Carriage bolt/round head square neck bolt Standard: Ansi/asme b18.5;din603;gbt12;gbt14 Size: 1/4â?�-1â?�;m5-m20 Material: Carbon steel, alloy steel, stainless steel, brass Grade: Class 4.8, 5.8, 6.8, 8.8 Thread: M, unc, unf Finish: Plain, zinc plated(clear/blue/yellow/black), black oxide, nickel, chrome, h.D.G Packing: Bulk in cartons (25kg max.)+wood pallet or according to customer special demand Application: Structural steel;metal building;oil&gas;tower&pole;wind energy;mechanical machine;automobile;home decorating Equipments: Caliper, go&no-go gauge, tensile test machine, hardness tester, salt spraying tester, h.D.G thickness tester Supply ability: 1000 tons per month Minimum order: 500kgs for each specification Trade term: Fob/cif/cfr/cnf/exw/ddu/ddp Payment : T/t, l/c, etc Market: South&north america/europe/east&south east asia/ australia and etc. Our advantage: One-stop shopping; high quality; competitive price; timely delivery; technical support; supply material and test reports; samples for free Notice: Please lets know the size, quantity, material or grade, surface, if it is special and non-standard products, please supply the drawing or photos or samples to us -