|
|
| ALOA |
| The Associated Locksmiths of
America. |
|
|
| Backplate |
| A plate on the inside of a door
through which the cylinder connecting screws and
tailpiece is passed. |
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| Backset |
| The horizontal distance from the
edge of a door to the center of a lockset. |
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| Barrel Key |
| A key with a bit projecting from a
hollow cylindrical shaft. |
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| Bi-Lock |
| A pin tumbler cylinder lock
consisting of two parallel rows of pin tumblers and two
sidebars operated by a U shaped key. |
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| Bible |
| portion of the cylinder
shell which normally houses the pin chambers, especially
those of a key-in-knob cylinder or certain rim cylinders |
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| Bit |
1. n. the part
of the key which serves as the blade, usually for use in
a warded or lever tumbler lock
2. v. to cut a key |
| Top |
| Bit Key |
| A key with a bit projecting from a
solid cylindrical shank. The bit has cuts to bypass the
wards or operate levers in the correct lock. |
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| Bit Key Lock |
| A warded or lever lock that uses bit
keys. |
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| Bitting |
| A cut, or series of cuts, on the bit
or blade of a key. |
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| Bitting Depth |
| n. the depth of a cut which is made
into the blade of a key |
| Top |
| Bitting List |
| n. a listing of all the key
combinations used within a system. The combinations are
usually arranged in order of the blind code, direct
code, and/or key symbol. |
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| Blade |
| The part of the key that is inserted
into the lock. |
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| Blank |
| A key before any cuts have been
made, or a key that is not fully cut and thus is not yet
operational. |
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| Blind Code |
| n. a designation, unrelated to the
biting, assigned to a particular key combination for
future reference when additional keys or cylinders may
be needed |
| Top |
| Bow |
| n. the portion of the key which
serves as a grip or handle |
| Top |
| Bow Stop |
| n. a type of stop located near the
key bow |
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| Broach |
1. n. a tool
used to cut the keyway into the cylinder plug
2. v. to cut the keyway into a
cylinder plug with a broach |
| Top |
| Build-up Pin |
| n. the additional element of a pin
stack required to allow operation at independent shear
lines in a cylinder |
| Top |
| Building Master Key |
| n. a master key which operates all
or most master keyed locks in a given building |
| Top |
|
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| cam |
| n. a flat actuator or locking bolt
attached to the rear of a cylinder perpendicular to its
plug and rotated by the key |
| Top |
| cam lock |
| A lock that has an attached cam that
serves as the lock`s bolt. Cam locks are often used on
cabinets, file cabinets and drawers. |
| Top |
| capping block |
| n. a holding fixture for certain
interchangeable cores which aids in the installation of
the caps |
| Top |
| case ward |
| Protrusions that stick out of the
sides of the keyway to allow entry of only the correct
type of key blank. |
| Top |
| chamber |
| n. any cavity in a cylinder plug
and/or shell which houses the tumbler(s) |
| Top |
| change key |
| The key that operates one lock in a
master keyed suite. |
| Top |
| CK |
| 1. abb. change key 2. abb. control
key |
| Top |
- n. the
deliberate process of combinating a cylinder
(usually in a master key system) to two or more
different keys which would not normally be expected
to operate it together. See also "controlled cross
keying," "uncontrolled cross keying. "cut
- Top
|
| Top |
| CMK`d |
| abb. construction master keyed |
| Top |
| code |
| A series of numbers or digits on a
key or lock that specifies or references the particular
cuts of the key to operate a lock. |
| Top |
| combination |
| n. the group of numbers which
represent the biting of a key and/or the tumblers of a
lock or cylinder |
| Top |
| concealed shell cylinder |
| n. a specially constructed (usually
mortise) cylinder. Only the plug face is visible when
the lock trim is in place. |
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| constant cut |
| 1. n. Any biting(s) which are
identical in corresponding positions from one key to
another in a keying system. They usually serve to group
these keys together within a given level of keying,
and/or link them with keys of other levels. |
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| construction core |
| n. an interchangeable or removable
core designed for use during the construction phase of a
building. The cores are normally keyed alike and, upon
completion of construction, they are to be replaced by
the permanent system`s cores. |
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| construction master key |
| n. a key normally used by
construction personnel for a temporary period during
building construction. It may be rendered permanently
inoperative without disassembling the cylinder. |
| Top |
| construction master keyed |
| adj. of or pertaining to a cylinder
which is or is to be operated temporarily by a
construction master key |
| Top |
| control cut |
| 1. n. any biting which operates the
retaining device of an interchangeable or removable core
|
| Top |
| control key |
| A key used to remove the core from a
removable core or interchangeable core cylinder. |
| Top |
| control lug |
| n. that part of an interchangeable
or removable core retaining device which locks the core
into its housing |
| Top |
| control sleeve |
| n. the part of an interchangeable or
