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Application Solutions
Glossary
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Active Door (in a pair of doors): The
leaf that opens first and the one to which the
lock is applied.
AHC: Indicates that the individual so
identified is a qualified Architectural Hardware
Consultant and member of the Door and Hardware
Institute.
Anti-Friction Bearing: Any bearing having
the capability of effectively reducing friction.
Anti-Friction Latch Bolt: A latch bolt
de signed to reduce friction when the bolt starts
to engage the lock strike.
Architectural Hardware: Term applied to
all hardware used in building construction but
particularly that used on or in connection with
doors, windows, cabinets and other movable members.
Armored Front: A lock that consists of
two plates: one, the under plate, is fastened
to the case and is unfinished; two, the finish
plate, is fastened to the under plate and when
in place covers the cylinder set screws thus protecting
them from tampering. Used on mortise locks.
Armor Plate: A plate similar to a kick
plate but covering the door to a greater height,
usually 40" (1040 mm) or more from the bottom.
Astragal: A molding or strip whose purpose
is to cover or close the gap between the edges
of a pair of doors. Some types overlap, others
meet at the center line of the gap. (See Coordinator.)
Auxiliary Dead Latch: A supplementary
latch that automatically deadlocks the main latch
bolt when the door is closed. (Also called Deadlocking
Latch Bolt.)
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Back Check: Optional feature in hydraulic
door closers slowing the opening swing of door
somewhere between 60 and 85 degrees of opening.
Designed to protect an object be hind the door.
Not intended to act as an overhead stop.
Backset (of a lock): The horizontal distance
from the face of the lock to the center line of
knob hub, keyhole or cylinder. (Measured from
the high side of a beveled door.)
Backset (of a hinge): The distance from
the edge of the door to the hinge.
Ball-Bearing Hinge: A hinge equipped with
ball bearings between the hinge knuckles to reduce
friction (See Anti-Friction Bearing.)
Bevel (of a door): The angle of the lock
edge in relation to the face of the lock stile.
Standard bevel is 1/8" in 2" (3.2 mm in 50.8 mm).
If otherwise detailed it must be so noted in ordering
locks.
Bevel (of a lock): A term used to indicate
the direction in which the latch bolt is in dined:
regular bevel for doors opening in, reverse bevel
for doors opening out.
Bevel (of a lock front): The angle of
a lock front when not at right angle to the lock
case, allowing the front to be applied flush with
the edge of a beveled door
Bit (of a key): The projecting blade,
cut in a manner that actuates the tumblers and
permits the lock bolts to be operated.
Bored Lock (or Latch): Lock or latch whose
parts are intended for installation in holes bored
in a door
Box Strike: A strike that also provides
a complete housing to protect the bolt openings.
Builders Hardware: See Architectural Hardware.
Butt (Hinge): A type of hinge designed
for mortising into the edge of the door and into
the rabbet of a door frame.
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Cam (of a cylinder): A rotating piece
attached to the end of the cylinder plug to engage
the locking mechanism.
Cane Bolt: A heavy cane-shaped bolt with
the top bent at right angles; used on the bottom
of doors.
Case (of a lock): The box containing the
lock mechanism.
Casement Hinge: A hinge to swing a casement
window. The term is often used to describe a hinge
designed to throw the sash out far enough to permit
cleaning the outside of the glass from the inside
of the room on an outward-swinging casement.
CDC: Indicates that the individual so
identified is a Certified Door Consultant and
member of the Door and Hardware Institute.
Chain Bolt: A spring bolt actuated by
a chain attached to the spring bolt for application
at the top of the door.
Chain Door Fastener: A device that limits
the opening of a door by means of a chain.
Changes (Key): The different bittings
or tumbler arrangements in a series of locks.
Checking Floor Hinge: A device placed
in the floor that combines top and bottom pivots
for hanging the door with a controlled speed dosing
mechanism.
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 ensure that the inactive leaf is per
mined to dose 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.
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, top and bottom.
Cup Escutcheon: A door plate, for use
on sliding doors, having a recessed panel to afford
finger hold and to contain a flush ring and sometimes
a cylinder, all being flush with the surface of
the plate.
