1.Auto parts material is steel 20 or Q235 2.Test according ... material is usually steel 20, coated yellow Zinc. Commodityauto parts, hose fittingsMaterialMild steel, stainless steel, aluminum, copperThread standardsMetric: M10X1, M10X1.25 ... ; wedge; cold heading; casting,OtherMetal accessories, rubber accessories, plastic accessories auto parts