HB 8346-2013 GH2132镀银螺纹公差带6e头部2个保险丝孔小六角头螺钉 HB 8348-2013 1Cr17Ni2螺纹公差带6g头部1个保险丝孔小六角头螺钉 HB 8349-2013 1Cr17Ni2镀铜螺纹公差带6g头部1个保险丝孔小六角头螺钉 HB 8338-2013 TC4螺纹公差带6e头部2个保险丝孔MJ螺纹六角头螺钉 HB 8345-2013 GH2132镀铜螺纹公差带6e小六角头螺钉 HB 8364-2013 1Cr17Ni2螺纹公差带6e头部1个保险丝孔长螺纹小六角头螺栓 HB 8363-2013 1Cr17Ni2螺纹公差带6e头部1个保险丝孔中螺纹小六角头螺栓 HB 8365-2013 1Cr17Ni2镀铜螺纹公差带6e头部1个保险丝孔长螺纹小六角头螺栓