<<< B >>>

  • backplate A plate on the inside of a door through which the cylinder connecting screws and tailpiece is passed.
  • backset The horizontal distance from the edge of a door to the center of a lockset.
  • barrel bolt A rod-shaped bolt for fastening a door or the like, attached to one side of the door at the edge and sliding into a socket on the frame of the opening.
  • bathroom lock A lock with a springbolt operable on both sides by furniture, and a deadbolt operable from the inside only, usually by thumb turn.
  • bit key A key with a bit projecting from a solid cylindrical shaft. The bit has cuts to bypass the wards or operate levers in the correct lock.
  • bitting A cut, or series of cuts, on the bit or blade of a key.
  • blade The portion of the key that is inserted into the lock.
  • blank A key before any cuts have been made.
  • bolt The part of a lock or latch which provides the security by extending through the striking plate on the jam or secondary door.
  • bow The handle of the key.
  • burglar bars Steel bars use to provide extra security and fixes to window or door frames.


<<< C >>>

  • cabinet lock A generic term to include all locks of any type for use on pieces of furniture, such as cabinets, drawers, ETC.
  • cam A metal piece tongue fixed to the end of the plug of a lock cylinder to move the lock from open to close.
  • cam lock A lock that has an attached cam that serves as the locking point. Cam locks are often used on cabinets, file cabinets and drawers.
  • chamber The holes in cylinder housings that house top pins (drivers) and springs.
  • change key The key that operates one lock in a masterkeyed system.
  • Closed shackle padlock A padlock, the body is made to cover the minimum amount of shackle when locked. It offers improved security against theft, vandalism or harm
  • code A series of numbers or digits on a key or lock that specifies or references the particular cuts of the key to operate a lock.
  • collar The shoulder on the shank of a rim, mortice or bitted key, controlling the point at which the key comes to rest after being fully inserted into the lock. The collar is the datum point from which the key is measured.
  • combination lock A lock that requires a code to gain entry. An abbreviation of name for a keyless combination lock.
  • control key A key used to remove the core from an interchangeable core cylinder.
  • control shear line The shear line which allows operation of the control lug of an interchangeable core.
  • control sleeve The part of an interchangeable core retaining device which surrounds the plug.
  • cover The part of a lock or latch which covers the mechanism and is fixed, usually by screwing, to the case.
  • cross-bore A hole drilled into the face of a door where a bored or interconnected lockset is to be installed.
  • cuts A cut, or series of cuts, on the bit or blade of a key.
  • cylinder A cylinder with inner rotating plug which houses the pins, top pins (drivers), or disc tumblers and springs in the cylinder body.
  • cylinder housing The outer part of a lock cylinder which the core, tumblers and springs are held.
  • cylinder key A key for use with pin tumbler and wafer tumbler cylinder locks.
  • cylinder lock or latch Any lock or latch, the mechanism of which is contained in a cylinder.
  • cylindrical lockset A bored lockset whose latch or bolt locking mechanism is contained in the portion installed through the cross-bore.
  • cylinder rose (or ring) A shaped metal collar which surrounds the outer face of the cylinder of a lock.



<<< D >>>

  • deadbolt A lock bolt, usually rectangular, that has no spring action, and that becomes locked against end pressure when fully projected.
  • deadlatch A lock with a beveled latch bolt that can be automatically or manually locked against end pressure when projected.
  • deadlock A lock having only a deadbolt operable from one or both sides by key, and occasionally from outside only by key, inside by thumb turn.
  • deadlocking Pertaining to any feature which, when fully engaged, resists attempts to move the latch or bolt in the unlocking direction through direct pressure.
  • deadlocking latch A latchbolt with a deadlocking mechanism.
  • depth The depth of a cut is measured from the bottom of the blade up to the bottom of a cut. Depths are numbered starting with #0 (or sometimes #1) as the highest depth.
  • depth key A special key that enables a locksmith to cut blanks made from a particular lock according to a key code.
  • disc tumbler lock A cylinder lock having disc instead of pin tumblers.
  • door closer A device that attached to a door or gate that automatically closes after opening.
  • door viewer Optical device fitted through a door to enables someone to view what is on the other side of a door which out opening door.
  • double-bitted key One with cuts on each side of the key. Making the attempt to pick the lock more difficult.
  • double cylinder Pertaining to a lock with two keyed cylinders.
  • double cylinder deadlock A deadbolt lock whose bolt may be operated by a key from either side.
  • drill-pin (sometimes pin) A fixed stump or pin in a lock onto which the hollow shank of a pipe key fits when inserted to operate the lock.
  • drivers top pins. The pins in a lock that sit on top of the lower pins and rest against the springs.



<<< E >>>

  • Escutcheon A flat piece of metal for protection and often ornamentation, around a keyhole, door handle, or switch.



