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 G L O S S A R Y O F T E R M S 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 All T Handle A cross handle for actuating the bolt of a lock and used in place of a knob.
T Hinge A surface hinge with the short member attached to the jamb and the long member attached to the door.
Template Hardware A term indicating any item of hardware that is made to template; that is, exactly matching the master template drawing as to spacing of all holes and dimensions.
Thimble The socket or bearing attached to an escutcheon plate in which the end of the knob shank rotates.
Three-Point Lock A device sometimes required on three-hour fire doors to lock the active leaf of a pair of doors at three points.
Threshold A strip fastened to the floor beneath a door, usually required to cover the joint where two types of floor material meet.
Throw (of a deadbolt or latch bolt) Measurement of the maximum projection when bolt is fully extended.
Thumb Piece (of a handle) The small pivoted part above the grip of a handle to be pressed by the thumb to operate a latch bolt.
Transom Bar That part of a door frame that separates the top of a door or a window from the bottom of the transom.
Transom Catch A fastener applied to a transom and having a ring by which the latch bolt is retracted.
Transom Chain A short chain used to limit the opening of a transom; usually provided at each end with a plate for attachment.
Transom Lift A vertically operated device attached to a door frame and transom by which the transom may be opened or closed.
Tubular Lock (or Latch) A type of bored lock.
Tumbler A guard or obstruction that prevents operation of a bolt except by insertion of the proper key
Turn Piece A small knob, lever or tee turn with spindle attached for operating the deadbolt of a lock or a mortise bolt. Also termed Thumb Turn.
Two-Point Latch A device sometimes required on three-hour fire doors to lock the inactive leaf of a pair of doors at top and bottom.
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