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, in OD, in Lo in N Material 0.148 2.12 2.5 5.75 A227 hard-drawn steel