Picking the wrong key blank wastes money, creates duplicate attempts, and leaves you frustrated at the locksmith's counter. Getting it right means understanding your lock type, blank specifications, and what to communicate to your key-cutting professional. Here's how to nail the selection every time.
Why Key Blank Selection Matters
A key blank is the uncut metal piece that a locksmith shapes to match your original key's unique cuts and grooves. Not all blanks fit all locks—a blank designed for a Kwikset residential lock won't work in a Schlage, and a blank for a vintage lock won't fit modern hardware. Using the wrong blank wastes $2–5 per attempt and adds time to your project.
The right blank ensures your duplicated key works on the first try, costs less in the long run, and reduces the back-and-forth visits some customers face.
Identify Your Lock Type
Before walking into a key-cutting shop, know what kind of lock you're duplicating for. Here are the main categories:
- Residential pin tumbler locks (Kwikset, Weiser, Schlage)—most common for home doors
- Automotive locks (car door, ignition, trunk keys)—require blanks specific to your vehicle make and year
- High-security or restricted blanks (Medeco, Mul-T-Lock, ASSA ABLOY)—require authentication or proof of ownership
- Antique or specialty locks (vintage safes, decorative hardware, older homes)—may need sourcing or custom blanks
- Master key system blanks—designed to work with multiple cuts for managed access
If you're unsure, bring your original key with you or take a photo. A qualified locksmith can identify the blank type in seconds.
Understand Key Blank Specifications
Key blanks come with identifying codes stamped on the bow (the plastic or metal head) or printed on packaging. These codes tell you exactly which locks the blank will fit. For example:
- Kwikset KW1 blanks fit most standard Kwikset residential locks and cost around $0.75–$1.50 per blank
- Schlage C KeyWay blanks are slightly different and run $0.80–$1.75
- Master Lock blanks vary by series; Series 3 blanks differ from Series 4
Keeping your original key or its code handy (often found on the lock housing or on your original key receipt) eliminates guesswork. Some manufacturers print the keyway code directly on your original key's bow.
Price and Timeline Expectations
Standard residential key blanks typically cost $1–$3 per duplicate at brick-and-mortar shops, with cutting fees adding another $1–$5 per key. Rush services (same-hour cutting) may cost 50% more. High-security or restricted blanks run $5–$15+ per blank, require proof of ownership, and take 1–3 days for order and approval.
Automotive blanks range from $3–$10 depending on make and model; luxury brands can exceed $15. Antique or hard-to-source blanks may take a week or longer and cost significantly more if they require special ordering.
What to Communicate to Your Locksmith
When you contact a key-cutting professional, have this information ready:
- The original key or its code (Kwikset KW1, Schlage C, etc.)
- Quantity needed (most locksmiths offer slight discounts for multiple copies)
- Timeline (same-day, next day, or flexible)
- Any restrictions (if it's a high-security system, some blanks require signed authorization)
- Intended use (home, auto, office)—helps the locksmith confirm the right blank
Platforms like Mercoly let you compare key-cutting providers in your area, read reviews on blank accuracy, and verify turnaround times before committing.
Avoid Common Mistakes
Don't assume all blanks of the same brand are interchangeable—Kwikset KW1 and KW5 blanks look similar but don't work in the same locks. Never choose a blank based solely on appearance; the internal cuts are what matters. If a blank doesn't turn smoothly in your lock after cutting, stop forcing it and return to the locksmith; a wrong blank can damage your lock cylinder.
Frequently Asked Questions
Q: Can I buy key blanks online and have a locksmith cut them? A: Most locksmiths will cut blanks you provide, though some charge a small surcharge ($0.50–$1.50 extra per key) or require you to purchase from them. Always confirm beforehand.
Q: What if my original key is worn or broken? A: Bring the original lock itself or its brand and model number; a locksmith can identify the correct blank by examining the lock's keyway without needing an original key.
Q: Are high-security blanks worth the extra cost? A: If your lock is branded as high-security (Medeco, Mul-T-Lock), yes—standard blanks won't work, and attempting to duplicate with the wrong blank wastes money and risks lock damage.
Ready to find the right locksmith for your blank selection? Compare trusted key-cutting providers in your area on Mercoly.