A customer hands over a worn key with the stamping half rubbed off. Your shelf holds three brands of blanks, and not one number lines up with what you're reading. Working out how Ilco key blanks compare with the numbers other makers use is the fastest way out of that jam. It also gets much easier once you see how each brand names things.
What Is an Automotive Key Blank Cross Reference?
Think about shoe sizes. A 9 in one brand can fit like an 8.5 in another, so a conversion chart helps you shop. A key blank cross reference does the same job for keys. Every maker gives the same blank its own number, and the chart lines those numbers up side by side. Know one, and you can find the others.
Why Key Blank Numbers Matter
A small mix-up here costs real time. These are the usual headaches the right number saves you from:
- A blank that slides into the lock but won't turn or jams and damages it
- Ordering from a blurry photo and hoping for the best
- Buying the same blank twice because it wore a different brand's label
- A transponder key with the wrong chip type, which cuts fine and still won't start the car
- Returns and wasted afternoons from near-identical blanks
Understanding Ilco, JMA, and Strattec Key Blank Numbers
Three names come up at the counter again and again. Each has its own numbering habits, and none of them is wrong. They simply grew up separately, which is why one key can end up wearing three different codes.
Ilco and Ilco EZ Numbers
Ilco numbers usually mix letters and digits. Extra letters at the end often hint at details such as the head style or whether a chip is built in, and the EZ numbers follow a similar habit. So read the whole code and not just the first few characters. Anyone who stocks Ilco key blanks regularly will tell you a current printed chart beside the machine pays for itself.
JMA and Strattec Numbers
Here's a quick side-by-side of how the three tend to look:
Brand | What the numbers often look like | Good to know |
Ilco | Letters and digits mixed together | Ending letters may point to head style or chip |
JMA | Letters that often hint at the vehicle brand, then a code | Easy to spot the car family at a glance |
Strattec | Mostly plain strings of digits | Many are tied to American makes |
Because of that letter pattern, JMA key blanks are often the easiest to place by sight. Strattec codes are less chatty, so they lean more on the chart to tell you what they fit.
How to Find the Right Key Blank Cross Reference
Any automotive key blank cross reference chart is only as good as its last update, so grab a current one. Then work through it like this:
- Look over the old key for stamped letters or digits on the head or blade.
- Write down the vehicle's make, model and year.
- Find that number in the chart for the brand you already have.
- Follow the row across to see the matching numbers from the other brands.
- Hold the blank against the old key and compare the shape before any cutting starts.
How to Verify a Key Blank by Keyway and Vehicle
Numbers get you close. The keyway gets you certain. That's the groove pattern running along the blade, and it has to fit the channel inside the lock. Put the blank next to the original, look down its length, and compare the grooves, the width and the overall length. Then check the vehicle details again, since the same model can switch locks between years. If it's a transponder key, confirm the chip type too. A blank can cut perfectly and still leave the car stubbornly silent.
Common Key Blank Identification Mistakes to Avoid
Most slip-ups come from hurrying. Watch for these:
- Trusting a number that's half worn away without checking it against the vehicle
- Assuming a matching number means a matching chip
- Using an old chart after a maker has changed its listings
- Skipping the model year
- Treating look-alike Strattec key blanks as the same as another brand's without comparing the keyway
- Cutting first and checking later
Getting It Right Every Time
Matching numbers across brands feels like a puzzle at first, then it turns into habit. Read the key, check the keyway, confirm the vehicle, and cut last. If you'd like a head start, Transponder Island lists Ilco, JMA and Strattec keys by maker, which makes cross-checking a lot less of a chore.
FAQs
What is a key blank cross reference?
It's a chart showing which numbers from different makers point to the same blank. It saves you from guessing.
How do I cross-reference an Ilco key blank?
Find the Ilco number in a current chart and read across to the JMA or Strattec match. Compare keyways before you cut.
What is the difference between Ilco, JMA, and Strattec numbers?
Mostly just naming. Each maker has its own system, so the blank can be identical even when the codes look nothing alike.
How do I find the correct key blank for a vehicle?
Start with make, model and year. Then confirm using the old key's keyway and chip type.
Can one key blank have multiple cross-reference numbers?
Yes, and it's common. Each brand labels it in its own way, so two or three numbers can lead to one blank.