General Combination Lock Requirements

In addition to lock group specifics all combination locks must meet the following minimum criteria to be considered for a UL rating:

  • Enable at least 1 000 000 combinations.
  • Withstand 10 000 cycles of combination dialing at no more than 48 RPM.
  • Withstand vibration at closest resonant frequency for 2 hours.
  • Built using non corrosive materials.

Combination Lock Ratings (Ordered from lowest to highest level of protection)

Group 2:

  • Some resistance to opening attempts.
  • Not suitable for any UL Rated safes.

Group 2M:

  • 2 hours resistance to expert attacks.
  • Used on TL-15, TL-15×6, and TL-30 safes.

Group 1:

  • 20 hours resistance to expert attacks.
  • Special construction techniques not found in other locks.
  • Can be found on any UL rated safe but must be used (or Group 1R used) on TRTL rated safes and TXTL rated safes.

Group 1R:

  • 20 hours resistance to expert attacks.
  • Resistance to radiological techniques (ie. X-rays). Synthetic polymers must withstand aging and humidity.
  • Special construction techniques not found in other locks.
  • Can be found on any UL rated safe but must be used (or Group 1 used) on TRTL rated safes and TXTL rated safes.