... DIN975 2.Material: Carbon Steel. 3. Size: M3-M56,1M-4M; 4.Surface Treatment: Zinc,Black HDG We also have ... (UNC), European type, Japnese type, etc... Material: low carbon steel, mild carbon steelStandards: ISO, DIN 975, ANSI, JIS, GB, ... ), according to the customers requestsSurface treatment: plain, white zinc plated, blue-white zinc plated, yellow zinc plated, hot dipped galvanization, black HDG.