Material: Version A: Free cutting steel, black oxide finish. Ball: Stainless steel, hardened. Spring: Stainless steel. Temperature range -30°C to +50°C. Version B: Free cutting steel, burnished. Ball: Steel, hardened. Spring: Plastic. Temperature range -40°C to +80°C. Note: The side thrust pin is pressed into the bore by at least as far as the measure l3. It serves to position, hold or clamp small workpieces inside fixtures. If the workpiece is machined, additional clamping devices might be required for holding it safely in place. If fixtures are stored please make sure that the plastic spring is not loaded. *statistical average