Cam (of a cylinder)
A rotating piece attached to the end of the cylinder plug to engage the locking mechanism.
Case (of a lock)
The box containing the lock mechanism.
Catalyzed
In finishing, an ingredient added to a basic product to provide additional performance characteristics.
Center Match
An even number of veneer components or leaves of equal size (prior to edge trimming) matched with a joint in the center of the panel to achieve horizontal symmetry.
Chain Bolt
A spring bolt actuated by a chain attached to the spring bolt for application at the top of the door.
Chalk
White or other color chalk marks used by mills for some form of identification marking defects for repair.
Changes (Key)
The different bittings or tumbler arrangements in a series of locks.
Chatter
Lines appearing across the panel at right angles to the grain giving the appearance of one or more corrugations resulting from bad setting of sanding equipment.
Checks
Small slits running parallel to grain of wood, caused chiefly by strains produced in seasoning.
Chicken Tracks
Expression for scars which give the particular effect of a chicken's footprint. It is caused by air roots or vines.
Clustered
When a defect described in the grading rule is sufficient in number and sufficiently close together to appear to be concentrated in one area.
Comb Grain
A quality of rift veneer with exceptionally straight and closely spaced growth increments.
Component (of face)
An individual piece of veneer that is jointed to other pieces to achieve a full length and width face. Terms used interchangeably with component in the context of face are piece and leaf.
Composition Face Panels
A door face panel made of a wood derivative.
Continuous Hinge (also called Piano Hinge)
A hinge designed to be the same length as the moving part to which it is applied as, for example, the lid covering the keyboard of a piano.
Coordinator
A device used on a pair of doors to insure that the inactive leaf is permitted to close before the active leaf. Necessary when an overlapping astragal is present and exit devices, automatic or self latching bolts are used with closers on both door leaves.
Core
Innermost layer of section in flush door construction. Types of construction include: wood block; particleboard; wood block (lined); hollow; ladder; mesh or cellular.
Core (Wood Block)
Solid core of wood blocks or strips
Core (Particleboard)
Sold core of wood or other lignocellulose particles bonded together, cured under heat, and pressed into a rigid panel.
Core (Wood Block, Lined)
Solid core of two parts: a central wood block core bonded to two core liners of wood or other lignocellulose materials.
Core (Hollow)
Core assembly of strips or other units of wood, wood derivative, or insulation board, with intervening hollow cells or spaces which support outer faces.
Core (Ladder)
Hollow core composed of strips of wood, wood derivative, or insulation board with the strips running either horizontally or vertically throughout the core area with air cells and/or spaces between the strips and supporting the door faces.
Core (Mesh or Cellular)
Hollow core composed of strips of wood, wood derivative, or insulation board, interlocked and running horizontally, vertically, or diagonally throughout the core area with air cells and/or spaces between the strips and supporting the outer faces.
Crossbanding
Veneer placed between the core and face veneers of plywood face panels of wood flush doors in which the direction of the grain in 2-ply construction is at right angles to that of the face veneer.
Cross Bar
Type of figure or irregularity of grain resembling a dip in the grain, running at right angles, or nearly so, to the length of the veneer. Cross Break Separation of wood cells across the grain.
Custom Grade
The normal grade in both material and workmanship and intended for high-quality, conventional work.
Cylinder (of a lock)
The cylindrical shaped assembly containing the tumbler mechanism and the keyway, which can be actuated only by the correct keys.
Cylinder Collar
A plate or ring used under the head of a cylinder.
Cylinder Lock
A lock in which the locking mechanism is controlled by a cylinder.
Cylindrical (locks and latches)
A term used to describe bored locks which have a cylindrical case into which a separate latch bolt case that fits.
Cylinder Screws
The set screw that holds a cylinder in place by preventing the cylinder from being turned after installation.
Deadbolt (of a lock)
A lock bolt having no spring action nor bevel, and which is operated by a key or a turn piece.
Dead knots (also open knots)
Openings where a portion of the wood substance of the knot has dropped out, or where cross checks have occurred to present an opening.
Dead Lock
A lock equipped with a dead bolt only.
Deadlocking Latch Bolt
A latch bolt incorporating a plunger that is held in a retracted position when a door is closed, thus preventing the bolt from being retracted by end pressure.
Delamination
Separation of plies or layers of wood or other materials through the failure of the adhesive joint.
Discolorations
Stains in wood substances. Common are sap stains and blue stains.
Door Bolt
A manually operated rod or bar attached to a door providing means of locking.
Door Closer Bracket
A device whereby a door closer may be installed on the frame rather than directly on the door.
Door Closer or Check
A device combining a spring for closing and a compression chamber into which the liquid or air escapes slowly, thus providing a means of controlling the speed of the closing action.
Door Holder
A device that holds a door open at selected positions.
Door Pivot
A hinging device embodying a fixed pin and a single joint. Most types include lateral fastening.
Door Stop
A device to stop the swing or movement of a door at a certain point. Also an architectural term defining that part of a door frame against which the door closes.
Double-Throw Bolt
A bolt that can be projected beyond its first position, into a second, or fully extended one, thus providing extra security.
Doze
Form of incipient decay characterized by a dull and lifeless appearance of the wood, accompanied by a lack of strength and a softening of the wood substance.
Drivers
The upper set of pins in a pin tumbler cylinder, which, activated by the springs, project into the plug until raised by insertion of the key.
Drop Ring
A ring handle attached to a spindle which operates a lock or latch. The ring is pivoted but remains in a dropped position when not in use.
Dust-Proof Strike
A strike with a spring plunger that completely fills the bolt
hole when the bolt is not projected.
Dutch Door Bolt
Device for locking together the upper and the lower leaves of a Dutch door.
