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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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REBATED LOCK – Another name for a rabbeted lock.

RECOMBINATE – To change the combination of a lock.

A Dictionary of Locksmithing REGISTER GROOVE – The milled groove closest to the bottom edge of the blade of a paracentric key and parallel to the length of the blade.

REGULAR BEVEL – See lock bevel.

REKEYING – The changing of the combination of a keyed lock.

Rekeying requires changing both the lock’s tumblers and the key cuts of its key.

RELOCKER – A device on some safes which locks the safe’s main bolt when a burglar has tampered with the combination lock. Also called a relocking device, it is independent of the combination lock.

See also relocking trigger.

RELOCKING DEVICE – Another name for a relocker on safes.

RELOCKING TRIGGER – A part of a combination lock which secures the lock’s bolt if and when the cover at the back of the lock is punched off. See also relocker.

REMOVABLE CORE – The separable unit of certain cylinders and padlocks which contains the plug, the tumblers and the upper chambers of the lock, and which can be taken out of the lock for rekeying and repair. See also interchangeable core, interchangeable core cylinder and removable core cylinder.

REMOVABLE CORE CYLINDER – A cylinder with a removable core. Although an interchangeable core cylinder, with its unique control key, is sometimes considered one type of removable core cylinder, the term is usually limited to those cylinders with removable cores which are not operated by control keys. See also interchangeable core, interchangeable core cylinder and removable core.

REMOVABLE DIAL – A combination lock dial which can be removed from its spindle.

REMOVAL KEY – A key used to remove the active core of interchangeable core cylinders. Also called the control key.

RENTER’S KEY – The key given to the renter of a safe deposit box. A renter’s key will not open a safe deposit box until the guard key has first prepared the lock mechanism for opening.

A Dictionary of Locksmithing 55 RESTRICTED KEY BLANK – A key blank available from the manufacturer only, either with the purchase of a lock with a restricted keyway to match or with proof of ownership of such a lock.

RESTRICTED KEYWAY – A keyway which a manufacturer supplies on his locks only on special request, as an added security feature.

RETAINER – See back plate, plug retainer, retaining washer, spring retainer.

RETAINING PLATE – Another name for a back plate.

RETAINING RING – A plug retainer.

RETAINING WASHER – A washer which keeps the wheel pack on its post in a combination lock. There are three basic types of retaining washers: horseshoe, split ring and spirolox.

RETRACTOR – That part of a knobset which engages the latchbolt and draws it into the door when the knob is turned.

REVERSE BEVEL – See lock bevel.

REVERSIBLE BOLT – A latchbolt which can be turned so that it will work either on a left-hand door or on a right-hand door. See handing of doors.

REVERSIBLE LOCK – A lock with a reversible latchbolt which can be changed from left-hand to right-hand, usually by reversing the bolt. See handing of doors.

RIGHT HAND LOCK – A lock used with a right-hand door. See handing of doors.

RIM CYLINDER – A lock cylinder mounted through a door hole and fixed from the inside by means of screws and a retaining plate, called the back plate. It operates its lock, which is mounted on the inside surface of the door, by a connecting bar.

RIM LATCH – A latch attached to the surface of a door. See also night latch.

RIM LOCK – A lock secured to the surface of a door instead of being mortised into the edge.

RIM NIGHT LATCH – An auxiliary lock installed on the inside A Dictionary of Locksmithing surface of a door. The bolt of the night latch is retracted on the inside by a thumb turn and on the outside by a key which works a pin tumbler cylinder mounted through a hole in the door. Also called simply a night latch.

RING PLIERS – Special pliers for spreading or compressing the sides of the split rings which fit on various shafts and plugs to hold parts in place.

ROCKER – A straight lock part which pivots from a hole in the center to transmit or change the direction of the motion of some other part.

ROLLBACK – A lock part which transmits motion from the knob or key to the retractor.

ROLLER BOLT – A bolt with a roller mounted vertically on the tip, used on occasion in place of a beveled bolt to reduce friction and to reduce the danger of injury from the sharp edges of a beveled bolt.

ROOT – The flat surface of the base of a key cut, parallel to the length of the blade, on which a lock tumbler rests.

