Glossary
T-Handle-
(n.) A T-shaped handle assembly which may be lockable.
T-Strike-
(n.) A strike whose lip spans the middle portion (but not the full height) of the strike.
Tactile-
(adj.) Of or pertaining to a knob, lever or other device to open a door, which conveys a special sense of touch; typically used as a warning to the visually impaired of danger on the other side of the door.
Tailpiece-
(n.) An actuator attached to the rear of the cylinder, parallel to the plug, typically used on rim, key-in-knob or special application cylinders.
Talon-
(n.) The part of a lever lock bolt that is relieved to allow the key to enter and move the bolt.
Tamper Resistant Fastener-
(n.) Any one of several screws or nuts which have a specialized head, requiring a special-access tool for removal.
Tamper Switch-
(n.) A sensor that signals when someone attempts to access the mechanism of a security device.
TCP-
(abb.) Transmission Control Protocol
TCP/IP-
(n.) The system networks use to communicate with one another.
Telescoping Bolt-
(n.) The bolt of a locking device which extends and retracts by successive overlapping sections.
Telescoping Column-
(n.) A steering column adjustable for length.
Template-
(n.) A pattern used to mark cutout locations for hardware installation.
Template Hinge-
(n.) A hinge with dimensions, hole locations and tolerances which conform to ANSI standard A156.7
Tension Wrench-
(n.) A tool used to apply torque to a lock bolt or cylinder plug while attempting picking.
Theoretical Key Changes-
(n. pl.) The total possible number of different combinations available for a specific cylinder or lock mechanism.
Thermal Lance-
(n.) An instrument, used for cutting with a pure oxygen feed, that uses itself and the material being cut as fuel.
Thermal Relocker-
(n.) A relocking device which is activated by heat.
Threaded Rose-
(n.) A rose with an internally threaded ferrule.
Three Column Progression-
(n.) A process wherein key bittings are obtained by using the cut possibilities in three columns of the key bitting array.
Three Pin Master Key-
(n.) A master key for all combinations obtained by progressing three bitting positions.
Three Point Latch-
(n.) A self-latching device designed to latch a door at the top, bottom and edge.
Throat Cut-
(n.) The cut made into a key to bypass a throat ward.
Throat Ward-
(n.) An obstruction formed in a lock's case or horn at the point of key entry, which prevents key rotation.
Throw-
(n.) The distance a bolt or latch projects from the faceplate or case of a lock in the extended position.
Throw Member-
(n.) An intermediate actuator which engages the rear of the plug to transfer motion to a cam, tailpiece or other actuator.
Thumb Cuffs-
(n.) Restraints designed to lock on the thumbs.
Thumb Index-
(n.) A projection of metal on a key bow which serves as a tactile means of orienting a non reversible key for correct lock insertion.
Thumb Latch-
(n.) A lock with a thumbpiece to actuate the latch.
Thumb Turn-
(n.) A actuator which can be turned by thumb and forefinger.
Thumb Turn Cylinder-
(n.) A cylinder with a turn knob rather than a keyway and tumbler mechanism.
Thumbpiece-
(n.) A generally flat, projecting latch actuator found above a grip handle and depressed by the thumb.
Tilt Column-
(n.) A steering column design which permits vertical adjustment of the steering wheel.
Time Delay-
(n. and adj.) A feature which prevents operation until a set amount of time has elapsed. Activation normally begins when access, egress or other unlocking is desired.
Time Delay Lock-
(n.) A lock that has a mechanism for preventing unlocking until a specific amount of time has passed.
Time Lock-
(n.) A secondary device which prevents movement of a bolt or boltworks until a set amount of time has elapsed. The device is normally set or activated at the time of locking.
Timing-
(n.) The engagement or positioning of an assembly of internal parts so as to produce the desired sequence of engagement during operation.
Tip-
(n.) The portion of the key which enters the keyway first.
Tip Stop-
(n.) A type of stop located at or near the tip of the key.
Tips & Stems-
(n.) A key bow and shank that uses a detachable end with a bit(s) on it.
TL-15-
(n.) A U.L. rating given to a container whose door has been tested against forcible entry, with common hand tools, for a period of 15 man minutes.
TL-30-
(n.) A U.L. rating given to a container whose door has been tested against forcible entry, with common hand tools and/or abrasive cutting wheels and power saws, for a period of 30 man minutes.
TMK-
(abb.) Top Master Key
Toe (of a Shackle)-
(n.) That part of the shackle, which may be removed from the padlock body.
Toggle-
(n.) A pivoting one-piece stop works activator.
Token-
(n.) A self-contained electronic key.
Tolerance-
(n.) The deviation allowed from a given dimension.
Tone Dialer-
(n.) A telephone communication device, normally activated by an alarm, that uses a series of tones to dial a predetermined number.
Top Jamb Mount-
(n.) Surface application of a door closer body directly to the header.
Top Master Key-
(n.) The highest level master key in a master key system.
Top of Blade-
(n.) The bitted edge of a single bitted key.
Top Pin-
(n.) Usually a cylindrical shaped tumbler, usually flat on both ends and installed directly under the spring in the pin stack.
Total Position Progression-
(n.) A process used to obtain key bittings in a master key system wherein bittings of change keys differ from those of the top master key in all bitting positions.
Touch Bar-
(n.) A type of exit device actuator which typically does not pivot and retracts the bolt with a minimum of pressure.
Touch Pad-
(n.) 1. An exit device actuator with a paddle shape.
(n.) 2. A remote door opener activator, typically electric or electronic, which facilitates handicap access.
Track-
(n.) The bitting surface of a sidewinder key.
Trailing Face-
(n.) The door face farthest from the strike side of the jamb when the door is open.
