ISO 4032 - Black (Class 8) Technical Specification Materials: Crabon Steel, Alloy Steel,& Stainless Steel Class: Class 6,Class 8,Class 10,Class 12 Size: M5 to M30 (in cold forging), 3/16" to 1" (in cold forging) Finish: Plain, White Zinc Plated Features High Grade Raw Material Dimensionally Accurate Corrosion & Abrasion Resistant PPAP Requirements