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 fits.
Cylinder Screw: The set screw that holds
a cylinder in place by preventing the cylinder
from being turned after installation.
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Deadbolt (of a lock): A lock bolt having
no spring acton nor bevel, and which is operated
by a key or a turn piece.
Deadlock: 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 dosed, thus preventing the bolt
from being retracted by end pressure.
Dogging Device: As used in exit devices,
a mechanism that fastens the cross bar in the
fully depressed position, and also retains the
latch bolt or bolts in a retracted position, thus
permitting free operation of the door from either
side.
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 dosing and a compression chamber
into which the liquid or air escapes slowly, thus
providing a means of controlling the speed of
the dosing 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.
Drawer Roller: A device used to ease the
sliding of a drawer open or shut, usually with
a metal or fiber wheel rotating in a metal frame.
Drawer Slides: A mechanism employing guides
and rollers that guide and support the drawer,
permitting easy operation.
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 Escutcheon (or Key Plate): One having
a pivoted plate that covers the key hole.
Drop Ring: A ring handle attached to a
spindle that operates a lock or latch. The ring
is pivoted but remains in a dropped position when
not in use.
Dummy Cylinder: A mock cylinder without
any operating mechanism for use where effect is
desired.
Dummy Trim: Trim only, without lock; usually
used on the inactive door in a pair of doors.
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.
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Edge Plate: An angle or channel-shaped
guard used to protect the edge of a door.
Edge Pull: A pull mortised into the edge
of a sliding door.
Elbow Catch: A spring-loaded device embodying
a rocker arm and angle strike, for locking the
inactive leaf of a pair of cabinet locks.
Electric Strike: An electrical device
that permits releasing of the door from a remote
control.
Escutcheon (Elongated): A plate long enough
to span a lock case and having holes for knob
bushing, bit key, cylinder, turn knob and similar
operating members as required.
Escutcheon (Key): See Key Plate.
Exit Device: A door-locking device de
signed to grant instant exit by pressing on a
cross bar that releases the locking bolt or latch.
Extension Flush Bolt: A flush bolt in
which the connection between bolt head and operating
mechanism is by means of a rod inserted through
a hole bored in the thickness of the door.
Extension Link: A device used to provide
long backsets in bored locks.
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Face (of a lock): The exposed surface
that shows in the edge of a door after installation.
(See Front.)
Fast Pin Hinge: One in which the pin is
fastened permanently in place.
Finish Builders Hardware: Hardware that
has a finished appearance as well as a functional
purpose and that may be considered a part of the
decorative treatment of a room or building. Also
termed Architectural Hardware, Finish Hardware
and Builders Finish Hardware.
Fire Exit Bolt: See Exit Device.
Floor Closer: A closing device installed
in the floor under a door.
Floor Hinge: A combined pivot hinge and
closing device set either in the floor or in the
bottom of the door. It may be spring type only
or may be combined with liquid control.
Flush Bolt: A door bolt so designed that
when applied it is flush with the face or edge
of the door.
Flush Cup Pull: A pull mortised flush
into a door, having a ring pull that folds Hat
into the cup of the pull.
Flush Ring: A flush door pull mortised
in a door, having a ring pull that folds flat
into the cup of the pull.
Foot Bolt: A type of bolt applied at the
bottom of a door and arranged for foot operation.
Generally the bolt head is held up by a spring
when the door is unbolted.
Friction Catch: Any catch which when it
engages a strike is held in the engaged position
by friction.
Friction Hinge: A hinge designed to hang
a door and hold it at any desired degree of opening
by means of friction control incorporated in the
knuckle of the hinge.
Front (of a lock): The plate through which
the latching or locking bolts project. (See Face.)
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Grand Master Key: A key that operates
locks in several groups, each of which has its
own master key.
Guard Bar: A series of two or more cross
bars generally fastened to a common back plate
to insure protection of glass or screen in a door.
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Hand (of a lock, etc.): A term used to
indicate the direction of swing or movement, and/or
locking security side of a door.
