squeezing screw [机] 挤压螺丝
single screw squeezing expansion machine 单螺杆挤压膨化机
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The squeezing action forces the displacer of the screw into the sheet, causing it to reduce the mounting-hole diameter and captivate the screw.
挤压动作迫使薄板金属塑性变形，并使安装孔的直径变小，从而使螺钉松不脱。
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