A lock with furniture operated latch bolt and a deadbolt which is only operated from inside (usually with a thumb turn).
The vertical measurement between the centre of the key hole and the centre of the follower hole on a sash lock.
Pivoted claws on a deadlock which swing out sideways when the bolt is extended; these are usually used on sliding doors.
Deadlocking facility is usually achieved by an opposite turn of the key in the outside cylinder. It gives protection against slipping and internal handle manipulation.
Pivoted hook shaped bolt on a deadlock which swings down when operated; these are usually used on sliding doors.
Each lock is operated by the same key, an example of this could be that your front & back doors are operated by the same key for convenience.
Each lock is operated by its own key, this key should not operate any other locks (bearing in mind that there is a finite number of keying combinations (differs) available)
The bull nosed spring bolt which is usually operated by furniture and used to hold the door closed but not lock it closed.
Each lock is operated by its own key, this key should not operate any other locks however there is also a Master Key which will open any of the locks in the system. An example of this would be a block of flats where every tenant has their own key but the landlord has a single master key which will open any of the flats.
A rim or mortice latch which shoots when the door is closed, there is often an internal button which allows the bolt to be held in either the extended or withdrawn position.
A recess, groove or step of rectangular section, cut along the edge of a piece of timber to receive a mating piece.
A rebated component set is used to convert a mortice lock with a flat forend, into a full rebated lock.
A ring which usually fits around the face a rim or screw-in cylinder giving a tidier aesthetic appearance.
The button on the case of a rim nightlatch or other lock which holds the bolt in either the extended or withdrawn position.