... zinc plated,phosphated 3.size:M8-M48 4.grade:8.8,10.9,12.Bolts and nuts ... industry, pharmaceutical plants and steel boiler steel. System metallurgical plants, railway bridges, airport hangar, port machinery, high ... bolt: Treatment: HDG, Zinc, Black... Carbon steel: Grade/class 4.8, 5.8, 8.8, 10.9 ... on .1.Materials: Low carbon alloy steel2.Property grade:10.9s3.Standard: A325 A4904.Size: Dia.: 5 ...