bolt washer assembled 带垫圈的螺栓
On the basis of observation of the ruptured section of a bolt, the author analyzes the assembled condition of the bolt. As a result, the rupture reason is found out.
对断裂螺钉的断口观察，分析了螺钉的装配情况，找出了断裂原因。
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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