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«A DICTIONARY OF LOCKSMITHING By KEITH MAYERS Keith A. Mayers San Diego, CA A Dictionary of Locksmithing ii. NOTE: The user will find information ...»

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NETTLEFOLDS LOCK – An old style lock with two side bolts which protrude out of the main bolt near its end and retract into a hollow in the main bolt during unlocking. The bolt assembly is sometimes called a fly bolt.

NEUTRAL KEY – A key used to open and close changeable tumbler safe deposit locks when the safe deposit box is unrented and the combination tumblers are set to a neutral position. Also called vacant box key or set-up key.

NIB WARD – A ward formed by pressing a portion of a lock case or a lock cap made of sheet metal into the lock interior.

NICKEL SILVER – An alloy of copper, zinc and nickel, similar to brass but harder and tougher because of the addition of nickel.

Nickel silver is used to make cylinder keys.

NIGHT BOLT – An auxiliary bolt in a hotel bedroom lock which is finger controlled from the inside of the room only.

NIGHT LATCH – An auxiliary door lock with a spring latch, used in addition to the door’s primary lock; operated from the outside by a rim cylinder and from the inside by a thumb turn. A night latch is mounted on the inside surface of a door with its rim cylinder mounted in a hole through the door. Also called a rim night latch.

NIGHT WORKS – Another name for stop works.

A Dictionary of Locksmithing 47 NON-CHANGEABLE LEVER – See fixed tumbler.

NON-FERROUS METAL – Any metal or alloy of metals which does not contain iron and is therefore non-magnetic and will not rust.

NOSE – Another name for a safe deposit or cabinet lock horn. Also, the top edge of the bit of a bit key, parallel to the post. Also, the projection on the lever of a combination lock which engages the notch of the drive cam to retract the bolt.

NOSE PLATE – A collar sometimes used to encircle the nose of some small cabinet locks in the manner of a cylinder ring.

NOSE PULLER – A safe deposit lock tool which uses the mechanical advantage provided by a screw thread to pull the nose out of a safe deposit lock and thereby breach the lock’s security.

NOZZLE – Another name for a safe deposit or cabinet lock horn.

OFFICE FUNCTION LOCK – A lockset in which both knobs work latchbolt (in some cases outside key and inside knob work latchbolt); outside key and either inside key or inside turnpiece, if part of lock, work deadbolt; stop button locks outside knob; inside knob and outside key release stop button.

ONE-WAY SCREW – A screw with either special threads or a specially cut screwdriver blade slot which prevent easy removal.

OPENING INDEX – The index to which a combination is dialed when opening a combination lock. See changing index.

OPERATING SHEAR LINE – The primary shear line of an interchangeable core which controls the rotation of the plug and the opening of the lock. It is the gap between the plug and the sleeve.

See also control shear line.

OPTHALMOSCOPE – A physician’s instrument for examining eyes and ears, used by locksmiths for peering into small, dark openings, such as keyways. See also illuminated magnifier scope.

ORIGINAL KEY – A key or key blank made for a lock by its manufacturer.

PADLOCK – A portable lock with hinged or sliding shackle.

A Dictionary of Locksmithing PALACE MOTION – An action used in mortise and rim locks in which the hub works directly against the foot of the bolt and alternately against a crank so that the bolt will move with approximately the same ease when the knob is turned in either direction.

PANEL LOCK – A lock specially designed to fit standard metal casement doors.

PANIC BOLT – A door bolt released by pressing on an easily accessible cross bar for instant exit, especially on emergency doors in public buildings. Also called a panic exit lock.

PANIC EXIT LOCK – See panic bolt.

PARACENTRIC KEY – A key for a cylinder lock with milled grooves to fit a standard paracentric keyway, as opposed to a bit key, a flat key, a tubular key and so on. The grooves run parallel with the edges of the blade and cross the blade’s vertical center line. Also called a cylinder key and, sometimes, a grooved key.

PARACENTRIC KEYWAY – A keyway in a cylinder lock with one or more side wards on each side projecting beyond the vertical center line of the keyway to hinder picking.

PASSAGE FUNCTION LOCK – A lockset without key in which turning either inside or outside knob will retract latchbolt.

PASSAGE SET – A lockset for doors which do not need locking and on which either the inside or the outside knob opens the springbolt at all times.

PASSING – The ability of a key to open a lock or a set of locks. A key passes a lock when it opens the lock.

