2021-02-03 Kinsom fasteners standard share on GB∕T 3098.13-1996 Mechanical properties of fasteners-Torsional test and Minimum torques for Bolts Screws with nominal diameters 1MM to 10MM from Grade8.8-12.9,more details about the how to test the torques in process of fasteners before shipping out.Kinsom follow the inspection rules and system ISO 9001:2015 certificate.Our weld bolt meet your specific demands.