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    Cabinet Locks Locks used in a variety of applications such as school lockers, store display cases, panels, desk drawers, showcases, letter boxes, sliding doors, wardrobe doors, file cabinets, chests, luggage and trunks, metal boxes cupboards and others.

    Caulking A waterproof material used to seal cracks.

    Cam A lever attached to the end of a barrel to activate the lock mechanism.

    Cam Lock A cylinder assembly where the cam acts as a lock bolt.

    Cap (of a lock) The removable lid of the case. Also called a cover plate.

    Carbon Steel An alloy of iron and carbon, with varying small proportions of other materials such as manganese, silicon and copper.

    Case Harden To produce a hard surface layer on steel by a process of heating, then rapidly cooling the metal in oil.

    Case (of a lock) The housing containing the mechanism.

    Casement A window whose frame is hinged at the side.

    Casing The framing around a door or window.

    Cavity Wall A masonry wall having an internal air space.

    Centre Pivot A special type of hanging device for heavy-duty doors that usually swing both ways (double acting).

    Centre-to-Centre Measurement from the centre of one member to the centre of another.

    Change Key See Servant Key.

    Channel A standard form of structural rolled steel, consisting of three sides at right angles in channel form.

    Circuit The path for an electric current.

    Classroom Lock a) Outside – opened by knob or lever except when knob or lever is made inoperative by keyfrom outside. The key locks or unlocks the outside knob or lever. b) Inside – opened by knob or lever at all times.

    Clearance A space intentionally provided between building parts, either to facilitate operation or installation, to ensure proper separation, to accommodate dimensional variations or for other reasons.

    Clutching A lock mechanism which allows the outside knob or lever to rotate free when locked. Unlocking then allows the knob or lever to withdraw the lockbolt to open the door.

    Cold Rolled A term applied to metal sheet or plate that has been brought to final thickness and finish being passed, unheated, between heavy rollers.

    Column A vertical supporting member.

    Combination Locking Latch A lock with various latching functions operated generally by knobs or levers both sides except when locked by key outside or by key or turnknob inside.

    Compressive Strength The property of a material that confers resistance to a crushing force.

    Concealed Hinge See Hinge.

    Condensation Water formed by warm, moist air contacting a cold surface.

    Conduit A pipe or trough that carries electrical wiring, cables and other services.

    Connecting Bar A bar connecting a barrel or turnknob to a lock mechanism.

    Construction Keying Systems used to allow contractors to gain entry to a building during construction but to prevent entry by the same contractors after the building has been occupied or handed over.

    Continuous Hinge See Hinge.

    Control Key A key used to remove the removable core from a removable core cylinder or lock.

    Coordinator A device used on a pair of doors to ensure that the inactive leaf closes first, before the active leaf. Necessary when an overlapping astragal is present, with certain exit device combinations and when automatic or self-latching bolts are used. Both door leaves must have closers.

    Coping A masonry cap on top of a wail to protect it from water penetration.

    Core Centre, inside

    Corner Bracket (Door Closer Bracket) A bracket that is connected to a door frame jamb and head at the upper hinge corner, to support an exposed overhead door closer.

    Corrosion The deterioration of metal by chemical or electrochemical action resulting from exposure
    to weather, moisture, chemicals or other agents. A form of oxidation.

    Court / Courtyard An open space surrounded partly or entirely by a building.

    Crawl Space The space between the floor joists and the surface below when there is no basement. This allows access to make repairs on plumbing and other utilities.

    Cremone Bolt A device, of surface application that by a turn of knob or lever handle, locks the door or the sash into the frame at top and bottom.

    Curtain A security device used in lever locks to partially close the keyhole when the key or any other implement is inserted and turned.

    Curved-Lip Strike A strike with a lip curved to conform to the detail of the door architrave.

    Cut An indentation or notch made in a key that enables it to turn. It may be either square or rounded. In tumbler locks, the cuts align the tumblers properly to allow the key to rotate. In warded locks the cuts clear the wards and allow the key to rotate.

    Cylinder The assembly incorporating the key-operated mechanism.

    Cylinder Core See Barrel.

    Cylinder Lock A lock having a mechanism operated by a cylinder.

    Cylinder Ring See Escutcheon.

    Cylinder Rose See Escutcheon.

    Cylindrical Locksets Locks with a cylindrical housing which have a separate latchbolt.