Handed (locks, etc.): A term used to indicate
that the article is for use only on doors of the
designated hand.
Harmon Hinge: A hinge designed to swing
a door into a pocket at a right angle with the
frame.
Hasp: A fastening device consisting of
a loop and a slotted hinge plate, normally secured
with a padlock.
Hinge: Two plates pined together by a
pin and attached to a door and its frame whereby
a door is supported and is enabled to swing or
move.
Hinge Stile (of a door): The stile to
which the hinges are applied as distinguished
from the lock stile.
Horizontal Spring Hinge: A spring hinge
mortised horizontally into the bottom rail of
a door and fastened to the floor and head frame
with pivots.
Hub: The part of a lock through which
the spindle passes to actuate the mechanism.
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Inactive Door (or leaf): That leaf of
a pair of doors that does not contain a lock,
but is bolted when closed, and to which the strike
is fastened to receive the latch or bolt of the
active door.
Indicator Button: A device used in connection
with a hotel lock to indicate whether or not the
room is occupied.
Integral (locks and latches): A term used
to describe a type of mortise lock having cylinder
in the knob.
Invisible Hinge: A hinge so constructed
that no parts are exposed when the door is closed.
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Keeper: Synonymous with Strike.
Key Change: The combination of cuts in
a key that enable it to operate the lock for which
intended.
Key Plate: A small plate or escutcheon
having only a keyhold.
Keyway: The aperture in lock cylinders
that receives the key and closely engages with
it throughout its length.
Kick Plate: A protective plate applied
on the lower rail of the door to prevent the door
from being marred.
Knob: A projecting handle for operating
a lock.
Knob Shank: The projecting stem of a knob
into which the spindle is fastened.
Knob Top: That part of the knob that the
hand grasps.
Knuckle: The enlarged part of a hinge
into which the pin is inserted.
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Latch Bolt: A beveled spring bolt, usually
operated by a knob, handle or turn.
Leaf (of a pair of doors): One of the
two doors forming a pair of doors.
Letterbox Back Plate: A plate, similar
to a letterbox plate, attached to the inside of
a door to allow the passage of mail.
Letterbox Plate: A date attached to the
door with an opening to permit insertion of mail.
Lever Handle: A horizontal handle for
operating the bolt(s) of a lock.
Lever Tumbler: Flat tumbler having a pivoted
motion actuated by the turning of the key and
controlling the locking function.
Lip of a Strike: The projecting part on
which the latch bolt rides.
Lock Rail (of the door): The horizontal
member of a door intended to receive the lock
case.
Lock Set: A lock, complete with trim,
such as knobs, escutcheons or handles.
Lock Stile (of a door): The stile to which
the lock is applied as distinguished from the
hinge stile.
Loose Joint Hinge: A hinge having but
two knuckles; the pin is fastened permanently
to one knuckle, the other contains the pinhole,
whereby the two parts of the hinge can be disengaged
by lifting. These hinges are handed.
Loose Pin Hinge: A hinge having a removable
pin to permit the two parts of the hinge to be
separated.
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Magnetic Catch: A cupboard catch that
uses a magnet to hold the door closed.
Master Key: Operates any quantity of cylinders
of different individual key changes.
Masterkeying: An arrangement of cylinders
having individual key changes, which permits them
all to be operated by a simple key called a master
key.
Mono Lock: See Preassembled Lock.
Mop Plate: A narrow plate similar to a
kick plate, of sufficient height to protect against
the swish of the mop.
Mortise: A cavity made to receive a lock
or other hardware; also the act of making such
a cavity.
Mortise Bolt: A door bolt designed to
be mortised into a door rather than applied to
its surface.
Mortise Lock (or Latch): A lock designed
to be installed in a mortise rather than applied
to the door's surface.
Mullion: A fixed or movable post dividing
an opening vertically.
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Nightlatch: An auxiliary lock having a
spring latch bolt and functioning independently
of, and providing additional security to, the
regular lock of the door.
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Olive Knuckle Hinge: A paumelle hinge
with knuckles forming an oval shape.
