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有頭內六角螺絲

      
               ■ 級數:12.9 
                   Class12.9 

               ■ 抗拉強度:抗拉強度:1220牛頓/平方厘米
                 
Tensil Strength(min):1220N/mm2

               ■ 材料:SCM435鉻鉬合金鋼    
                  Material:SCM435 (Alloy Steel)

               ■ 心部硬度:HRC39-44
                   Hardness:HRC39-44


               ■     級數: A2          ■ 材料:302HQ
                   ClassA2              Material:302HQ