<<< F >>>

  • face plate The metal plate of the edge of a door covering the latch or bolt of a lock.
  • false notches or false gating 1.The notches in the bar of the levers and the bolt stump of some locks to improve the security against attempted picking.
  1. Cuts or notches which are put in some keys to give the appearance of greater intricacy although they serve no useful purpose.
  • flat steel key A key which is completely flat on both sides, usually used for warded or lever tumbler locks.
  • flush bolt A locking bolt which can be recessed flush into the edge or face of a door.
  • follower That part of the latchbolt or springbolt mechanism containing a square hole to admit the spindle (to which furniture is attached) which withdraws the springbolt when turned. It has one or two projections or horns which act on the bolt foot.
  • full mortise Pertaining to a method of installation in which only the face plate and trim is exposed. The lock case is installed in a pocket in the door or drawer.



<<< G >>>

  • grand master key When a series of locks is divided into two or more sub-suites the key which controls all the sub-suites (i.e. all the locks in the entire complex) is called the grand master key.
  • great grand master key One higher in degree than a grand master key. It is used only in very special arrangements of master keyed locks.
  • grooves Long narrow milled out areas along the sides of the blade to allow the blade to bypass the wards in the keyway.
  • guards A guard is a fixed part inside a lock to prevent false keys from turning, or to prevent an instrument from reaching the bolt or levers.
  • gunmetal Another term for bronze.



<<< H >>>

  • hasp A hinged metal strap designed to be passed over a staple and secured in place.
  • hasp and staple A fastening in two pieces for a door or box to be secured by a padlock. The hinged part is called the hasp and shuts over the staple. For real security it is essential to use a hasp and staple with concealed fixing.
  • heel & toe locking Describes a padlock which has locking dogs at both the heel and toe of the shackle.
  • heel (of a padlock shackle) The part of a padlock shackle which is retained in the case when in the unlocked position.
  • hinge bolts Fixed steel protrusions fitted into the rear edge or hinge side of doors, closing into holes cut into the door frame, to protect from forced attack on the hinge side of the door.
  • hold back stop A thumb slide on the case of a cylinder rim nightlatch or in the forend of a cylinder mortice lock used either to hold back or alternatively deadlock the main bolt.
  • hollow post key A key with a bit projecting from a hollow cylindrical shaft.
  • hook bolt A lock bolt shaped in the general outline of a hook. Normally used on sliding doors or where spreading of the frame and door is a possible attack.



<<< I >>>

  • impressioning: A means of fitting a key directly to a locked cylinder by manipulating a blank in the keyway and cutting the blank where the tumlbers have made marks.
  • interconnected lockset: A lockset whose trim provides a means of simultaneous retraction of two or more bolts which may also be operated independently.



<<< J >>>

  • jamb: The inside vertical face of a doorway.



<<< K >>>

  • keeper: A term sometimes used, particularly in the North, for a staple or striking plate.
  • key change: A term sometimes used instead of "differ". The change or differ of the key is generally indicated by number, and sometimes numbers and letters marked an the bow.
  • key code: A series of numbers or digits on a key or lock that specifies or references the particular cuts of the key to operate a lock.
  • key steps or key depths: Usually means the depths of the cuts on a key.
  • keyway: The part of the plug where you insert the key.
  • keyway grooves: Long narrow milled out areas along the sides of the blade to allow the blade to bypass the wards in the keyway.



<<< L >>>

  • latch: A mechanical device which automatically keeps a door closed until a deliberate action is used to retract it.
  • latchset: A latch complete with necessary furniture including a spindle, ready for fixing to the door.
  • lever handle: A lock handle that is angled to make opening the door easier to do.
  • lever lock: Lock with levers that are each lifted to the correct level by a bit key or flat metal key to enable the lock to operate.
  • lever mechanism: A lock mechanism having, as its principle feature, one or more levers.
  • lock: Any device which prevents access or use by requiring special knowledge or equipment.
  • lockable bolt: A bolt that can be locked in position by the use of a removable key.
  • locking latch: A latch with a bevelled springbolt which is capable of being lcked or secured, usually by key.
  • lockset: A lock made for securing a door.
  • locksmith: A person with the knowledge and ability to select, install, service and bypass all the components of an electrical or mechanical lock.
  • long shackle: A padlock shackle with a longer clearance than the standard shackle.
  • lower pins: The pins of a lock that contact the cuts on the key. Also called bottom pins.
  • lubrication: Graphite is the conventional lubricant for Lock Cylinders. On no account should oil be used to lubricate pin-tumbler cylinders.



