Hex Bolt 12.9

Class 12.9 bolt has the highest percentage of carbon among all bolt materials and has had heating and tempering process on its rod prior to production. Class 12.0 bolt has 1220 Mpa Tensile, 1100 Mpa Yield stress and 38-44 Rockwell hardness. Class 12.9 bolt is manufactured following ASTM F568 standard.