Locksmith Glossary - U


Source: Lock Industry Standards and Training (LIST) Council

UL
(abb.) Underwriters Laboratories

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.

UL Listed
(adj.) Listed in a directory as having passed specific Underwriters Laboratories testing.

Unassociated Change Key
(n.) A change key which is not related directly to a particular master key through the use of certain constant cuts.

Unassociated Master Key
(n.) A master key which does not have change keys related to its combination through the use of constant cuts.

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.

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.

Unibolt
(n.) A single plate of steel used in place of individual multiple bolts to lock a safe door.

Unidirectional Cylinder
(n.) A cylinder whose key can turn in only one direction from the key pull position.

USB Key
(n.) A hardware key connected to a USB port.

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