Locksmith-Dictionary M-P

   Locksmith Dictionary: Q - T
   Locksmith Dictionary: I - L

M (back to top)
  • master key A key which will open every lock in the master keyed suite.
  • master keyed (locks or latches) A lock or latch capable of being operated also by a master key as well as its own change or servant key.
  • master pins Small pins sometimes called wafers to build up chamber pin loading in pin tumbler master keyed cylinders.
  • mechanism (of locks or latches) The arrangement of the component parts and the manner in which they perform to achieve the required security and differing when operated by its key.
  • mortise A hole cut into the thickness of one edge of a door to receive a mortice lock or latch.
  • mortice lock (or latch) A lock or latch which is morticed to let into the thickness of the door from the meeting edge and held in position by screws through the forend.

N (back to top)
  • narrow case lock or latch A rim lock or latch, the case of which is made specially narrow, usually less than three inches wide, for fixing to the narrow stile of a panelled or flush door.
  • nightlatch A rim or mortice latch with a bevelled springbolt or roller bolt which shoots when the door is closed, but can be withdrawn by key from outside and by knob or lever handle from inside.
  • nozzle A circular boss or ferrule containing the keyhole on some cabinet locks, including locker locks. Correctly relating to lever cabinet locks.

O (back to top)
  • one-sided lock (single-entry) A lock which has a keyhole on one side only.
  • one-way action An action where the follower will turn only one way.
P (back to top)
  • pan The removable mechanism chamber attached to the inside face of a safe door.
  • panel grilles Steel grilles made to size with various infills of expanded diamond mesh, square weldmesh or fancy infills, usually fitted internally.
  • peg ward A combination of wards resembling a sash ward but fixed by pegs to the lock case.
  • pins Usually the lower of each pair of tumblers in the pin tumbler cylinder mechanism. The upper are known as drivers.
  • pin stack The combination of a lower pin sitting beneath an upper pin. In master keyed locks, additional master pins may be located between the lower and upper pins.
  • pin tumbler mechanism The mechanism incorporated in the cylinder or body of a cylinder pin tumbler lock, latch or padlock.
  • pipe key A key with a flat bit and a hollow circular shank to locate on the drillpin. Used only on one-sided locks.
  • plug The part of the lock that you put the key into, and which turns to operate the lock.
  • pre-assembled lockset A lock designed to be installed into a cutout in the edge of a door. The lock body and most or all of its trim need no further assembly other than securing it to the door.

Resources for Tools & Training Materials

Resources for Tools & Training Materials