LOCKSMITH DICTIONARY
- U -
- 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 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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