| 摘要 |
For indicating when the tension in a bolt reaches a predetermined value, there is provided an electrical contact (24) which is held in a position adjacent to an axially facing surface (20) of the bolt and in a fixed position relative to a remote part of the bolt. Tightening of the bolt reduces the clearance between the contact and the surface of the bolt. When the clearance is eliminated, a bulb (27) is illuminated.
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