safety bolt


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Noun1.safety bolt - a bolt that cannot be moved from outside the door or gatesafety bolt - a bolt that cannot be moved from outside the door or gate
deadbolt, bolt - the part of a lock that is engaged or withdrawn with a key
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References in periodicals archive ?
The crew will also install a safety bolt in an emergency cable cutting system on the station's mobile transporter rail car.
James Walker RotaBolt has launched "Vision" as the world's first safety bolt that gives a visible indication of a loss of tension across a bolted joint that can be seen up to 25 meters away.
The Vision is the world's first safety bolt that constantly monitors tension across a bolted joint and gives a clear visual indication that tension is lost.