great great grand master key system n. a master
key system which has five or more levels of keying
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
guide n. 1. that part of a key machine which
follows the cuts of a pattern key or template during
duplication 2. that part of a flat key lever lock
which connects the nose to the foot and supports the
key blade
-H-
hand change adj. pertaining to a combination
lock in which the wheels must be removed in order
to change the combination
handed adj. pertaining to hardware which is
manufactured only for application on doors with
a specific orientation
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.
hasp n. a hinged metal strap designed to be passed
over a staple and secured in place
heel & toe locking n. describes a padlock which has
locking dogs at both the heel and toe of the shackle
heel (of a padlock shackle) n. the part of a padlock
shackle which is retained in the case when in the
unlocked position
HGM abb. horizontal group master key
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
high security key n. a key for a high security
cylinder
hinged shackle n. a shackle whose heel is
permanently mounted to the padlock case in a
manner which allows the shackle to pivot to open
Hobbs shackle n. a hinged shackle with a notch
for the bolt in its movable end
holding fixture n. a device which holds cylinder
plugs, cylinders, housings, and/or cores to
facilitate the installation of tumblers, springs
and/or spring covers
hollow driver n. a top pin hollowed out on one end
to receive the spring, typically used in cylinders with
extremely limited clearance in the pin chambers
hook bolt n. a lock bolt shaped in the general
outline of a hook. Normally used on sliding doors
or where spreading of the frame and door is a
possible attack.
horizontal group master key n. the two pin master
key for all combinations listed in all blocks in a line
across the page in the standard progression format
horn n. in a non-cylinder lock, the housing which
surrounds the nose and extends through the door
or drawer
horn plate n. the cover of a lever tumbler lock case
to which the horn is attached
housing n. that part of a locking device which is
designed to hold a core
hub n. a lock component, which redirects rotational
motion from a spindle or shaft to linear movement
of a latch or bolt
-I-
IC abb. interchangeable core
impression n. the mark made by a tumbler on its
key cut v. to fit a key by the impression technique
impression technique n. 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
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
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
index (of a combination lock dial) n. the mark
outside the dial ring of a combination lock used as a
reference point
individual key n. an operating key for a lock or
cylinder which is not part of a keying system, see also
“change key” definition 1
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.
-K-
k sym. symbol for "keys" used after a numerical
designation of the quantity of the keys requested to
be supplied with the cylinders; e.g., lk, 2k, 3k, etc.
it is usually found in hardware/keying schedules.
KA abb. keyed alike
KA1, KA2, etc. symbol which indicates that all
cylinders so designated are or are to be operated by
the same key(s). The numerical designation indicates
the keyed alike group or set.
KA/2, KA/3, etc. symbol used to indicate the
quantity of locks or cylinders in keyed alike groups.
These groups are usually formed from a larger
quantity; e.g., 30 cylinders KA/2.
KBA abb. key bitting array
KD abb. keyed different
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
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
key bitting punch n. a manually operated device
which stamps or punches the cuts into the key blade,
rather than grinding or milling them
key bitting specifications n. pl. the technical data
required to bit a given (family of) key blank(s) to the
lock manufacturer's dimensions
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.
key change adj. referring to a lock in which the
combination can be changed through the use of a
special key or tool without disassembling the lock
key changeable adj. of or pertaining to a lock or
cylinder which can be recombinated without
disassembly, by the use of a key. The use of a tool may
also be required.
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.
key control n. 1. any method or procedure
which limits unauthorized acquisition of a key and/
or controls distribution of authorized keys
2. a systematic organization of keys and key records
key cut(s) n. the portion of the key blade which
remains after being cut and which aligns the
tumbler(s)
key cut profile n. the shape of a key cut,
including the cut angle and the out root shape
key duplicating machine n. a key machine which
is designed to make copies from a pattern key
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.
key-in-knob cylinder n. a cylinder used in a key-in-
knob lockset
key interchange n. an undesirable condition, usually
in a master key system, whereby a key unintentionally
operates a cylinder or lock
Terminology
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