Product instruction:Used in general engineering,Website:http://www.nbzhencheng.com,non safety critical application.Such as building making,aviation,shipbuilding,road construction,home decoration.Hexagon screw is composed by finger and screw, it is divided into steel bolt and stainless steel bolt according material. The steel bolt divided into grade 4.8 bolt, grade 8.8 bolt. Stainless steel bolt divided into stainless steel SUS201 bolt,SUS304 olt,SUS316 bolt according material.Place of Origin:Zhejiang, China (Mainland)Brand Name:ZCStandard:DIN Material:Carbon SteelFinish:Blue Zinc PlateSurface treatment:Heat TreatingType: HEX FLANGE HEADColor:Zinc WhitePacking:CartonItem:China FastenerApplication:BuildingPackaging Details:Small box, carton, pallet, nylon bag, for self drilling screwProduct Description1. Grade: C10222. Size: ST4.8, ST5.5,ST6.33. Length:13-120mm4. Standard: DIN 5. Certification: ISO9001, CEProduct Name:Self tapping screwMaterial: Carbon steelUsed:building industry machinery