... , 8, 8.1, 10, 5) Model: DIN934,3. High intensity nut& bolt:1) material: 40Cr,42CrMn 45# etc2) Surface : Zinc (white, blue ... :M20- M48 4) Grade:8.8,12.94.Stainless steel nut& bolt: 1) material: A2,A4,Sus304, Sus316, carbon steel ,45# etc2 ... , 12.95) model:DIN98 ,DIN987,GB889.16) QC: SGS5. Wing nut & bolt: 1) material: alloy stainless steel , brass,Sus304, Sus316, carbon steel ...