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Glossary of Terms

UL

(abb.) Underwriters Laboratories
Source: Lock Industry Standards and Training (LIST) Council

UL Fire Resistive Container Classifications

class 125
(n.) A group of UL classifications for containers that maintain inside temperatures less than 125 degrees Fahrenheit when exposed to a fire of specific temperature and duration. The times and fire temperatures are:

• ½ hour 1700 degrees F.
• 1 hour 1700 degrees F.
• 2 hour 1850 degrees F.
• 3 hour 1925 degrees F.
• 4 hour 2000 degrees F.

class 150
(n.) A group of UL classifications for containers that maintain inside temperatures less than 150 degrees Fahrenheit when exposed to a fire of specific temperature and duration. The times and fire temperatures are:

• ½ hour 1700 degrees F.
• 1 hour 1700 degrees F.
• 2 hour 1850 degrees F.
• 3 hour 1925 degrees F.
• 4 hour 2000 degrees F.

class 350
(n.) A group of UL classifications for containers that maintain inside temperatures less than 350 degrees Fahrenheit when exposed to a fire of specific temperature and duration. The times and fire temperatures are:

• ½ hour 1700 degrees F.
• 1 hour 1700 degrees F.
• 2 hour 1850 degrees F.
• 3 hour 1925 degrees F.
• 4 hour 2000 degrees F.

Source: Lock Industry Standards and Training (LIST) Council

UL Listed

(adj.) Listed in a directory as having passed specific Underwriters Laboratories testing.
Source: Lock Industry Standards and Training (LIST) Council

Unassociated Change Key

(n.) A change key which is not related directly to a particular master key through the use of certain constant cuts.
Source: Lock Industry Standards and Training (LIST) Council

Unassociated Master Key

(n.) A master key which does not have change keys related to its combination through the use of constant cuts.
Source: Lock Industry Standards and Training (LIST) Council

Uncombinated

(adj.) 1. Of or pertaining to a cylinder which is or is to be supplied without keys, tumblers and springs.
(adj.) 2. Of or pertaining to a lock, cylinder or key in which the combination has not been set.
Source: Lock Industry Standards and Training (LIST) Council

Uncontrolled Cross Keying

(n.) A condition in which two or more different keys under different higher level keys operate one cylinder by design; e.g., XAA1 operated by AB, AB1. Note: This condition severely limits the security of the cylinder and the maximum expansion of the system, and often leads to key interchange.
Source: Lock Industry Standards and Training (LIST) Council

Unibolt

(n.) A single plate of steel used in place of individual multiple bolts to lock a safe door.
Source: Lock Industry Standards and Training (LIST) Council

Unidirectional Cylinder

(n.) A cylinder whose key can turn in only one direction from the key pull position.
Source: Lock Industry Standards and Training (LIST) Council

USB Key

(n.) A hardware key connected to a USB port.
Source: Lock Industry Standards and Training (LIST) Council