High-strength Bolt 1.Diameter: M6-M30 2.Length: 10MM - ... in China.Mainly include: hex bolt and nut, high-strength bolt and nut, round nut, octagon nut,double endbolt ... ect. High-strength Outer Hexagonal BoltMaterial : Carbon steel, alloy steel1.Nominal Diameter: ... M6-M302.Length: 10mm-250 mm3.Grade of Strength : 4.8,8.8,10.9,12.94.Standard ...