removable core retaining device which surrounds the plug
|
| Top |
| controlled
cross keying |
| n. a condition in which two or more
different keys of the same level of keying and under the
same higher level key(s) operate one cylinder by design;
e.g., XAA1 operated by AA2 ( but not XAA1 operated by
AB1) NOTE: This condition could severely limit the
security of the cylinder and the maximum expansion of
the system when (1) more than a few of these different
keys operate a cylinder, or (2) more than a few
differently cross keyed cylinders per system are
required. |
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| core |
| n. a complete unit, often with a
figure 8 shape, which usually consists of the plug,
shell, tumblers, springs, plug retainer and spring
cover(s). It is primarily used in removable and
interchangeable core cylinders and locks. |
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| cross
keying |
| n. the deliberate process of
combinating a cylinder (usually in a master key system)
to two or more different keys which would not normally
be expected to operate it together. See also `controlled
cross keying,` `uncontrolled cross keying.` |
| Top |
| cuts |
| A cut, or series of cuts, on the bit
or blade of a key. |
| Top |
| cylinder |
| n. a complete operating unit which
usually consists of the plug, shell, tumblers, springs,
plug retainer, a cam/tailpiece or other actuating
device, and all other necessary operating parts |
| Top |
| cylinder key |
| A key for use with pin tumbler and
wafer tumbler cylinder locks. |
| Top |
|
|
| deadbolt |
| A lock bolt, usually rectangular,
that has no spring action, and that becomes locked
against end pressure when fully projected. |
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| dead latch |
| A lock with a beveled latch bolt
that can be automatically or manually locked against end
pressure when projected. |
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| deadlock |
| A lock that projects a deadbolt. |
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| depth |
| The depth of a cut is measured from
the bottom of the blade up to the bottom of a cut.
Depths are numbered starting with #0 (or sometimes #1)
as the highest depth. |
| Top |
| depth key |
| A special key that enables a
locksmith to cut blanks made from a particular lock
according to a key code. |
| Top |
| display key |
| n. a special change key in a hotel
master key system which will allow access to one
designated guest room, even if the lock is in the shut
out mode. It may also act as a shut out key for that
room. |
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| drivers |
| The pins in a lock that sit on top
of the lower pins. |
| Top |
|
|
| ejector hole |
| n. a hole found on the bottom of
certain interchangeable cores under each pin chamber. It
provides a path for the ejector pin. |
| Top |
| ejector pin |
| n. a tool used to drive all the
elements of a pin chamber out of certain interchangeable
cores |
| Top |
| emergency key |
| n. the key which operates a privacy
function lockset |
| Top |
| emergency master key |
| n. a special master key which
usually operates all guest room locks in a hotel master
key system at all times, even in the shut out mode. This
key may also act as a shut out key. |
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| EMK |
| abb. emergency master key |
| Top |
| ENG |
| symbol for engineer`s key |
| Top |
| engineer`s key |
| n. a selective master key which is
used by maintenance personnel to operate many locks
under different master keys in a system of three or more
levels of keying |
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|
|
| GGGMK |
| abb. great great grand master key
|
| Top |
| GGGMK`d |
| abb. great great grand master keyed
|
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| GGM |
| abb. great grand master key |
| Top |
| GGMK |
| abb. great grand master key |
| Top |
| GGMK`d |
| abb. great grand master keyed |
| Top |
| GM |
| abb. grand master key |
| Top |
| GMK |
| abb. grand master key |
| Top |
| GMK`d |
| abb. grand master keyed |
| Top |
| grand master key |
| The highest level master key that
fits all the locks in a multi-level master keyed system. |
| Top |
| grand master key system |
| n. a master key system which has
exactly three levels of keying |
| Top |
| grand master keyed |
| adj. of or pertaining to a lock or
cylinder which is or is to be keyed into a grand master
key system |
| Top |
| great grand master key |
| n. the key which operates two or
more separate groups of locks which are each operated by
a different grand master key |
| Top |
| great grand master key system |
| n. a master key system which has
exactly four levels of keying |
| Top |
| great grand master keyed |
| adj. of or pertaining to a lock or
cylinder which is or is to be keyed into a great grand
master key system |
| Top |
| great great grand master key |
| n. the key which operates two or
more separate groups of locks which are each operated by
different great grand master keys |
| Top |
| great great grand master key
system |
| n. a master key system which has
five or more levels of keying |
| Top |
| great great grand master keyed |
| adj. of or pertaining to a lock or
cylinder which is or is to be keyed into a great great
grand master key system |
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| grooves |
| [image] Long narrow milled out areas
along the sides of the blade to allow the blade to
bypass the wards in the keyway. |
| Top |
| guest key |
| n. a key in a hotel master key
system which is normally used to unlock only the one
guest room for which it was intended, but will not
operate the lock in the shut out mode |
| Top |
|
|
| hardware schedule |
| n. a listing of the door hardware
used on a particular job. It includes the types of
hardware, manufacturers, locations, finishes, and sizes.
