Double end threaded rods 2)Material: Carbon steel, B7, 42CrMo 3)Surface: Plain, Black, HDG, Dacromet, etc 4) ... , Petroleum and Petrochemical field, etc..1) Product name: Double end threaded rods/stud2) Size & length: According to customer's requirements3) Material: ... Carbon steel, Alloy steel, B7, 42CrMo, etc4) Standard: DIN, ANSI, BS, JIS, GB, ISO, ...