Lock Grades

Lock Grades

All locks carry a grading certification that basically describes the durability of the lock. In addition to the grading qualifications, some high security locks also carry a U.L. certification for additional testing. Remember that a lock may have “Meets grade 2 standards” or “Exceeds grade 2 standards,” but that does not necessarily mean that it was actually tested. If a lock carries the statement “Tested to Grade 2 certifications” or “Grade 1 certified” then it’s actually been tested to meet the certifications.

Listed below are only some of the tests and criteria covered in this standard. For simplification, all tests and details of tests are not elaborated on. For exact and complete details of tests, etc. refer to the complete ANSI/BHMA standard.

1. Cycle test
One cycle consists of the knob or lever handle to be turned to completely retract the latch bolt allowing the test door to be opened. The knob or lever handle is then released allowing the test door to relatch. The turning direction of the knob is alternated every 100,000 cycles.

Performance tests are conducted for compliance at various intervals during and at the end of the cycle test.

  • Grade 1 – 1,000,000 cycles
  • Grade 2 – 800,000 cycles
  • Grade 3 – 800,000 cycles

    2. Latchbolt projection

  • Grade 1 – 3/4 inch
  • Grade 2 – 1/2 inch
  • Grade 3 – 1/2 inch

    3. Deadbolt projection

  • Grade 1 – 1 inch
  • Grade 2 – 5/8 inch
  • Grade 3 – 5/8 inch

    4. Knob or Lever torque to retract latchbolt or latchbolt and deadbolt.

  • By Knob – all grades – 9 inch pounds
  • By lever – all grades – 28 inch pounds

    5. Torque to retract deadbolt or deadbolt and latchbolt by turn.

  • All grades – 9 inch pounds

    6. Torque to retract deadbolt or deadbolt and latchbolt by key.

  • All grades – 9 inch pounds

    7. Force to latch door closed.

  • All grades – 4.5 pounds

    8. Knob or lever impact test.

  • Grade 1 – 75 foot pounds – 10 blows
  • Grade 2 – 75 foot pounds – 5 blows
  • Grade 3 – 75 foot pounds – 2 blows

    9. Deadbolt or latchbolt or deadbolt and latchbolt impact test.
    Grade 1

  • 60 foot pounds – 2 blows
  • 90 foot pounds – 2 blows
  • 120 foot pounds – 2 blows
  • 150 foot pounds – 2 blows

    Grade 2

  • 60 foot pounds – 2 blows
  • 90 foot pounds – 2 blows
  • 120 foot pounds – 2 blows

    Grade 3

  • 60 foot pounds – 2 blows
  • 90 foot pounds – 2 blows

    10. Bolt end pressure test.

  • Latchbolt (guarded) – all grades – 360 pounds
  • Deadbolt – all grades – 600 pounds

    11. Deadbolt sawing resistance.

  • All grades – 5 minutes

Above courtesy of Bay Area Locks. If you are ever in the Redwood City, CA and need a locksmith, be sure to contact them, they are a great company to work with.