Locksmith Glossary - M

Source: Lock Industry Standards and Training (LIST) Council

(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.

(v.) A dialing process typically used with combination locks to determine operational status of the lock, potential combinations or attempt to free the mechanism.

(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.

Source: Lock Industry Standards and Training (LIST) Council

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.
(n.) 2. A keying arrangement which has exactly two levels of keying.

Master Key
(n.) 1. A key that opens every one of a given set of locks. Also called passkey.
(n.) 2. Key that secures entrance everywhere.

Source: Dictionary.com

(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.
(v.) 2. 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.
(n.) 3. An automotive key which operates all or most locks on a vehicle where there is also a valet key employed.

Source: Lock Industry Standards and Training (LIST) Council

Master Keyed
(adj.) 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).
(adj.) 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.
(n.) 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.

Source: Lock Industry Standards and Training (LIST) Council

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.

(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.
(n.) 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.

(adj.) 1. Of or pertaining to a key which has been cut incorrectly.
(n.) 2. A mis-cut key.

(abb.) Master Key

MK Section
(abb.) Master Key Section

(abb.) Master Keyed

MK'd Only
(abb.) Master Keyed Only

(abb.) Maximum Opposing Cut Specification

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.

(v.) 1. 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.
(n.) 2. The cavity prepared by mortising.
(adj.) 3. 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 Lock
(n.) A lock installed in a hollowed out or mortised cavity.

Source: Dictionary.com

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.

(n.) A mechanical, electronic or electro-mechanical timer, designed to inhibit the final unlocking of a combination lock or timelock.

(abb.) Manipulation Proof

(abb.) Manipulation Resistant

(abb.) Maximum Security. A trademark of the Adams Rite Manufacturing Co.

(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.
(n.) 2. A keying system which uses such keyways and key sections.

(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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