... from: M5 - M42 Length: 10mm-200mm Hexagon head bolt: Treatment: HDG, Zinc, Black... Carbon steel: Grade/ ... high quality products such as bolts, high strength bolts, screws, nuts, threaded rod, anchor bolt, nail, other off-standard ... can manufacture by requirement. Steel structure hexagon head bolts TypeGradeMaterialSpecificationHardnessBolt10.9S20MnTiBM12-M30HRC33-3935VB8.8S40BHRC24-3145#35#Nut10H45#, ...