Carriage bolt Standard: DIN ANSI BS GB Material: carbon steel or assigned 5mm ~ 20mm diameter:, 1/4 "~ 3/4" Length: 8mm ~ 200mm, 5/16 "~ 8" Threaded: metric, thick tooth, fine teeth, imperial Mechanical properties: 4.8, 6.8, 8.8, 5.8, 9.8, 10.9 and 12.9 Surface treatment: the natural color, galvanized, black, nickel, chromium plating, galvanizing Packing: carton, carton, sacks, pallets