GB/T 3098.13-1996 Translated English of Chinese Standard. (GBT 3098.13-1996, GB/T3098.13-1996, GBT3098.13-1996): Mechanical properties of fasteners - Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm
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This standard specifies the torque test and breaking torque values of bolts and screws with a nominal diameter of 1 ~ 10 mm and a performance level of 8.8 ~ 12.9 (GB 3098.1). This standard applies to bolts and screws whose thread size is smaller than M3 and the minimum tensile load and guaranteed load are not specified in GB 3098.1, as well as the bolts and screws with a nominal diameter of 3 ~ 10 mm whose length is too short to carry out the tensile test.