Active Door: The leaf of a pair of doors (double doors), that opens first and has the locking or latching device. The other door is called the inactive door and opens when flush bolts or surface bolts are released.

Awning Window: A window that is hinged at the top or bottom and swings out.

Backset: The distance from the edge of the door to the centre of the door handle/spindle hole.

Bi-fold Doors: Two or more door panels that are hinged at one side. The doors fold or stack to one or both sides.

Casement Window: A window that is hinged on the side and swings open like a door. Casement Stays are used to hold these windows open. Casement Fasteners hold them closed.

Cylinder: The cylindrical-shaped assembly containing the tumbler mechanism and the keyway, which can be activated only by the correct keys.

Deadbolt: A heavy-duty door lock that has no spring action but is operated by a key or a thumb turn.

Double Doors: A pair of doors that meet in the middle of the door frame when closed.

Door Thickness: The measurement from outside front through to outside back of door.

Double Cylinder: A cylinder that is keyed both sides and usually used on external doors

Dummy Handle: Doorknob or lever that is surface mounted to a door and does not work a latch.

Face Plate: Refers to the piece of metal that surrounds the latch tongue and/or locking bolt of the door lock.

Flush Bolt: A door bolt mounted (flush) on the inside face or edge of a door. Most often used on the inactive door of a pair of doors on both aluminium and timber doors.

Friction Stays: hinges are a variable window hinge which enables the secure opening and closing of windows. As the name suggests, an adjustable friction slide helps to hold the window in an open position

Functions (Lock): A set of operating features for a particular type of lock or exit device which make it suitable for a specific application.

Handing (Door): A term used to designate direction in which a door swings. e.g., right hand or left hand indicating the swing path of a door.

Keyed Alike: A group of cylinders that can all be operated by the same key.

Keyed Different: Each cylinder is only operated by its unique key.

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

Rebated Doors: Rebated double doors have a lip on the vertical edge where they meet, called a ‘rebated meeting stile’. There is a primary door, which can open and close without affecting the secondary door. If the secondary door is opened, it needs to close fully into the frame before the primary door. Rebated doors create a seamless look with no gap between the doors and help in reducing drafts. A Rebated lock or latch with a special shaped face plate is required to fit this type of door.

Rim Lock: A low security lock which is mounted to the surface of a door.

Rollers: The rolling mechanism that allows the sliding door to roll back and forth.

Safety Stays: is a non-releasable restrictor for awning and casement windows, for those with safety and security in mind. The restrictor provides safe ventilation and deters unlawful entry.

Spindle: A square bar to which a doorknob or lever attaches. These can also be threaded to accommodate screw-on doorknobs

Striker Plate: A metal plate attached to the door jamb, which houses the extended latch or locking bolt when the door is closed.

Window Latch: A catch or locking-device for holding a window shut