Overhead Concealed Closer: A closer concealed
in the head frame with an arm connecting with
the door at the top rail.
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Panic Exit Device: See Exit Device.
Paracentric: A term used in connection
with cylinder plugs having projections on the
sides of the keyway that extend beyond the vertical
center line of the keyway.
Paumelle: A style of hinge embodying a
single pint of the pivot type, generally of modern,
or streamlined design.
Pin Tumblers: Small sliding pins in a
lock cylinder, working against coil springs and
preventing the cylinder plug from rotating until
the pins are raised to the proper alignment by
bitting of key.
Pivot: See Door Pivot.
Plug (of a cylinder): The round part containing
the keyway and rotated by the key to transmit
motion to the bolt(s).
Preassembled Lock: A lock that has all
the parts assembled as a unit at the factory,
and when installed in a rectangular notch cut
into the door edge, requires little or no disassembly.
Prison Lock: A heavy lock designed especially
for use on jail cells.
Push Plate: A plate applied to the lock
stile to protect the door against soiling and
wear
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Quadrant (Dutch Door): A device to fasten
together the upper and the lower leaves of a Dutch
door.
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Rabbet: A term used to describe the abutting
edges of a pair of doors or windows so shaped
as to provide a tight fit. One half of the edge
projects beyond the other half, usually 1/2 .
Also used to define that portion of a door frame
into which the door fits.
Rabbeted Lock (or Latch): A lock in which
the face conforms to the rabbet found on a rabbeted
door.
Rail (of a door): A horizontal member
that pins the stiles. May be exposed as in a paneled
door, or concealed as in a flush door
Reinforcing Unit: A metal box-shaped reinforcement
for use in a metal door in which a bored lock
is to be installed. It provides both vertical
and horizontal latch support.
Reverse Bevel: See Bevel.
Reversible Lock: A lock which, by reversing
the latch bolt, may be used by any hand. On certain
types of locks, other parts must also be changed.
Rigid Lock: See Preassembled Lock.
Rim: A term indicating articles of hardware
designed for application to the surface of doors
and windows.
Roller Latch: A friction door latch employing
a roller latch head under spring tension, which
engages a strike having a recess formed to receive
the roller.
Roller Strike: A strike having a rolling
member at the point of latch bolt contact to minimize
friction.
Rose: A trim plate attached to the door
under the knob. It sometimes acts as a knob bearing.
Rounded Front: A lock or bolt front conforming
to the rounded edge of a double acting door. The
standard radius is 4" (101.6 mm).
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Sash Balance: A spring device used to
counterbalance the weight of a window sash or
other vertical sliding part.
Sash Center: A pivoted support for transom
or sash and comprised of two parts, one of which
contains a pivot, the other a socket for the pivot.
Sash Chain: A metal chain adapted for
use with sliding sash, attached to the sash and
to the counterbalancing sash weight.
Sash Cord: Cord or rope used similarly
to sash chain and in place of chain.
Sash Cord Iron: A small metal holder inserted
in the edge of the sash, to which sash cord or
sash chain is attached.
Sash Fast: A fastener attached to the
meeting rail of double-hung windows.
Sash Lock: A sash fast with a locking
de vice controlled by a key
Sash Pole: A wood or metal pole to which
a sash pole hook is attached.
Sash Pole Hook: A metal hook attached
to a wooden or metal pole used to lower or raise
a transom or sash beyond hand reach.
Sash Pulley: A pulley mortised into the
frame of a double-hung sash frame over which the
sash cord or sash chain passes.
Sash Socket: A metal plate containing
a hole or cup to receive a sash pole hook
Sash Weight: A weight used to balance
sliding sash, usually of cast iron or, if conditions
require, of lead.
Screen Door Latch: A small locking or
latching device used on screen doors and operated
by a knob or a lever handle.
Screwless Knob: A knob attached to a spindle
by means of a special wrench as distinguished
from the more commonly used side knob screw.
Screwless Rose: A rose with concealed
method of attachment.
Secret Gate Latch: A surface-applied latch
operated by a concealed button or other device;
usually used on office gates.
