... 3 3-grade:12.9 segment bolt and nuts,segment bolt nut ,segment bolt and nut Kindly let ... website: http://www.qzdtk.com The SEGMENT BOLT&NUT is 12.9,the product can be customizedThe mechanical ... HRC 38-42, Material is 40CR,and the surface is treated with bluing, screw thread has ... the metric system:M12-M24-6g, another is denominator system:1/2"-1"/4--2A.the specification can be customized.SEGMENT ...