As the knurled collar is embedded in the sheet ,the undercut cavity beneath the collar is filled with displaced sheet material, thereby captivating the fastener in the sheet.

 
  • 当花齿深深嵌入面板的时候,螺母的底部中空部分会被面板材料完全填满,因此螺母能完美的镶嵌在面板里。
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