| 摘要 |
A device for automatically tightening threads of a threaded connection, in which the threads of, for example, bolts are adapted to be tightened in such a manner that a yielding of the material occurs in the shanks of the bolts; the device is provided with a measuring installation which measures, when the yield point is reached, by the change of the tightening torque of as function of the change of the rotation of the bolt and then turns off the device for tightening the bolt.
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