Transom Catch-
(n.) A surface mounted latch, typically having an actuator operated by a long pole or an attached pull chain.
Tri Spoke Handle-
(n.) A safe handle that has 3 extensions off the main hub.
Tri-Bolt-
(adj.) Referring to a three point locking system usually found on round door safes.
Trick Lock-
(n.) A lock which requires successful operation of one or more moving panels, concealed buttons, etc., often in addition to normal operation by key and/or combination.
Trim-
(n.) Exposed components of a lockset or latchset, which allow operation, enhance appearance or provide protection.
Trim Panel-
(n.) The decorative and functional assembly, which covers the inside surface of a vehicle, door.
Triplex Spindle-
(n.) A spindle with three wedge shaped bars which spread to grip the inside of the knob shank when the knob set screw is tightened.
TRTL-15x6-
(n.) A U.L. rating given to a container when it has been tested against forcible entry, on all six sides, with common hand tools and/or abrasive cutting wheels, power saws, and oxy-fuel gas cutting or welding torch for a period of 15 man minutes.
TRTL-30-
(n.) A U.L. rating given to a container where the door has been tested against forcible entry with common hand tools and/or abrasive cutting wheels, power saws, and oxy-fuel gas cutting or welding torch for a period of 30 man minutes.
TRTL-30x6-
(n.) A U.L. rating given to a container when it has been tested against forcible entry, on all six sides, with common hand tools and/or abrasive cutting wheels, power saws, and oxy-fuel gas cutting or welding torch for a period of 30 man minutes.
TRTL-60-
(n.) A U.L. rating given to a container where the door has been tested against forcible entry with common hand tools and/or abrasive cutting wheels, power saws, and oxy-fuel gas cutting or welding torch for a period of 60 man minutes.
Trunk Lock-
(n.) 1. A hinged strap with a staple or a lock at the end that mates with a receptacle in the trunk.
(n.) 2. A lock designed to secure the trunk of an automobile.
Trunnion-
(n.) The part of a lever lock that accepts the key and stabilizes it, typically a single piece or an assembly consisting of some combination of a nose, guide and foot.
Try-Out Key-
(n.) A manipulation key which is usually part of a set, used for a specific series, keyway, and/or brand of lock.
TTL-
(abb.) 1. Transistor Transistor Logic
(abb.) 2. Time To Live
Tube-
(n.) A hollow structure attached to the outside of a combination lock for enclosing the spindle between the lock case and the dial.
Tubular Key-
(n.) A key with a tubular blade. The key cuts are made into the end of the blade, around its circumference.
Tubular Key Cylinder-
(n.) A cylinder whose tumblers are arranged in a circle and which is operated by a tubular key.
Tubular Lockset-
(n.) a bored lockset whose latch or bolt locking mechanism is contained in the component installed into the edge bore.
Tubular Pick-
(n.) A pick designed to operate a tubular key lock.
Tumbler-
(n.) A movable obstruction of varying size and configuration in a lock or cylinder which makes direct contact with the key or another tumbler and prevents an incorrect key or torque device from activating the lock or other mechanism.
Tumbler Lock-
(n.) 1. Tumblers are small objects, usually made of metal that move within a block cylinder in ways that obstruct a lock’s operation until an authorized key or combination moves them into alignment. Provides more security that a ward lock. Different type of tumbler locks are: Lever Tumbler Locks, Disc Tumbler Locks and Pin Tumbler Locks.
Source: Phillips, Bill; The Complete Book of Locks and Locksmithing, fifth edition, McGraw Hill, 2001
(n.) 2. The part in a lock that releases the bolt when moved by a key.
Source: Dictionary.com
Tumbler Nest-
(n.) A position within a lock designed to accept a tumbler pack, it typically includes a tumbler post and a spring rest.
Tumbler Pack-
(n.) A complete set of lever tumblers for a given lock.
Tumbler Post-
(n.) A rod mounted in a lever lock, upon which the pivoting ends of the tumblers are in turn mounted.
Tumbler Separator-
(n.) A thin spacer placed between lever tumblers to reduce friction.
Tumbler Spring-
(n.) Any spring which acts directly on a tumbler.
Turn-
(n.) A lock, latch or exit device part which is contacted to achieve the normal operation. It may be a knob, lever or thumb turn.
Turn Disk-
(n.) A disk shaped component with a cam actuated by a thumb turn, normally used in a mortise lock.
Twisting Tumbler-
(n.) A pin tumbler which must rotate to a specific position to allow plug rotation.
Two Column Progression-
(n.) A process wherein key bittings are obtained by using the cut possibilities in two columns of the key bitting array.
Two Pin Master Key-
(n.) A master key for all combinations obtained by progressing two bitting positions.
Two Point Lock-
(n.) A lock with two bolts which are thrown and withdrawn simultaneously, often in more than one direction.
Two-Step Progression-
(n.) A progression using a two increment difference between bittings of a given position.
TXTL-60-
(n.) A U.L. rating given to a container where the door has been tested against forcible entry with common hand tools and/or abrasive cutting wheels, power saws, and oxy-fuel gas cutting or welding torch and may further include nitroglycerin or other high explosives for a period of 60 man minutes. The total quantity of explosives employed may not exceed 8 ounces. Not more than 4 ounces is to be used in a single charge.
Type 1-
(n.) A UL rating given to an electronic combination lock able to withstand 20 man-hours of expert manipulation as well as other specifications as listed in UL 2058.
Type 1F-
(n.) A UL rating given to an electronic combination lock able to withstand 20 man-hours of expert manipulation as well as other specifications as listed in UL 2058. The lock also meets U.S. Federal Specifications FF-L-2740.
Type 2-
(n.) A UL rating given to an electronic combination lock able to withstand specifications as listed in UL 2058.
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