| 摘要 |
A torque limiting gripping device for a bolt head or a nut comprises a grip element threaded on the bolt head or nut and provided with external gripping surfaces for a wrench or other tool. The free end of the bolt head or nut is provided with an abutment against which the grip element is screwed during manufacture to produce pre-stressed engagement. When using the torque-limiting bolt or nut thus produced the bolt or nut is tightened by means of the grip element, which begins to rotate on the bolt head or external nut threads when the rated torque, which is about equal to the pre-stress torque, is exceeded.
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