Lock Grade Chart

Standard grades 1, 2 and 3 have been developed by the ANSI (American National Standards Institute) and the BHMA (Building Hardware Manufacturers Associations). The grades relate to their construction, durability and strength.  Grade 1 being the highest in quality, grade 3 the least. Review the chart below to determine the grade that suits your requirements.
Lock Grades


Grade 1 locks must meet twice the requirements of Grade 2. Grade 1 must function for 800,000 cycles. The lock will last approximately 10 years before replacement is needed.

A suitable choice for demanding applications in high-traffic areas, such as schools, hospitals, office buildings, and other public buildings where strength and the prevention of break-ins is required.


Exceeds residential building requirements, but is mainly used for light commercial needs. The traffic level on the door should not exceed 300 to 400 opening and closing times a day. The lock will last approximately 5 - 7 years before replacement is needed.

Meets light commercial requirements for storage closets, bathrooms, interoffice doors where security with force is less of an issue.


Requires a key-in-knob to withstand at least 120 lbs.-in and a lever lock must withstand at least 180 lbs.-in.

Meets residential building requirements by providing standard residential security. This grade of lock should not be used for any commercial application and their appropriateness for certain residential use on exterior doors is disputed by many locksmiths.
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