Trigger bolt | Article about trigger bolt by The Free Dictionary
trigger bolt[′trig·ər ‚bōlt]
auxiliary dead latch, auxiliary latch bolt, deadlocking latch bolt, trigger bolt
A supplementary latch in a lock which automatically deadlocks the main latch bolt when the door is closed.
References in periodicals archive
Bolt Lift and Trigger Bolt
lift on the Zephyr II is unusually light for any bolt-action rifle, but especially for a rimfire.
Up inside the frame you can see the trigger bolt
spring (19) and its screw (35).