MNO

Master Key

One key that operates a number of locks where the individual locks each have their own, different key.  For further information, contact your locksmith.

Mortice Lock

The lock fits into a mortice that has been ‘cut out’ of a timber door edge. The locking action is achieved by a bolt that shoots out of the lock into the striker plate when the key is turned.

 

Mullion

The vertical member of a sash, window or door frame between openings in a multiple opening frame.

Multi-Point Lock

Describes a type of lock mechanism that has more than one locking point.  It usually has a minimum of three locking points (plus latch) spread strategically over the length of the door.  Multi-point locks are typically used on PVCu or composite doors.

Nightlatch

A lock which is mounted onto the surface of the door as opposed to being morticed into the edge of the door.  A nightlatch holds the door shut on a latch which can often be deadlocked into position.

Nightlatches are still sometimes referred to by their traditional name of 'rimlock' although a rimlock usually now refers to a basic security lock for use on internal doors, gates or outbuildings.