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Meanings of safety bolt in English

A bolt that cannot be moved from outside the door or gate.

Usage of safety bolt in English
1
Given the context, it was undoubtedly implying that it was a climber's safety bolt.
Rock and Ice Magazine
2
And there I saw a photo presented, at long last, as an example of where climbers had placed a safety bolt in rock art.
Rock and Ice Magazine
3
"Oh, that's the safety bolt," he said.
Colonel Quaritch, V.C.: A Tale of Country Life