- M -
MACS
abb. maximum
adjacent cut specification
magic
number
n. in a properly
combinated core, the numeric difference between the
control cut and the size of the top pin
magnetic
contact
n. an electrical
switch activated by magnetic attraction or repulsion
magnetic latch
n. a latch which
uses magnetic force to stay engaged with its strike
magnetic stripe
n. a thin layer of material consisting of
oriented ferromagnetic oxide particles held together by a
resin binder and bonded to a non-magnetic surface such as
paper or plastic
magnetically positioned pin
n. a pin tumbler requiring magnetic energy to position it, rather than
springs or gravity
maid's
master key
n. the master key
in a hotel master key system given to the maid. It
operates only cylinders of the guestrooms and linen
closets in the maid's designated area.
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
man door
n. a door designed to allow access by a person. It
may be located in a wall, or in another, larger,
door which has other purposes.
man
trap
n. a sally port
designed for pedestrian traffic
manipulate
v. a dialing process typically used with
combination locks to determine operational status of the
lock, potential combinations or attempt to free the
mechanism
manipulation
n. a opening method for mechanical combination
locks which uses the tolerances of that lock to determine an
opening combination
manipulation
key
n. any key other
than a correct key which can be variably positioned
and/or manipulated in a keyway to operate a lock or
cylinder
manipulation proof
n. a combination lock with features designed
to prevent determining the combination without physical attack
manipulation resistant
n. a combination lock with features that
prevent determining the combination without physical
attack within a specific time limit
manual dogging
n. 1. an exit device that requires a physical
action to dog it, v. 2. using a wrench or a special key to
dog an exit device
manufacturer reset code
n. in an electronic
lock, a factory-set or user-set code or combination that
will restore the factory default settings
master blank
n. a key blank used
in a complementary keyway lock, on which only the
master key combination is intended to be cut
master code
n. in an electronic lock, a factory-set or user-set
combination that must be used before programming the lock
master
disc
n. a special disc
tumbler with multiple gates to receive a sidebar, see
also "master pin" #1, see also "stepped
tumbler".
master
key
n. 1. 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, 3.
n. an automotive key which operates all or most locks on
a vehicle where there is also a valet key employed
master
key changes
n. the number of
different usable change keys available under a given
master key
master
key system
n. 1. any keying
arrangement which has two or more levels of keying 2. a
keying arrangement which has exactly two levels of keying
master
keyed
a dj. 1. 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) 2. a warded lock whose warding has been
designed to allow different hierarchies of keys to
operate
master
keyed only
adj. of or
pertaining to a lock or cylinder which is or is to be
combinated only to a master key
master
lever
n. a lever tumbler
which can align some or all other levers in its lock so
that their gates are at the fence. It is typically used
in locker locks.
master
pin
n. 1. 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
master
ring
n. a tube shaped
sleeve located between the plug and shell of certain
cylinders to create a second shear line. Normally the
plug shear line is used for change key combinations and
the shell shear line is used for master key combinations.
master
ring lock/cylinder
n. a lock or
cylinder equipped with a master ring
master
wafer
n. a ward used in
certain binary type disc tumbler key-in-knob locks, see
also "master pin" #1, see also "stepped
tumbler"
mat switch
n. a flat semi flexible device which opens or closes
a circuit when rated pressure is applied
matrix
format master keying
n. a method of
generating combinations and assigning key symbols in a
master key system through the use of a matrix
maximum
adjacent cut specification
n. the maximum
allowable difference between adjacent cut depths
maximum
compound cut specification
n. the maximum allowable
difference between the different depths of a compound cut
maximum
opposing cut specification
n. the maximum
allowable depths to which opposing cuts can be made
without breaking through the key blade. This is typically
a consideration with dimple keys.
MCCS
Abb. Maximum Compound Cut
Specification
media safe
n. a security container
designed to maintain an internal temperature at which multi-media
will remain reliable for a set period of time
mesh change
n. a type of hand change combination lock wheel,
consisting of an inner and outer wheel which engage each other
by intermeshing teeth
metal
desk lock
n. a cabinet lock
with a vertically sliding bolt located at the rear of the
cylinder
meter
lock
n. 1. a padlock
whose shackle consists of a single removable post,
designed for locking utility meters or valves. 2. any of
several small devices specifically designed to lock
utility meters or valves and which require either a key
or special wrench for removal
milling cutter
n. a key machine cutter with relatively coarse pitch
teeth as opposed to a rotary file cutter
milling
runout
n. the distinctive
shape caused by the curved surface of milling cutters
at the bow end of a key blade
mis-cut
1. adj. of or
pertaining to a key which has been cut incorrectly 2. n.
a mis-cut key
MK
abb. master key
MKCS
abb. modified key coding system
MK'd
abb. master keyed
MK'd
only
abb. master keyed
only
MK
section
abb. master key
section
MOCS
abb. maximum
opposing cut specification
modified key coding system
n. a modification of the standard key coding system, in which
the TMK of a system with three or more levels of keying has a single letter
name, and keys at lower levels are named following SKCS conventions
Mogul cylinder
n. a pin tumbler
cylinder with a diameter of 2.0", whose pins,
springs, key, etc. may also be proportionally increased
in size. It is frequently used in prison locks.
monitor pin
n. a device that requires a specific mechanical feature on a key, such
as a protrusion or the lack of a cut in a specific area, to allow the
lock to operate
monitored door
n. a door equipped with a device that reports, or reports and
records, the operational status of the door, lock or other hardware
mortise
1. v. to prepare by removing stock material from the
edge of a door, drawer, frame or opening to create a recess which allows
the flush fit or insetting of relevant lock or other hardware, 2. n. the
cavity prepared by mortising, 3. adj. of or pertaining to a locking
device designed to fit in a mortise preparation
mortise
cylinder
n. a threaded
cylinder typically used in mortise locks of American
manufacture
mortise exit device
n. an exit device designed for mortise
installation
mortise
lockset
n. a lockset the
case of which is designed to fit in a mortise in the
edge of a door or drawer
motion
alarm lock
n. a security locking device
which audibly alerts upon sensing motion
movable
key insert
n. any device pressed
into or connected to a key blank, such that its presence
and movement are required for proper key operation,
and the absence of which results in a lockout
movement
n. a mechanical,
electronic or electro-mechanical timer, designed to inhibit
the final unlocking of a combination lock or timelock
MP
abb. manipulation
proof
MR
abb. manipulation
resistant
MS
abb. Maximum Security. A trademark of the
Adams Rite Manufacturing Co.
mullion
n. a vertical
center post in the frame of a pair of doors
multi-color finish
adj. of or pertaining to a lockset whose
finish is different for different trim components on one
side of a door
multi-part key
n. any bit key not able to be duplicated by a single casting process
multi-point lock
n. a lock which has more than one bolt
which are thrown and withdrawn simultaneously, often in
more than one direction
multi-section
key blank
n. a key section
which enters more than one, but not all keyways in a
multiplex key system
multiple
gating
n. a means of
master keying by providing a tumbler with more than one
gate
multiplex
key blank
n. any key
blank which is part of a multiplex key system
multiplex
key system
n. 1. a series of
different key sections which may be used to expand a
master key system by repeating bittings 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
muntin
n. a structural member in a door or window
used to divide a large lite into smaller ones
mushroom
pin
n. a pin tumbler,
usually a top pin, which resembles a mushroom. It is
typically used to increase pick resistance
mykey chart
n. a matrix depicting user requested cross keying by
listing keys along one axis and openings along the other. So named
because it is frequently accompanied by the statement "My key goes
here and here and here."
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