Tonight I've had a deceptively simple question that I've found maddeningly difficult to get an answer to. What I'm looking for is a list of springs with information on how much they can be compressed and how much energy they store. E.g.: Steel spring from company A has dimensions X, Y, Z and can be compressed U% holding Vj of energy. Instead though all I can find is explanations of Hooke's law and hypothetical examples. Most sites seem to assume that the person asking has a spring they want to rest and so can just figure out energy storage by piling weights on and working through Hooke's law. Whereas I'm just looking for a simple set of figures. Any pointers to such a fact sheet would be greatly appreciated!