Deadlatch
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deadlatch — ˈ ̷ ̷ˌ ̷ ̷ noun : a spring bolt latch in which the bolt is deadlocked against end pressure but may be retracted by either the knob or the key … Useful english dictionary
Latch (hardware) — Window latch Door latch A latch (called sneck in Nor … Wikipedia
effective throw — n. the distance a deadlatch remains projected when the guard bolt has been engaged and end pressure is applied to the latch … Locksmith dictionary