Back Plate: Door knob escutcheon larger than a rosette. They come in many different sizes and shapes, and range from plain to highly decorative.

Backset: On a lock or latch, backset is the distance from the front of the face plate to the center of the door knob hub.

Bore: The hole drilled through the thickness of a door to allow a lock or latch to be installed.

Deadlatch: It is a latch which secures the door closed, but can be withdrawn by key from outside and by knob or handle from inside.

Deadlock: This is a standard mortice lock which is set into the edge of a door, with a square-ended bolt operated by key or by a thumb turn on the inside.

Door Set: A set of parts for one door which includes door handles and back plates and depending upon the function (passage, privacy ) may also include a latch, lock, strike plate and/or spindles.

Double Cylinder: Keyed cylinders on the inside and outside of an entry door that functions a deadbolt.

Set: Door knob that is surface mounted to a door and does not operate a latch.

Entry Handle: This is a door handle mounted on a large back plate which is used for doors or doors that do not latch.

Entry Mortise Lock: This is a large mortise lock that is operated by knobs, levers or thumb latches. It has either a modern keyed cylinder or a skeleton key operated deadbolt.

Escutcheon: Another name for a door plate, rosette or keyhole cover.

Faceplate: This is the plate on the front of a lock or latch which is visible on the edge of a door.

Finish: This is the surface appearance of a metal hardware which is achieved through various chemical and mechanical means.

Flush Bolt: A flush bolt is a bolt which is mortised into the edge of a door at the top and/or bottom and is typically used to hold the passive door, of a set of double doors, closed.

Half-mortise Hinge: This is a hinge where one leaf is mortised into the door jamb while the other is mounted to the front surface of the door.

Hand: This refers to the direction of opening a door.

Keyhole Cover: It is a small escutcheon for decorating a keyhole in a door.

Kick Plate: A plate which spans the bottom of a door to protect the wood on heavy traffic doors.

Lacquer: It is a surface coating which is used to protect the finish of a metal from oxidizing.

Latch Bolt: This is the "tounge" piece of a latch or lock which holds the door closed when the door knob is released.

Lever: This is the part inside a lock which is moved by the key and allows the lock to be operated.

Loose Pin: This refers to hinges which have one finial attached to the hinge pin and it can be pulled out easily to separate the two leaves of the hinge.

Mortise Lock: This is an old style box lock which is installed into a deep pocket or "mortise" in the edge of the door. Usually, the mortise lock houses both the latch and dead bolt in one unit.

Non-mortise hinge: It is a hinge which has thin leaves allowing them to be mounted on the edge of a door without having to be mortised.

Parliament Hinge: This is an "H" shaped hinge that is wider than it is tall to allow for a door or window to swing clear of the trim and lay flat when opened.

Passage Set: It is a door set in which there is a latch but no lock.

Privacy Set: A door set which has a latch and a locking feature, ideal for bedrooms or bathrooms or any other private rooms. Tubular privacy sets use a push button which disables the latch on one side of the door while a privacy mortise locks sets use a thumb turn to operate a deadbolt lock.

Push Plate: It is a type of door plate which is used to protect the wood of a door which closes automatically and usually has a pull handle on the other side.

Rim Lock: This is a box type door lock which is mounted to the surface of a door typically used for thin doors.

Rose: It is a circular plate on which the moving parts of a handle or knob are mounted.

Screen Door: It is wooden door between 7/8" and 1 5/8" thickness and has a screen or glass pane.

Screen Door Hinge: It is a surface mounted hinge with spring tension to make the door swing shut.

Spindle: This is the square bar inserted through a latch and it connects the handles on either side of the door.

Strap Hinge: It is a long surface mounted hinge used on doors.

Strike Plate: The plate with cutouts that is attached to the door jamb into which the latch and dead bolt are trapped to either lock a door.

Surface Bolt: It is a bolt usually of brass or iron which is mounted to the door or window surface and locks into a strike plate on the door jamb to hold the door closed.

Surface Hinge: Also known as flush or full surface, it is a which is mounted to the face of the door and door frame so that the entire hinge is visible when the door is closed.

Tubular Latch: It is a cylindrical door latch that is installed into the edge of the door and is operated by a knob or lever with the help of the spindle.

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