We analyze our spring’s fatigue life predictions using methods consistent with SAE and SMI guidelines. Essentially, the minimum and maximum operating stresses are calculated and compared to a family of reference Modified Goodman Diagrams. It is best to demonstrate fatigue life capability through testing. This testing is especially important in special cases with unusual spring configurations or the use of non-standard, unique materials. In these cases, MW Components uses reliability engineering techniques to develop test methods. We carefully analyze these test results to ensure our products will meet and exceed customer expectations.