It should include a keying schedule specifying how each
locking device is to be keyed. |
| Top |
| high
security cylinder |
| n. a cylinder which offers a greater
degree of resistance to any or all of the following:
picking, impressioning, key duplication, drilling or
other forms of forcible entry |
| Top |
| HKP |
| abb. housekeeper`s key |
| Top |
| hollow post key |
| [image] A key with a bit projecting
from a hollow cylindrical shaft. |
| Top |
| housekeeper`s key |
| n. a selective master key in a hotel
master key system which may operate all guest and linen
rooms and other housekeeping areas |
| Top |
| housing |
| n. that part of a locking device
which is designed to hold a core |
| Top |
|
|
| IAHSSP |
| International Association of Home
Safety and Security Professionals. |
| Top |
| IC |
| abb. interchangeable core |
| Top |
| impressioning |
| A means of fitting a key directly to
a locked cylinder by manipulating a blank in the keyway
and cutting the blank where the tumblers have made
marks. |
| Top |
| incidental master key |
| n. a key cut to an unplanned shear
line created when the cylinder is combinated to the top
master key and a change key |
| Top |
| increment |
| n. a usually uniform increase or
decrease in the successive depths of a key cut which
must be matched by a corresponding change in the
tumblers |
| Top |
| interchangeable core |
| n. a key removable core which can be
used in all or most of the core manufacturer`s product
line. No tools (other than the control key) are required
for removal of the core. |
| Top |
|
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| jamb |
| The inside vertical face of a
doorway or window frame. |
| Top |
|
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| KA |
| abb. keyed alike |
| Top |
| KD |
| abb. keyed different |
| Top |
| key |
| n. a properly combinated device
which is, or most closely resembles, the device
specifically intended by the lock manufacturer to
operate the corresponding lock |
| Top |
| key bitting array |
| n. a matrix (graphic) display of all
possible bittings for change keys and master keys as
related to the top master key |
| Top |
| key bitting punch |
| n. a manually operated device which
stamps or punches the cuts into the key blade, rather
than grinding or milling them |
| Top |
| key blank |
| n. any material manufactured to the
proper size and configuration which allows its entry
into the keyway of a specific locking device. A key
blank has not yet been combinated or cut. |
| Top |
| key code |
| A series of numbers or digits on a
key or lock that specifies or references the particular
cuts of the key to operate a lock. |
| Top |
| key coding machine |
| n. a key machine designed for the
production of code keys. It may or may not also serve as
a duplicating machine. |
| Top |
| key duplicating machine |
| n. a key machine which is designed
to make copies from a pattern key |
| Top |
| key gauge |
| n. a usually flat device with a
cutaway portion indexed with a given set of depth or
spacing specifications. It is used to help determine the
combination of a key. |
| Top |
| key interchange |
| n. an undesirable condition, usually
in a master key system, whereby a key unintentionally
operates a cylinder or lock |
| Top |
| key machine |
| n. any machine designed to cut keys.
See also `key coding machine` and `key duplicating
machine.` |
| Top |
| key manipulation |
| n. manipulation of an incorrect key
in order to operate a lock or cylinder |
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| key records |
| n. pl. records which typically
include some or all of the following: biting list, key
biting array, key system schematic, end user, number of
keys/cylinders issued, names of persons to whom keys
were issued, hardware/keying schedule |
| Top |
| key section |
| n. the exact cross sectional
configuration of a key blade as viewed from the bow
toward the tip |
| Top |
| key symbol |
| n. a designation used for a key
combination in the standard key coding system, e.g., A,
AA, AA1, etc. |
| Top |
| key system schematic |
| n. a drawing with blocks utilizing
keying symbols, usually illustrating the hierarchy of
all keys within a master key system. It indicates the
structure and total expansion of the system. |
| Top |
| keyed alike |
| adj. of or pertaining to two or more
locks or cylinders which have or are to have the same
combination. They may or may not be part of a keying
system. |
| Top |
| keyed different |
| adj. of or pertaining to a group of
locks or cylinders, each of which is or is to be
combinated differently from the others. They may or may
not be part of a keying system. |
| Top |
| keyed random |
| adj. of or pertaining to a cylinder
or group of cylinders selected from a limited inventory
of different key changes. Duplicate bitings may occur.