PASSKEY – A master key or a skeleton key PEENING – The process of enlarging the surface around a piece of metal by hammering it.

PEG WARD – A type of sash ward fixed to a lock case with pegs.

See sash ward.

PHANTOM KEY – A key which operates a cylinder by means of unwanted cross-keying, or interchange. Phantom keys have key cuts proportional to any random combination of the master and bottom A Dictionary of Locksmithing 49 pins set in the cylinder.

PHOSPHER BRONZE – A bronze alloy with a small amount of phosphorus added to make it tough and springy. Phosphor bronze is used extensively for small springs such as are used in locks.

PICK – One of a number of tools for manipulating the tumblers of a lock so that the pins separate at the shear line to permit turning the plug and opening the lock without using its key.





PICK GUN – A hand-held vibrating tool with a lock pick attached to aid a skilled operator in manipulating a lock’s tumblers away from its shear line.

PICK KEY – A key filed so that only a narrow projection at the tip remains for lifting lever tumblers one at a time while picking a lever tumbler lock.

PICKING – The manipulation of the tumblers of a lock with small tools called picks inserted through the keyway so that the tumblers line up and the lock can be opened. See also raking.

PIN – A pin tumbler. Also, as a verb, the action of setting pins of various lengths in cylinders to match a chosen combination. Also, a name used in England for the post of a bit key.

PIN CHAMBER – One of a number of holes bored in the cylinder housing and plug of a pin tumbler lock, perpendicular to and penetrating into the keyway, to hold the lock’s pin tumblers. The upper chambers are in the housing, the lower chambers are in the plug.

PINNING CHART – A chart which shows the combinations of pin lengths needed to pin all the cylinders in a master key system.

PIN PUNCH – A drift punch used for removing jammed pins.

PIN STACK – The total height of the top, master and bottom pins in a cylinder chamber.

P1N TRAY – A tray with grooves or depressions for holding pin tumblers in proper sequence while working on a pin tumbler lock.

PIN TUMBLER – One of a number of small cylindrical brass pins which slide up and down in the pin chambers of a cylinder lock, preventing the cylinder plug from turning except when none of the A Dictionary of Locksmithing pin tumblers cross the shear line. See also tumbler. disc tumbler, wafer tumbler.

PIN TUMBLER SPRING – Small compression spring which fits into a pin chamber in a lock to force the pins down into the keyway.

PIN TUMBLER TWEEZERS – Small tweezers with hollows filed near the tip of each prong, facing one another, to help a locksmith hold pin tumblers with ease.

PIN VISE – A hand-held, small-tool holder with a split jaw chuck.

PINNING – The filling of the pin chambers of a pin tumbler cylinder with pins which match a selected combination of key cuts.

PIPE KEY – The British name for a barrel key.

PIPPIN FILE – A file with a cross section shape similar to an apple seed, from which its name comes, or to a teardrop.

PITT’S FITTING – A door knob fitting in which the knob cannot be removed from the rose but is free to turn in it.

PLUG – The round core of a cylinder lock, fitted into a hole in the cylinder, into which the keyway is broached and through which the key transmits turning motion to the locking mechanism.

PLUG FOLLOWER – A round shaft of the same diameter as a plug used to push the plug out of its cylinder housing while keeping the spring-loaded driver pins in place.

PLUG HOLDER – A tool shaped to hold the plug of a pin tumbler lock during servicing.

PLUG RETAINER – That part of a cylinder lock, usually fixed to the rear of the plug, which holds the plug in place in the cylinder housing. Also called the retaining ring or the retainer.

PLUG SPINNER TENSION WRENCH – A coiled tension wrench made of spring steel to permit a locksmith who has accidentally picked a lock in the wrong direction to flip the plug chambers quickly past the shell chambers without repicking the lock.

POCKET – One of the two rectangular holes on either side of the bar of a lever tumbler in which the fence rests when the bolt is either fully extended or fully retracted.

A Dictionary of Locksmithing 51 POKE HOLE – A small hole in the housing of some locks to permit depression of a retainer for removing one or more of the parts, usually the plug of a cylinder lock.

POLICE LOCK – A heavy-duty, double-bar lock which is mounted horizontally across the center of a door with its steel bars controlled from the outside by a rim cylinder and from the inside by a turn knob.

