Locksmith Glossary - T


Source: Lock Industry Standards and Training (LIST) Council

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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