Home security & break-ins
Lock grades explained: what Grade 1, 2 and 3 really mean
Pick up a deadbolt at a big-box store and the packaging will usually mention a grade. It is a useful number, as long as you know what it is actually measuring.
By Timmy Creighton, founder and licensed locksmith · Major Key Locksmith · October 2026
Who sets the grades
In the US, door hardware is tested against standards published by ANSI and BHMA, the American National Standards Institute and the Builders Hardware Manufacturers Association. A lock is put through cycle tests (how many times it can be locked and unlocked before it fails), strength tests (how much force the bolt and housing take) and finish tests. It then earns a grade.
- Grade 1 is the heaviest duty. Built for commercial doors that open hundreds of times a day.
- Grade 2 is solid residential and light commercial. A good front-door lock usually lives here.
- Grade 3 is the basic residential tier. Fine for an interior door, light for a front door.
What the grade does not tell you
A grade is about strength and durability. It says very little about picking, bumping or key control. A Grade 1 deadbolt with a standard keyway can still be picked by someone skilled, and its key can still be copied at any hardware store. Those are different problems with a different answer, covered in what makes a lock high-security.
It also tells you nothing about the door. A Grade 1 bolt sitting in a soft pine frame held with short screws fails at the frame, not the lock. That is why we check the strike and the screws before we talk about upgrading a lock.
What we recommend
- Front, back and garage-entry doors: a Grade 1 or Grade 2 deadbolt, installed into a properly reinforced strike.
- A door you worry about: a high-security deadbolt with a patented key.
- Interior doors: Grade 3 is fine. Nobody needs a commercial lock on a bathroom.
- Businesses: commercial-grade hardware throughout. A residential knob will not survive a busy entrance.
Questions people ask
Is a Grade 1 lock pick-proof?
No. Grading measures strength and durability. Pick resistance and key control come from the cylinder design, which is what separates a high-security lock from a standard one.
Where do I find a lock’s grade?
On the packaging or the manufacturer’s specification sheet. If it is not stated anywhere, assume the lock has not been graded.
Do smart locks have grades?
Many do, and the grade is usually listed on the specification sheet. Check it the same way you would for a regular deadbolt.
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Keep reading
Any price mentioned here is the one published on our pricing page as of October 2026. The final price is always confirmed with you before any work begins. More answers from the blog →