rabbeted door
n. a door having and edge contoured with an offset creating two surfaces which form an overlap at the abutting edge
rabbeted lock
n. a lock with a face or front which is specially formed to use in a rabbeted door
radio frequency identification
n. an identification technology using short range radio frequency transmission
radiused blade bottom
n. the bottom of a key blade which has been radiused to conform to the curvature of the cylinder plug it is designed to enter
n. the horizontal construction member located on the top and bottom of a door
rake (rake & hang)
n. a picking technique that attempts to use quick withdrawal of the pick to set the tumblers
random master keying
n. any undesirable process used to master key which uses unrelated keys to create a system
randomized order
n. 1. an arrangement of cut depths in a KBA without numerical order, 2. an arrangement or list, such as a bitting list, in which the information is sorted in no easily discernible pattern
v. 1. to unlock a plug from its shell by striking sharp blows to the spring side of the cylinder while applying tension to the plug 2. to unlock a padlock shackle from its case by striking sharp blows to the sides in order to disengage the locking dogs
ratchet lock
n. any lock which incorporates a ratchet device allowing locking in more than one position
adj. of or pertaining to a product's compliance with one or more recognized standards such as UL.
v. to decode a lock combination visually without disassembly of the lock or cylinder
read key
n. a key which allows access to the sales and/or customer data on certain types of cash control equipment (e.g., cash register)
n. a device used in an access control system to interrogate an electronic, magnetic or optical type of credential
rear drive
adj. of or pertaining to a combination lock with the wheel pack located between the dial and the drive cam
v. to change the combination of a lock, cylinder or key
record safe
n. a safe whose primary purpose is to preserve paper documents against fire
v. to rekey by installing a different core
redundant button
n. a secondary release switch for an egress device to allow unlocking in case of a malfunction of the primary release switch
register groove
n. the reference point on the key blade from which some manufacturers index the bitting depths
register number
n. 1. a reference number, typically assigned by the lock manufacturer to an entire master key system 2. a blind code assigned by some lock manufacturers to higher level keys in a master key system
v. to change the existing combination of a cylinder or lock
relock trigger
n. the part of a safe relocking device which causes the mechanism to activate
relocking device
n. any device intended to prevent normal opening of a safe as a result of an attack, two types are typically used, internal and external 
remote release
n. a mechanism for permitting the unlocking of any lock device at a distance from the device
removable core
n. a key removable core which can only be installed in one type of cylinder housing; e.g., rim cylinder or mortise cylinder or key-in-knob lock
removable cylinder
n. a cylinder which can be removed from a locking device by a key and/or tool
removable dial
n. a combination lock actuator that may be taken from the lock when not in use
removable shackle
adj. referring to a type of padlock which is unlocked by removing the shackle from the case
removal key
n. the part of a two-piece key which is used to remove its counterpart from a keyway, see also "control key" #1 & #3, see also "construction breakout key"
renter's key
n. a key which must be used together with a guard key, prep key or electronic release to unlock a safe deposit lock. It is usually different for every unit within an installation.
v. to replace pin tumblers, with or without changing the existing combination
reset code
n. in an electronic lock, a factory-set or user-set code or combination that will restore all factory default settings except the current reset code and the audit trail
reset key
n. 1. a key used to set some types of cylinders to a new combination. Many of these cylinders require the additional use of tools and/or the new operating key to establish the new combination. 2. a key which allows the tabulations on various types of cash control equipment (e.g., cash registers) to be cleared from the records of the equipment
resettable tumbler
n. a tumbler which can have its reference position altered by reorientation within the cylinder without disassembly
resistor pellet
n. the encapsulated resistor with exposed contacts installed in a key, such as that for VATS
n. a device designed with a shackle that restricts the movement or actions of a person, such as handcuffs
adj. of or pertaining to a keyway and corresponding key blank whose sale and/or distribution is limited by the lock manufacturer in order to reduce unauthorized key proliferation
n. a component which is clipped, staked, or driven in place to maintain the working relationship of other components
retainer pin
n. 1. a component seated on a spring, in the end of a plug, that interacts with a retainer cap to keep it in place. 2. Any non-threaded rod that maintains the relationship of two or more different parts.
retrofit lever
n. a lever handle designed to replace the knob of a lockset
n. 1. the extension of a cam which bends back towards the mounting surface and the measurement of the remaining distance from the mounting surface to the end of the cam, 2. the distance from a door face to the tip end of a lever handle
n. the distance measured from the trim surface of the jamb to the leading face of the door on the stop side when closed
reverse bevel
adj. pertaining to the bevel of a door which swings towards the outside
reverse keyway
n. a keyway shape that is a mirror image of another
reverse strike
n. a strike used for rim mounted hardware used on reverse bevel doors
adj. pertaining to hardware that is manufactured in a way, which allows field assembly or adjustment to accommodate installation on doors with different orientations
reversible key
n. a usually symmetrical key which may be inserted either way up to operate a lock
abb. Radio Frequency
abb. radio frequency identification
abb. right-hand
abb. (right hand reverse bevel)
abb. right hand vertical down
abb. right hand vertical up
right hand (man door)
adj. pertaining to an inward swinging door with hinges on the right side, using the outside of the door as reference
right hand reverse bevel (door)
adj. pertaining to a right handed door which swings outward
right track
n. the farthest right bitting surface of a sidewinder key, as the wider surface of the blade is viewed with the bow of the key nearest the observer
rim cylinder
n. a cylinder typically used with surface applied locks and attached with a back plate and machine screws. It has a tailpiece to actuate the lock mechanism
rim exit device
n. an exit device mounted on the door surface
rim lock
n. a lock or latch typically mounted on the surface of a door or drawer
rim vertical rod exit device
n. a vertical rod exit device mounted on the door surface
ring key
n. a key attached to a ring to be worn on the finger
abb. The title "Registered Locksmith" as awarded by ALOA
abb. relocking device
abb. relock trigger
abb. row master key
root depth
n. the dimension from the bottom of a cut on a key to the bottom of the blade
n. a usually circular escutcheon
rotary file cutter
n. a key machine cutter with very fine teeth which are formed by stamping, such as a file
rotary disc tumbler
n. a circular tumbler with one or more gates. Rotation of the proper key aligns the tumbler gates at a sidebar, fence or shackle slot.
rotating constant
n. one or more cut(s) in a key of any level which remain constant throughout all levels and are identical to the top master key cuts in their corresponding positions. The positions where the top master key cuts are held constant may be moved, always in a logical sequence
rotating constant method
n. a method used to progress key bittings in a master key system, wherein at least one cut in each key is identical to the corresponding cut in the top master key. The identical cut(s) is moved to different locations in a logical sequence until each possible planned position has been used.
round back
adj. pertaining to a rim cabinet lock whose mounting flanges and case form the general shape of a circle when viewed from the back
round cornered latch
adj. of or pertaining to a latch mounting plate with radiused corners
rounded front
n. a lock front or face plate that is radiused to match the edge of the door
row master key
n. the one-pin master key for all combinations listed on the same line across a page in the standard progression format
std. an Electronics Industry Association (EIA) standard for serial multipoint communications commonly used in online access control systems for distances up to 4000 feet
abb. the title "Registered Safe Technician" as awarded by NSO


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Appendix

This listing of the Locksmith Dictionary is courtesy of