(1) Description:..Materials: Carbon Steel / Alloy Steel..Surface Treatment: Hot Dip Galvanizing / Black Oxide..Available Specification: M12M100..Mechanical property Grades: Gr.4.8, Gr.6.8, Gr.8.8, Gr.10.9..The available angle is 45°～90° ...We can fabricate the bolts and nuts according to the stardard of DIN, ISO, ANSI, BS, JIS . (2) Productivity:..25000 tons per year