Shank (of a knob): The projecting stem
of a knob into which the spindle is fastened.
Shelf Pin: A pin for supporting a shelf;
also called a shelf support or shelf rest.
Shutter Operator (also called a Shutter Worker):
A device incorporating a hinge and a method of
opening or closing a shutter by means of a crank
or turn from inside without opening window.
Side Knob Screw: A set screw used to fasten
a knob to a spindle.
Signal Sash Fastener: A sash fastening
device to lock double-hung windows that are beyond
reach from the floor It has a ring for a sash
pole hook. When locked, the ring lever is down;
when the ring lever is up, it signals by its upright
position that the window is unlocked.
Spindle (of a knob): The bar or tube connected
with the knob or lever handle that passes through
the hub of the lock or other wise engages the
mechanism to transmit the knob action to the bolt(s).
Split Astragal: An astragal that is split
through the middle, allowing each door leaf to
operate independently
Spring Hinge: A hinge containing one or
more springs to move the door into the de sired
position. It may be either single or double acting.
Stile (of a door): A vertical member of
the door structure; each door has two, a lock
stile and a hinge stile.
Stop (of a lock): The button, or other
small device, that serves to lock the latch bolt
against the outside knob or thumb piece or unlock
it if locked. Another type holds the bolt retracted.
Store Door Handle: A heavy grip or pull
mounted on sectional or elongated plates and provided
with a thumb piece to operate the latch trip of
a store door lock.
Strap Hinge: A surface hinge of which
one or both leaves are of considerable length.
Strike: A metal plate or box that is pierced
or recessed to receive the bolt or latch when
projected. Sometimes called Keeper.
Surface Hinge: One having both leaves
surface applied.
Swinging Latch Bolt: A bolt that is hinged
to a lock front and is retracted with a swinging
rather than a sliding action. Sometimes called
Hinged Latch Bolt.
Swivel Spindle: A spindle having a joint
midway in its length to permit the knob at one
end to be made rigid by the stop works while the
other end is free to operate.
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T Handle: A cross handle for actuating
the bolt of a lock and used in place of a knob.
T Hinge: A surface hinge with the short
member attached to the jamb and the long member
attached to the door.
Template Hardware: A term indicating any
item of hardware that is made to template; that
is, exactly matching the master template drawing
as to spacing of all holes and dimensions.
Thimble: The socket or bearing attached
to an escutcheon plate in which the end of the
knob shank rotates.
Three-Point Lock: A device sometimes required
on three-hour fire doors to lock the active leaf
of a pair of doors at three points.
Threshold: A strip fastened to the floor
beneath a door, usually required to cover the
joint where two types of floor material meet.
Throw (of a deadbolt or latch bolt): Measurement
of the maximum projection when bolt is fully extended.
Thumb Piece (of a handle): The small pivoted
part above the grip of a handle to be pressed
by the thumb to operate a latch bolt.
Transom Bar: That part of a door frame
that separates the top of a door or a window from
the bottom of the transom
Transom Catch: A fastener applied to a
transom and having a ring by which the latch bolt
is retracted.
Transom Chain: A short chain used to limit
the opening of a transom; usually provided at
each end with a plate for attachment.
Transom Lift: A vertically operated device
attached to a door frame and transom by which
the transom may be opened or closed.
Tubular Lock (or Latch): A type of bored
lock
Tumbler: A guard or obstruction that pre
vents operation of a bolt except by insertion
of the proper key
Turn Piece: A small knob, lever or tee
turn with spindle attached for operating the deadbolt
of a lock or a mortise bolt.
Two-Point Latch: A device sometimes required
on three-hour fire doors to lock the inactive
leaf of a pair of doors at top and bottom.
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Unit Lock: See Preassembled Lock.
Universal: A term used to describe a lock,
a door closer or other device that can be used
on doors of any hand without change.
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Vertical Spring Pivot Hinge: A spring
hinge mortised into the heel of a door and fastened
to the floor and head with pivots.
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Ward: An obstruction projecting from the
lock case of side of a keyhole intended to prevent
entrance or rotation of an improperly cut key.
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