This hex nut is manufactured to ISO 4032 standards and made from Grade 10 steel, making it compatible with bolts and screws up to Grade 10.9. It features a metric thread and a Zinc Flake surface coating per ISO 10683 (flZnnc), which is Cr(VI)-free. This coating blends zinc and aluminum to deliver superior corrosion resistance compared to a pure zinc layer of the same thickness. Best of all, the coating process eliminates any risk of hydrogen embrittlement.