A British engineer, John Hirst, demonstrates his invention, the Rotabolt, which shows when a bolt is securely tightened. The Rotabolt will fit any size of bolt. As the bolt stretches during tightening, a gap closes until the correct load setting is reached.
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Press, 1 July 1985, Page 32
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42A British engineer, John Hirst, demonstrates his invention, the Rotabolt, which shows when a bolt is securely tightened. The Rotabolt will fit any size of bolt. As the bolt stretches during tightening, a gap closes until the correct load setting is reached. Press, 1 July 1985, Page 32
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