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Guessing my combination? Want a hint? Wear on Unrated Electronic Keypad Lock A UL 768 rating will ensure that your combination lock offers protection from basic attacks. Get a gun safe with combination locks of UL 768 Group II or better. Most gun safe owners would prefer to have metal for reliability, although plastics have come a long way.

Their gate materials are made out of plastics to prevent x-ray imaging. Group 1R locks aren’t common on gun safes. Most electronic locks that meet UL 768 will meet Group 1. Since UL 768 was developed for mechanical dial combination locks, not all of the UL 768 specifications apply to electronic locks. Secure against radiological attacks for 20 hours with a radioactive source not exceeding the equivalent of 10 curies of cobalt-60 at a 30″ (762 mm) distance.Compliant with all Group 1 requirements.The weight of instruments or detection devices used in tests will not exceed 50 pounds (22.7 kg).Any other techniques developed during testing.Manipulation protection shall include advanced features not found in conventional designs.Lock experts may be called upon to participate in these tests. The time specified above may be one man working for 20 hours, two men working for 10 hours, and so on.Resists against manipulation and unauthorized opening for 20 hours.Immobilization is not required in locks where punching does not defeat the locking action.Punching of a Group 1 lock shall result in the lock bolt becoming immobilized by mechanical means.Tolerances for a four-number wheel lock are 1.25 dial graduations on either side of the correct number.Tolerances for a three-number wheel lock are 1.00 dial graduations on either side of the correct number.Combination wheels are set at various combinations to ensure the lock will operate normally but will not open with the dial turned beyond the acceptable tolerances.Tolerances for a four-number wheel lock are 1.50 dial graduations on either side of the correct number.Tolerances for a three-number wheel lock are 1.25 dial graduations on either side of the correct number.Tumblers shall be placed at right angles to the tumbler post.

Clearance between the fence face and the tumbler wheels shall not be less that 0.025″ when the bolt lever is raised by means of a driver cam, and not less than 0.015″ when the bolt lever is raised by means other than the driver cam.

The fence shall be perpendicular to the plane of the tumblers.

The lever shall fit snugly on the post and shall be secured tightly.

This dictates dial numbering from 0 to 99 for a 3 wheel combination lock regardless of the lock’s accuracy.

At least 1,000,000 different (theoretical) combinations.

These are the UL 768 Standard requirements: