The METRIC BOLT&NUT is 12.9,the product can be customized
The mechanical grade is 12.9, case hardening HRC 38-42, Material is 40CR,and the surface is treated with bluing and phosphating, screw thread has two type description, one is the metric system:M12-M24-6g, another is denominator system:1/2"-1"/4--2A.the specification can be customized.
METRIC BOLT&NUT
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