thread bars 1.Siz: M6- M24 2 Material: Carbon steel 3 Grade:4.8, 5.8, 6.8, 4 Standards: DIN 975 threaded rodWe ... rods. Material: Low carbon steel, mild carbon steel Standards: ISO, DIN 975, ANSI, JIS, GB, BS, etc Grade: 4.8, 5.8 ... zinc plated, yellow zinc plated, hot dipped galvanization, black. threaded rod,thread bars,thread rod