螺纹                          

● 1/3圆柱形，2/3圆柱形及圆柱形   

  -理想的应力分布                  

 -防止螺钉脱出  

                  
 -易于植入      

   Screw Thread

●1/3 Cylinder,2/3 Cylinder & Conical
- Optimal stress distribution
- Protection of screw pull-out
- Easy insertion