松不脱螺钉 Can't take off screws ; Pine doesn't bolt ; PF ; Captive screws
松不脱
Not loose.
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
The squeezing action forces the displacer of the screw into the sheet, causing it to reduce the mounting-hole diameter and captivate the screw.
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