We are manufacturers, supplier and exporter of Din 931 bolt in India. The steel quality used to manufacture of the DIN 931 grade 8.8 bolts includes Grades A2 and A4 class 70. the steel quality used to manufacture of the DIN 931 grade 8.8 bolts includes Grades A2 and A4 class 70. The tensile strength for both these steel grades is around 700 Mpa. The strength of the DIN 931 bolt M10x18 is indicated by the marking on the head and it is also defined by the applicable product standard. The grade A4 70 manufactured from stainless steel in low temperature. BigBoltNut Manufacture Din 931 hexagon head bolts dimension, We are exporting Usa, Uk and Middle east countries.