<<< M >>>

  • master key A key which will open every lock in the master keyed suite.
  • master keyed (locks or latches) A lock or latch capable of being operated also by a master key as well as its own change or servant key.
  • master pins Small pins sometimes called wafers to build up chamber pin loading in pin tumbler master keyed cylinders.
  • mechanism (of locks or latches) The arrangement of the component parts and the manner in which they perform to achieve the required security and differing when operated by its key.
  • mortise A hole cut into the thickness of one edge of a door to receive a mortice lock or latch.
  • mortise lock (or latch) A lock or latch which is mortised to let into the thickness of the door from the meeting edge and held in position by screws through the faceplate.



<<< N >>>

  • narrow case lock or latch A rim lock or latch, the case of which is made specially narrow, usually less than three inches wide, for fixing to the narrow stile of a panelled or flush door.
  • nightlatch A rim or mortise latch with a beveled springbolt which secures the door when the door is closed, but can be withdrawn by key from outside and by knob or lever handle from inside.



<<< O >>>



<<< P >>>

  • pins Usually the lower of each pair of tumblers in the pin tumbler cylinder mechanism. The upper are known as drivers.
  • pin stack The combination of a lower pin sitting beneath an upper pin. In master keyed locks, additional master pins may be located between the lower and upper pins.
  • pin tumbler mechanism The mechanism incorporated in the cylinder or body of a cylinder pin tumbler lock, latch or padlock.
  • plug The part of the lock that you put the key into, and which turns to operate the lock.
  • pre-assembled lockset A lock designed to be installed into a cutout in the edge of a door. The lock body and most or all of its trim need no further assembly other than securing it to the door.



<<< R >>>

  • relocker A locking mechanism independent of any key operations, mounted remotely within a safe mechanism so as to relock the boltwork under certain forced attacks.
  • rim cylinder This relates to a pack which usually comprises the cylinder with plug, rose, connecting bar, two connecting screws and two keys.
  • rim lock A lock or latch typically mounted on the surface of a door or drawer.
  • roller bolt A springbolt made in the form of a roller, instead of being bevelled. It is recommended far more silent and easier closing of a door.
  • rose A metal ring which covers where a cylinder or knob goes through the surface of the door.



<<< S >>>

  • safe lock A general term for the many types of locks for safes.
  • set screw One which tightens or fastens another part after assembly or adjustment.
  • shackle The part of a padlock which passes through an opening in an object or fits around an object and is ultimately locked into the case.
  • shear line The dividing line between the plug and the shell (the height to which the tops of the lower pins must be raised to open the lock).
  • shell The outer part of the lock that surrounds the plug. Also known as cylinder housing.
  • shoulder(or bow stop) The edge of the key that touches the face of the lock to define how far the key is inserted into the lock.
  • side bar This is in addition to the existing pin or disc mechanism, and is a bar usually along the length of the mechanism and does not allow rotation until the mechanism until it is correctly lifted and can be directly controlled by the key.
  • skeleton key Any non-cylinder key whose bit, blade, and/or post is cut away enough to allow it to enter and turn in locks with different ward arrangements. There is no universal skeleton key. Skeleton keys cannot be made for lever and cylinder lock mechanisms.
  • spacer A distance piece of thin metal placed between the levers of some locks.
  • spacing The term used to describe the horizontal distances across a key blade or bit.
  • spindle That part of the door lock, usually of square section, which passes through the latch cam hole and is fitted to the knob(s) or lever handle(s) to operate the springbolt.
  • spool pin A pin that has a groove cut around it's periphery. The groove is intended to catch at the shear line as a deterrent to picking.
  • spring shackle padlock A padlock in which the shackle springs open when unlocked.
  • springbolt Sometimes called the latchbolt. The part of a locking knob which extends from the edge of the door to secure the door. Has a beveled face to allow the closing of the door without turning the lock.
  • springlatch A latch with one beveled springbolt which locks the door when shut. It is opened by key from the outside and by knob from inside.
  • stile A vertical member of a door.
  • strike plate The metal plate of the door jam or secondary door that the lock extends through to secure the door.
  • sub grand master key A key which will operate all locks in its own main group or (sub-grand suite) of a grand master keyed system.
  • sub master key A key which will operate all locks in its own smaller group (or sub-suite) of a grand master keyed system.



<<< T >>>

  • throw The distance a deadbolt moves under the action of its key.
  • thumb turn A small knob, on the inside of a mortise lock, which is gripped between thumb and finger to operate the deadbolt.
  • till lock A drawer lock, or more correctly a cabinet lock, having a springbolt that shoots upwards and a vertical keyhole. It is self-closing and is unlocked by key.
  • time lock A clockwork or electric timing device which allows the opening of a door on safes only during the preset times.
  • tip The very end of part of the key that you stick into the lock first.
  • toe (of a shackle) That part of the shackle which may be removed from the padlock body.


Please Note:


Your Identification may be requested and recorded prior to any work.