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Rectangular Section. Die springs are primarily used in die machinery.For die springs, yellow color here represents that the loading grade is light load.Additionally, we want to tell you: in the yellow, blue, red, green, brown die springs, YELLOW ones are the lightest load ones.However, because die springs are well suited for high stress applications, they are also suitable for a variety of other applications as well.FAQ: What is Hole Dia? What is Rod Dia? Hole Dia: The Diameter of the Hole on the Mold ,i.e.the Outer Diameter of the spring. Rod Dia: The Diameter of the Rod that is to be inserted into this spring, i.e.the inner Diameter of the spring.