WHAT IS DEADLATCH

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Answer
DISCONTINUED: The Falcon T lock had a reinforcement kit for a 1 3/4" thick hollow metal door that prevents lateral movement of the latch. It is a piece of hard foam shaped like a doughnut...
Night Latch (NL)= key retracts the latch momentarily to allow entry. When key is removed, the latch will extend and locks the door (momentary unlock). Class Room (Lock/ Unlock)= key unlocks...
The standard latch projection is 1/2".  Falcon also offers a 3/4" throw with a 2-3/4" backset.
For T locks shipping mid-June 2013, the new latch can be identified by viewing the deadlatch profile. The profile of the deadlatch has changed from a "full moon" to a "half-moon". See figure below....
Deadlocking Latch Bolt