POST – The round section of a bit key between the shoulder and the tip, from which the bit projects. Also, one of any number of round projections of a lock case on which lock parts pivot or by which they are held in place. See curb post.

PREPARATORY KEY – Another name for a safe deposit box guard key.

PREPARATORY TUMBLER – Another name for a safe deposit lock guard tumbler.

PRESSED PADLOCK – A padlock with case parts pressed out of sheet metal and riveted together.

PRESSING – The process of shaping sheet metal by supplying enough force to push it into a forming die.

PRESSURE PAD – A raised area on the inside of the horn plate of a safe deposit lock which forms a bearing surface for the lever pack.

PRIVACY FUNCTION LOCK – A lockset in which either inside or outside knob works latchbolt; either inside turnpiece or inside knob works deadbolt.

PRIVACY KEY – Key symbol SKD. A change key set up as part of a master key system, but independent of all master keys in the system, to operate either a single lock or a group of locks keyed alike. Privacy keys are used for food storage rooms, narcotic cabinets, liquor cabinets, and so on.

PROFILER – Another name for the key guide on a key machine.

PROGRESSION – A mathematical series of bittings, chosen for master keying, in which each bitting is related by uniform arithmetical laws to every other bitting.

PROGRESSION FORMULA – The method used in master keyA Dictionary of Locksmithing ing to select the bittings which will be used in all the cylinders and keys in a master key system. The progression formula generates the individual change key combinations for the system.

PROGRESSION FORMULA CHART – A chart used to enumerate and select top master bittings and a progression sequence from among various possibilities for a master key system.

PROGRESSION SEQUENCE – The order in which bittings are selected from the columns of a progression formula chart to make up combinations for the various master keys and change keys in a master key system, using a change key progression chart.

PUNCH – A stamping tool. Also, a tool which comes in various shapes for cutting holes. See die.

PUNCH AND DIE SET – Two matched cutting tools which come in various shapes and sizes for cutting holes in sheet metal and other materials. See die.

PUSHBUTTON LOCK – A keyless lock on the combination lock principle with either combination slides or combination wheels which move to line up gates when the buttons are depressed in their correct sequence.

PUSH KEY – A key which pushes a lock’s tumblers to a vertical shear line, as in the case of a tubular ACE type lock, instead of lifting them to a horizontal shear line as in a standard tumbler lock.

PUSH TYPE PADLOCK – A padlock with a shackle released by pushing the key and the plug inward before turning.

QUAD MASTER KEY – Another name for a lever four master key.

QUADRUPLE BOLT LOCK – A lock with four bolts, usually deadbolts.

QUADRUPLE BOLT/QUADRUPLE THROW LOCK – A lock with four bolts, all fully extended by four full turns of its key.

QUADRUPLE THROW LOCK – A lock which requires four revolutions of its key to reach the full throw of its bolt.

RABBET – A woodworking joint, cut into abutting edges of a pair A Dictionary of Locksmithing 53 of doors to eliminate any open gap between the door. The edge of one door has a step which matches, and closes snugly into, a step in the edge of the other door.

RABBETED LOCK – A lock with a stepped front to match the rabbeted edge of the door.

RACK-DRIVE BOLT – A lock bolt driven by a key engaging teeth built into the bolt.

RADIUS ROOT – A key cut root which is curved instead of flat.

RAIL – One of the horizontal door members which join the stiles together; called the top rail, the bottom rail and the lock—or center— rail.

RAKING – A picking technique which entails rapid in and out, up and down movement of a wave-shaped pick to cause the tumblers of a lock to bounce to the shear line and catch there as turning pressure is applied to the plug. Also called jiggling.

RAPPING – A technique of opening a pin tumbler lock, when its key is missing, by striking its cylinder sharply with a blunt instrument so that both the top pins and the bottom pins are driven away from the shear line to allow the plug to turn. Rapping requires split second timing.

RASP – A coarse cutting tool similar to a file but with cutting points raised in the metal by the oblique stroke of a sharp punch, instead of with edges cut by a chisel as on a file. Rasps are used primarily on non-metallic materials.

RATTAIL FILE – A round file, usually one quarter of an inch or less in diameter, tapered toward the point.

READER – See lock reader. See also reading.

READING – A technique for determining the combination of key cuts of a disc tumbler lock by looking into the lock’s keyway to judge, either by sight or with a gage, the respective positions of the tumblers. See also decoder gage and lock reader.



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