What does the color of the stamping die spring represent

The color of stamping die springs is mainly used to distinguish their load level, compression amount, and elasticity. The common colors of mold springs and their representative loads and compression amounts are as follows:
Yellow: light load, compression capacity of 50%.
Blue: light load, compression capacity of 40%.
Red: Medium load, compression of 32%.
Green: Heavy load, compression capacity of 24%.
Brown: Heavy load, compression capacity of 20%.
In addition, different colors may have different names in different standards. For example, in the United States Joint Standards, blue, red, golden yellow, and brown are respectively used for medium load, medium load, heavy load, and overweight.
The difference between different colors in specific applications
Yellow spring: commonly used for row position reset and top pin plate reset on plastic molds, belonging to light and small load.
Blue spring: suitable for plastic molds that require greater elasticity, usually used for light loads.
Red spring: Used for medium load situations, although less commonly used in plastic molds.
Green spring: suitable for heavy load situations.
Brown spring: suitable for heavy loads, commonly used in punching dies and forming dies.
Color standard for mold springs
The color standards for mold springs include international standards, Japanese standard JIS, American standard, German standard, etc. For example, Japanese Standard B5012 stipulates that yellow, blue, red, green, and brown represent small load weight, light load weight, medium load weight, heavy load weight, and overweight load weight, respectively.