left-to-right orientation), and adjust the cutter depth per the system’s specifications. For example, a GM 954 blank requires a .062” depth per cut, measured from the base of the blank. After cutting, test the key in the ignition or lock. If it fails, double-check the code for transposition errors or use a key gauge to measure the cut depths against the codebook specs.
Critical Verification Steps
Never assume a cut key works until it’s tested. For automotive jobs, insert the key into the ignition and attempt to start the vehicle—do not rely solely on door lock tests. For residential locks, use a tension wrench to simulate lock cylinder resistance while testing the key’s cuts. If the key binds or fails, recut using a finer file or adjust the cutter depth by 0.001” increments. Always document the code and bittings used for future reference, and store digital records securely if working with VIN-based systems.
The rest of this lesson (full video walkthrough + downloadable PDF + practice exercises) is available to enrolled Lock School students. Enroll →