|
| Top |
| keyed. |
| 1. adj. combinated 2. having
provision for operation by key |
| Top |
| keying |
| n. any specification for how a
cylinder or group of cylinders are or are to be
combinated in order to control access |
| Top |
| keying conference |
| n. a meeting of the end user and the
key system supplier at which the keying and levels of
keying, including future expansion, are determined and
specified |
| Top |
| keying schedule |
| n. a detailed specification of the
keying system listing how all cylinders are to be keyed
and the quantities, markings, and shipping instructions
of all keys and/or cylinders to be provided |
| Top |
| keying symbol |
| n. a designation used for a lock or
cylinder combination in the standard key coding system;
e.g., AA1, XAA1, X1X, etc. |
| Top |
| keyway |
| 1. n. the opening in a lock or
cylinder which is shaped to accept a key bit or blade of
a proper configuration 2. the exact cross sectional
configuration of a keyway as viewed from the front. It
is not necessarily the same as the key section. |
| Top |
| keyway grooves |
| [image] Long narrow milled out areas
along the sides of the blade to allow the blade to
bypass the wards in the keyway. |
| Top |
| KR |
| 1. abb. keyed random 2. abb. key
retaining |
| Top |
| KWY |
| abb. keyway |
| Top |
|
|
| lever lock |
| lock with levers that are each
lifted to the correct level by a bit key or flat metal
key to enable the lock to operate. |
| Top |
| lower pins |
| The pins of a lock that contact the
cuts on the key. Also called bottom pins. |
| Top |
|
|
| MACS |
| abb. maximum adjacent cut
specification. MACS exists because of the physical
relationship between the spacing of key cuts, the
increment between cut depths, and the angle of the
cutter. As each of these three factors changes, so does
the MACS. That is why the MACS can be different from one
manufacturer to another, or even for different cylinder
products within the same manufacturer, like Schlage full
size keys and small format IC keys. |
| Top |
| maid`s master key |
| n. the master key in a hotel master
key system given to the maid. It operates only cylinders
of the guest rooms and linen closets in the maid`s
designated area. |
| Top |
| maison key system |
| n. [from the French, meaning `house`
key system] a keying system in which one or more
cylinders are operated by every key (or relatively large
numbers of different keys) in the system; e.g., main
entrances of apartment buildings operated by all
individual suite keys of the building |
| Top |
| master key |
| 1. n. a key which operates all the
master keyed locks or cylinders in a group, each lock or
cylinder usually operated by its own change key 2. v. to
combinate a group of locks or cylinders such that each
is operated by its own change key as well as by a master
key for the entire group |
| Top |
| master key system |
| 1. n. any keying arrangement which
has two or more levels of keying 2. a keying arrangement
which has exactly two levels of keying |
| Top |
| master keyed |
| adj. of or pertaining to a cylinder
or group of cylinders which are or are to be combinated
so that all may be operated by their own change key(s)
and by additional key(s) known as master key(s) |
| Top |
| master keyed only |
| adj. of or pertaining to a lock or
cylinder which is or is to be combinated only to a
master key |
| Top |
| master pin |
| 1. n. usually a cylindrical shaped
tumbler, flat on both ends, placed between the top and
bottom pin to create an additional shear line 2. a pin
tumbler with multiple gates to accept a sidebar |
| Top |
| maximum adjacent cut
specification (MACS) |
| n. the maximum allowable difference
between adjacent cut depths |
| Top |
| MK |
| abb. master key |
| Top |
| MK`d |
| abb. master keyed |
| Top |
| MK`d only |
| abb. master keyed only |
| Top |
| MLAA |
| Master Locksmith Association of
Australia |
| Top |
| multi-section key blank |
| n. a key section which enters more
than one, but not all keyways in a multiplex key system
|
| Top |
| multiplex key blank |
| n. any key blank which is part of a
multiplex key system |
| Top |
| multiplex key system |
| 1. n. a series of different key
sections which may be used to expand a master key system
by repeating bitings on additional key sections. The
keys of one key section will not enter the keyway of
another key section. This type of system always includes
another key section which will enter more than one, or
all of the keyways. 2. a keying system which uses such
keyways and key sections |
| Top |
|
|
| NCK |
| symbol for `no change key,`
primarily used in hardware schedules |
| Top |
| NMK |
| a keying symbol which means `not
master keyed` and is suffixed in parentheses to the
regular key symbol. It indicates that the cylinder is
not to be operated by the master key(s) specified in the
regular key symbol; e.g., AB6(NMK). |
| Top |
| non key retaining |
| adj. of or pertaining to a lock
whose key can be removed in both the locked and unlocked
positions |
| Top |
|
|
| O-bitted |
| see `zero bitted` |
| Top |
| one bitted |
| adj. of or pertaining to a cylinder
which is or is to be combinated to keys cut to the
manufacturer`s reference number one bitting. |
| Top |
| operating key |
| n. 1. any key which will properly
operate a lock or cylinder to lock or unlock the lock
