Bu lông đầu lục giác bằng thép hợp kim Din912-12.9

Grade 12.9 high-strength screws are also relatively common in life, and their scope of use is also very wide. This 12.9 grade high strength screw is mainly made of SCM435 alloy steel material in production, which has a small tensile strength of 1220Mpa and a hardness of 39 ~ 44HRC.The products are widely used in the fields of automobile, machinery, mold, electronics and construction.