| 摘要 |
An indicator to check whether a screw connection has been properly tightened, comprising a housing to be penetrated by the screw bolt, and having a bottom at one end and a slide-fit disc at the other end, compression springs housed within the housing and being compressed by the tightening force, the relative position of the disc within the housing being representative of said force, and visible or tangible for check of proper tension.
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