Kinsom fasteners update new Digital Rockwell hardness test machine for HRB HRC HV to control quality. Auto sorting machine: Kinsom always test 100% of our production lots to ensure absolute quality. If our customer require class 8.8-12.9 customized fasteners, throughout every step of the manufacturing process we utilize in-process controls, we still can control on our own testing room with the hardness tester. No matter with HRC HRB or HV hardness, final 3 rounds inspections when export out.