Die springs are primarily used in die machinery. The inner diameter is generally half of the outer diameter. Yellow color indicates an extra light load grade, while brown color indicates the heaviest load grade. Widely used in stamping dies, metal die-casting dies, plastic dies, and other precision machinery and equipment requiring elastic motion, including automotive applications. Features: - Designed for use in die machinery - Inner diameter is approximately half of the outer diameter - Yellow color signifies extra light load capacity - Brown color signifies the highest load capacity - Suitable for stamping, die-casting, plastic molding, and precision mechanical equipment - Commonly used in automotive and industrial applications Specifications: - Model (OD*Length): TF12*20mm, TF12*30mm, TF12*40mm, TF12*50mm, TF12*60mm, TF12*70mm, TF12*80mm (Optional) - Material: 65MN Steel - Color: Yellow - Load Grade: Extra Light Load - Outer Diameter: 12mm - Inner Diameter: 6mm Package List: 2 x Die Spring