ROOT DEPTH – The distance between the bottom, called the root, of a key cut and the bottom edge of the key blade.

ROSE – A round lock fitting, attached to the surface of a door, which supports the knob and through which the knob shank, and in some cases the spindle, passes. Also, another name sometimes given to a cylinder ring.

ROTARY DISC TUMBLER – A special type of round disc tumbler with a stem which lines up with the stems of other rotary disc tumblers when turned by a rectangular key cut with an angled root acting through its center. It is used exclusively in locks made by Abloy, Inc.





ROTARY FILE CUTTER – The most common type of cutting wheel for key machines. The rotary file cutter has serrations like a file and one beveled edge. See also milling cutter, side milling slotter and slotting cutter.

ROUNDED FRONT – A face plate curved to match the rounded A Dictionary of Locksmithing 57 edge of some doors.

RUNNER – A sliding lock part which transmits the motion of the hub to the bolt in some spring locks and night latches.

SAFE – A box or chest, universally made of metal and sometimes built into a wall or vault, for holding money and other valuables, often fire and burglar proof and usually equipped with a combination lock.

SAFE DEPOSIT BOX – One of a group of attached metal boxes, usually inside a bank vault, secured individually with a precision lever tumbler lock, called a safe deposit lock, and rented to customers for storing valuable papers and small objects.

SAFE DEPOSIT LOCK – A high precision lever tumbler lock with either one or two keyway horns, with either fixed tumblers or changeable tumblers, and used to secure an individual safe deposit box.

SAFE DEPOSIT LOCK PULLER – A tool which forcibly removes the door of a safe deposit box, using the mechanical advantage of a screw thread, when other means of entry are impractical and after the locksmith has tried to open the door by pulling only the nose of the lock.

SAFE LOCK – A lock, usually a combination lock, built into the door of a safe to prevent unauthorized access to the safe’s contents.

SAFETY DEPOSIT LOCK – An incorrect name sometimes given to a safe deposit lock.

SASH – The movable part of a window.

SASH WARD – A type of ward used in two side rim and mortise locks which, machined usually from brass, is fixed in matching pairs to both sides of the lock case around the keyholes.

SCALP – A second face plate on a mortise lockset to conceal the set screws which hold the threaded cylinder in place.

SCANDINAVIAN PADLOCK – The common padlock which has a U-shaped, spring-loaded shackle, instead of a pivoted shackle.

A Dictionary of Locksmithing SCOTCH SPRING – A long, tapered spring used in old locks in tandem with a pivoted arm to help retract the bolt.

SCREW CHANGE WHEEL – A type of combination lock hand change wheel for which the combination is changed by moving the screw which serves as a drive pin from one threaded hole in the wheel to another. Also called a fixed pin hand change wheel.

SCREW EXTRACTOR – A special tapered drill bit with longuted, left-hand threads for removing broken screws. Also called EZYOUT, after a trade name.

SCREWLESS KNOB – A knob fastened to a spindle without screws. SCRIBER - A sharp, pointed tool for marking lines on materials to be cut or measured.

SECOND GENERATION DUPLICATE – A duplicate key made by copying another duplicate key which was made from an original key.

SECTIONAL KEYWAY – One of a group of keyways, each with individual but interrelated key sections, used for part of a master key system, such as the floor of a building. See key section series.

SECTIONAL MASTER KEY – A master key used in one sectional keyway only as part of a master key system. See key section series.

SECTIONAL MASTER KEYING – A method of master keying by using the same combinations with a number of different key sections chosen in such a way that higher level master keys will fit into the keyways of lower level master keys and their change keys, but not vice versa.

SECTION MASTER KEY – Another name for a level five master key.

SECONDARY LOCK – Any lock, usually a deadbolt lock, added to a door to supplement an existing lock. Also called an auxiliary lock.

SECURITY – The ability of an enclosed area and the lock which guards it to withstand unauthorized entry.

SEGMENT BOLT – A curved springbolt which pivots instead of A Dictionary of Locksmithing 59 sliding to cut down on friction when it hits the strike.

SEGMENT MASTER KEY – Another name for a level three master key.

