Glossary of Terms

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M

  1. Master Key

    Operates any quantity of cylinders of different individual key changes. 

    Related Categories –
    Locks, Cylinders, Cores, Keyblanks
    Related Terms –
    Grand Master Key
    Masterkeying
  2. Masterkeying

    An arrangement of cylinders having individual key changes, which permits them all to be operated by a single key called a master key. 

    Related Categories –
    Locks, Cylinders, Cores, Keyblanks
    Related Terms –
    Grand Master Key
    Master Key
  3. Mortise

    A cavity made to receive a lock or other hardware also the act of making such a cavity. 

    Related Categories –
    Locks, Cylinders, Cores, Keyblanks
    Related Terms –
    Mortise Lock (or Latch)
  4. Mortise Lock (or Latch)

    A lock designed to be installed in a mortise rather than applied to the door’s surface. 

    Related Categories –
    Locks, Cylinders, Cores, Keyblanks
    Related Terms –
    Mortise
  5. Mullion

    A fixed or movable post dividing an opening vertically used with a pair of doors. 

    Related Categories –
    Exit Devices
Glossary
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