Ball Joint for Gas Spring Accessories 1)Tensile strength: RM=600N/mm2 (ball stud) RM=500N/mm2 (ball socket) 2)Material: Steel, stainless steel, low carbon steel, etc 3)Surface protection: Phosphatized and oiled Optional: Electroplated, galvanized in white-blue or yellow, passivated by chrome or nickle. 4)We have ISO9001:2000 quality system. 5) Size can be custom-made. OTHER: