single latch bolt mortice door 单斜舌按钮插芯门锁
The combined latch bolt helps to open the door easily and reduce vibration.
组合斜舌，协助轻松开门，减少震动。
Slam latch is screwed onto latch support which is either screwed or welded to the door. Assembled without insert it can be opened with a tapered square key. Bolt has free stroke.
这种锁舌用螺丝装在锁支架上，而锁支架用螺丝固定或焊接在门上，无锁芯的装配时，可用锥形四方匙开启锁栓为自由行程。
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