Specification: Name: Compression Die Spring Material: Spring Steel Colour: Yellow / Blue / Red / Green / Brown Outer Diameter: 20mm Inner Diameter: 10mm Load Index: Yellow < Blue < Red < Green < Brown Compression Ratio: TF - Yellow (Lightest Loading): 58% TL - Blue (Light Loading): 48% TM - Red (Medium Loading): 38% TH - Green (Heavy Loading): 28% TB - Brown (Extra Heavy Loading): 24% Features:Small size, good elasticity, high stiffness, high precision, beautiful appearance, etc. Applications: Widely used in stamping dies, metal die-casting dies, plasticmolds and other elastic motion precision machinery and equipment, automobiles and other fields. Yellow and blue are mainly used for plastic moldassembly; red, green and brown are mainly used for hardware assembly.