Listed in the tables are six springs described in customary units and five springs described in SI units. Investigate these squared-and-ground-ended helical compression springs to see if they are solid-safe. If not, what is the largest free length to which they can be wound using ns =1.2?

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d,mm OD, mm Lo, mm Nt Material 4.5 69.2 215.6 8.2 A232 chrome-vanadium