mechanism and is not a control key or reset key |
| Top |
|
|
| paracentric |
| 1. adj. of or pertaining to a keyway
with one or more wards on each side projecting beyond
the vertical center line of the keyway to hinder picking
2. of or pertaining to a key blank made to enter such a
keyway |
| Top |
| pin |
| v. to install pin tumblers into a
cylinder and/or cylinder plug |
| Top |
| pin chamber |
| n. the corresponding hole drilled
into the cylinder shell and/or plug to accept the pin(s)
and spring |
| Top |
| pin stack |
| n. all the tumblers in a given pin
chamber |
| Top |
| pin stack height |
| n. the measurement of a pin stack,
often expressed in units of the lock manufacturer`s
increment or as an actual dimension |
| Top |
| pin tumbler |
| n. usually a cylindrical shaped
tumbler. Three types are normally used: bottom pin,
master pin and top pin. |
| Top |
| pinning chart |
| n. a numerical diagram which
indicates the sizes and order of installation of the
various pins into a cylinder. The sizes are usually
indicated by a manufacturer`s reference number which
equals the quantity of increments a tumbler represents.
|
| Top |
| pipe key |
| A key with a bit projecting from a
hollow cylindrical shaft. |
| Top |
| plug |
| n. the part of a cylinder which
contains the keyway, with tumbler chambers usually
corresponding to those in the cylinder shell |
| Top |
| plug follower |
| n. a tool used to allow removal of
the cylinder plug while retaining the top pins, springs,
and/or other components within the shell |
| Top |
| plug holder |
| n. a holding fixture which assists
in the loading of tumblers into a cylinder plug |
| Top |
| progress |
| v. to select possible key bitings
from the key biting array, usually in numerical order
|
| Top |
| progression |
| n. a logical sequence of selecting
possible key bitings, usually in numerical order from
the key biting array |
| Top |
| progressive |
| n. any bitting position which is
progressed rather than held constant |
| Top |
|
|
| restricted |
| adj. of or pertaining to a keyway
and corresponding key blank whose sale and/or
distribution is limited by the lock manufacturer in
order to reduce unauthorized key proliferation |
| Top |
| rotating constant |
| n. one or more cut(s) in a key of
any level which remain constant throughout all levels
and are identical to the top master key cuts in their
corresponding positions. The positions where the top
master key cuts are held constant may be moved, always
in a logical sequence. |
| Top |
| rotating constant method |
| n. a method used to progress key
bittings in a master key system, wherein at least one
cut in each key is identical to the corresponding cut in
the top master key. The identical cut(s) is moved to
different locations in a logical sequence until each
possible planned position has been used. |
| Top |
|
|
| sub-master
key |
| n. the master key level immediately
below the master key in a system of six or more levels
of keying |
| Top |
| stop (of a key) |
| n. the part of a key from which all
cuts are indexed and which determines how far the key
enters the keyway |
| Top |
| selective key system |
| n. a key system in which every key
has the capability of being a master key. It is normally
used for applications requiring a limited number of keys
and extensive cross keying. |
| Top |
| selective master key |
| n. an unassociated master key which
can be made to operate any specific lock(s) in the
entire system in addition to the regular master key(s)
and/or change key(s) for the cylinder without creating
key interchange |
| Top |
| sequence of progression |
| n. the order in which bitting
positions are progressed to obtain change key
combinations |
| Top |
| set-up key |
| 1. n. a key used to calibrate some
types of key machines 2. a key cut to all #9 depths,
used to hold Primus finger pins and Everest check pins
in place while loading the plug |
| Top |
| SFIC |
| abb. small format interchangeable
core |
| Top |
| shear line |
| n. a location in cylinder at which
specific tumbler surfaces must be aligned, removing
obstruction(s) which prevented the plug from moving |
| Top |
| shell |
| n. the part of the cylinder which
surrounds the plug and which usually contains tumbler
chambers corresponding to those in the plug |
| Top |
| shoulder |
| The edge of the key that touches the
face of the lock to define how far the key is inserted
into the lock. |
| Top |
| shoulder |
| n. any key stop other than a tip
stop, see also `bow stop` |
| Top |
| shove knife |
| n. a tool used with a set-up plug
which pushes the springs and pin tumblers into the
cylinder shell |
| Top |
| shut out mode |
| n. the state of a hotel function
lockset which prevents operation by all keys except the
emergency master key, display key, and some types of
shut out keys |
| Top |
| sidebar |
| n. a primary or secondary locking
device in a cylinder. When locked, it extends along the
plug beyond its circumference. It must enter gates in
the tumblers in order to clear the shell and allow the
plug to rotate. |
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| simplex key section |
| n. a single independent key section
which cannot be used in a multiplex key system |
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| single key section |
| n. an individual key section which
can be used in a multiplex key system |
