General The mechanic performance table of bolts in China The number before the radix point represents one percent of the nominal tensile strength; The number after the radix point represents ten times of the ratio of the nominal yield limit and nominal tensile strength. Quality Grade( mark) 6.8 8.8 9.8 10.9 12.9 Tensile strength limit max(MPa) b 600 800 900 1040 1220 Yield limit max(MPa) s 480 640 720 940 1100 Corresponding to Hyundai standards 4T 6T 7T 8T 10T