SELECTIVE MASTER KEY – A special master key set to operate any lock in a master key system without cross-keying, such as an engineer’s key. Usually there are no more than two selective master keys in a system. See also unassociated master keys.

SELVEDGE – A name used in England for the face plate.

SEMI-MORTISE LOCK – A lock which is cut into a door or drawer so that it is flush with the surface but not entirely encircled by the door or drawer as it would be if fully mortised.

SEPARATOR DISC – See spacer.

SERIES WAFER – One of the three types of wafer tumblers of a popular cylindrical lock made by the Schlage Lock Co., designed so that, when there is no key in the keyway, the series wafer stem, along with the stem of the master wafer, sticks out of the plug to prevent the plug from turning. Each such lock normally uses three series wafers, but one or two of them can be removed for masterkeying.

See also combination wafer, master wafer and wafer tumbler.

SERVANT KEY – The British name for a change key in a master key system.

SET SCREW – A screw used to hold part of a mechanism in place.

For example, a set screw, with access from the face plate, holds the cylinder securely in a mortise lock case.

SET-UP KEY – Another name for a safe deposit box neutral key.

SHACKLE – The hinged or sliding link of a padlock, usually Ushaped or curved and made of hardened steel.

SHACKLE CLEARANCE – The distance between the top of a padlock case and the highest inside point on the shackle when closed.

SHACKLE RETAINER – A specially cut lamination of a laminated padlock which keeps the heel of the shackle in place. Also, a pin which holds the shackle heel in place in several types of padlocks.

A Dictionary of Locksmithing SHACKLE SPRING – The compression coil spring positioned under the heel of a padlock shackle to push the free end of the shackle out of the padlock when the locking dog retracts.

SHANK – The section of a bit key between the bow and the shoulder. Also, the projecting stem of a knob which holds the end of the spindle.

SHAVED BLADE – A key blade with a curved bottom edge to follow the contour of the cylinder plug circumference. Most original key blanks have shaved blades. See also unshaved blade.

SHEAR LINE – The space of several thousandths of an inch between a cylinder plug and its cylinder housing. The shear line is completely unblocked only when the ends of the tumblers line up with the circumference of the plug.

SHELL – Another name for the housing of a lock.

SHIELD RING – Another name for a burglar-proof guard ring.

SHIM – A thin strip of metal, usually less than five thousandths of an inch thick and one quarter of an inch wide, used in shimming open a pin tumbler lock.

SHIMMING – A technique of opening a pin tumbler cylinder by inserting a shim from the rear across the shear line while withdrawing a key blank from the keyway so that the shim can slip between the bottom pins and the top pins.

SHIM WASHERS – Washers used in locks to compensate for manufacturing tolerances. Shim washers are placed, for example, on the post of a lever tumbler lock to space the tumblers. They are also used to space the wheels in combination locks.

SHOOT – The throw of a springbolt; that is, the distance it travels.

SHOULDER – A projection between the bow and the blade of a key which limits the travel of the key into the keyway and from which the positions of the key cuts on the blade are indexed. See also key stop.

SHOULDER GUIDE – That part on some key machines, shaped like a two-pronged fork, which permits the operator to set with ease A Dictionary of Locksmithing 61 the proper spacing between the shoulders of the sample key and the key blank as they are clamped in the key machine vises. The shoulder guide is mounted on a pivot so it can be pushed out of the way during the cutting of the key. Also called a gage fork.

SHUT-OUT – A setting on hotel function locks, operated by a thumbturn or push-button from the inside or by a display room key or emergency key from the outside, which renders the guest room key and all other master keys except the emergency key inoperative.

SHUT-OUT KEY – A key to permit the management of a hotel to lock a door against the use of all other keys except an emergency key.

SHUTTER – The spring-loaded part of a dust cap on an automobile door or trunk lock which actually covers the keyhole and which is pushed out of the way when the key is inserted. See also keyway shutter.

SIDEBAR – A metal bar which protrudes from the side of certain cylinder plugs and crosses the shear line when the correct key is not in use to prevent the plug from turning, performing the same function as the tumblers of a standard cylinder when they cross the shear line.



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