T Glossary Terms - T Tail Piece The connecting link attached to the end of a rim cylinder which transmits the rotary motion of the key through the door, into the locking mechanism. Close Template A pattern or layout schedule of the exact positions and sizes that provides a door and/or frame manufacturer the necessary information with which to prepare for finish hardware, door lites and louvers. Close Threshold A strip fastened to the floor beneath a door. It serves as a stop, prevents heat loss, and provides a strike location for latching the bottom rod of a vertical rod exit device. Close Throw (of a Deadbolt or Latchbolt) The measurement from the tip of the bolt to the latch faceplate when the bolt is extended to its maximum projection. Close Throw-Off Latchbolt A cylindrical lock latchbolt which automatically unlocks the outside trim as the door closes, to prevent accidental lockout. Close Thumbpiece A small pivoted lever type actuator projecting outward from the door face which operates the exit device or lock. Close Thumbturn Device mounted on the inside of a door to throw the deadbolt. Close Toggle Mechanism designed to allow the user to lock or unlock the outside trim without a key. Close Transformer Converts one AC (Alternating current) voltage to another AC voltage. Close Transient Suppression Circuitry inside a solenoid or electro magnet to prevent large electrical spikes being generated back into power supplies, card readers, and other equipment when the device is turned off. Transients can damage or destroy these items. Close Transom Frame A door frame prepared for a panel or glazing material above the door opening that has a horizontal member also called a transom bar which separates the transom opening from the door. Can also be provided without a transom bar when a matching panel above the door is desired. Close Trim A knob, lever, pull or thumbpiece used on the outside of an exit device door to control access to an area. Close Trim Locking Trim Locking – Refers to the control of the lockable side of the door (usually the outside). Close Tubular Lock A type of bored lock or latch. Close Turn Piece A small lever or “T” shaped lock trim with a spindle attached which is used to operate the deadbolt on a mortise lock. Close Two Step Progression A progression using a two increment difference between bittings of a given position when pinning cylinders. Close