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| single step progression |
| n. a progression using a one
increment difference between bittings of a given
position |
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| SKD |
| symbol for `single keyed,` normally
followed by a numerical designation in the standard key
coding system; e.g., SKD1, SKD2, etc. It indicates that
a cylinder or lock is not master keyed but is part of
the keying system. |
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| SMK |
| abb. sub-master key |
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| spacing |
| n. the dimensions from the stop to
the center of the first cut and/or to the centers of
successive cuts |
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| spool pin |
| A pin that has a groove cut around
it`s periphery. The groove is intended to catch at the
shear line as a deterrent to picking. |
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| spring cover |
| n. a device for sealing one or more
pin chambers |
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| standard key coding system |
| n. an industry standard and uniform
method of designating all keys and/or cylinders in a
master key system. The designation automatically
indicates the exact function and keying level of each
key and/or cylinder in the system, usually without
further explanation. |
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| standard progression format |
| n. a systematic method of listing
and relating all change key combinations to all master
key combinations in a master key system. The listing is
divided into segments known as blocks, horizontal
groups, vertical groups, rows, and pages, for levels of
control. |
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|
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| two step progression |
| n. a progression using a two
increment difference between bittings of a given
position |
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| tumbler |
| n. a movable obstruction of varying
size and configuration in a lock or cylinder which makes
direct contact with the key or another tumbler and
prevents an incorrect key or torquing device from
activating the lock or other mechanism |
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| top pins |
| The pins in a lock that sit on top
of the lower pins. |
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| top master key |
| The highest level master key that
fits all the locks in a multi-level master keyed system. |
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| TMK |
| abb. top master key |
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| tip stop |
| n. a type of stop located at or near
the tip of the key |
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| tip |
| n. the portion of the key which
enters the keyway first |
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| theoretical key changes |
| n. pl. the total possible number of
different combinations available for a specific cylinder
or lock mechanism |
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| tang |
| The end of a file where a handle is
to be attached. |
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| tailpiece |
| n. an actuator attached to the rear
of the cylinder, parallel to the plug, typically used on
rim, key-in-knob or special purpose cylinders |
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|
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| upper pins |
| The pins in a lock that sit on top
of the lower pins. |
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| 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 |
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| uncombinated |
| 1. adj. 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 |
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| unassociated master key |
| n. a master key which does not have
change keys related to its combination through the use
of constant cuts |
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| unassociated change key |
| n. a change key which is not related
directly to a particular master key through the use of
certain constant cuts |
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| UL |
| abb. Underwriters Laboratories |
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|
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| VKC |
| abb. visual key control |
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| visual key control |
| n. a specification that all keys and
the visible portion of the front of all lock cylinders
be stamped with standard keying symbols |
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|
|
| ward |
| Protrusions that stick out of the
sides of the keyway to allow entry of only the correct
type of key blank. |
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|
|
| symbol used in hardware schedules to
indicate a cross keyed condition for a particular
cylinder; e.g., XAA2, X1X (but not AX7) |
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|
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| zero bitted |
| adj. of or pertaining to a cylinder
which is or is to be combinated to keys cut to the
manufacturer's reference number "0" biting |
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