Raymond® ISO D-Line Extra Heavy Duty Series Die Springs (ISO 10243 Specifications, D Shape Wire Section, Direct Replacement for other ISO 10243 parts) are available in the sizes below. If you need details regarding spring terminology see our FAQ. Looking to purchase Die Springs? This product line is not available for sale online, but please contact us or a distributor. If your application requires a die spring that you cannot find, look to Associated Spring RAYMOND\'s engineered solution services for a custom solution.