四方栓
Square bolt
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
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.
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