Standard: DIN ANSI BS GB
Material: carbon steel or specified
Diameter: 3mm～45mm,18″～1-34″.
Thread: metric, coarse thread, fine thread, inch system
Mechanical properties: 4.8,5.8,6.8,8.8,9.8,10.9,12.9
Finish: natural, galvanized, blackened, nickel plated, chrome plated, hot-dip galvanized