Wahl Factor

Industry-grade compression spring calculator: spring rate, Wahl/Bergsträsser stress, Goodman fatigue, buckling load SF, surge safety factor, permanent set risk, energy stored, dynamic force, pitch check — SMI / IS 7906 / EN 13906.

Calculate extension spring rate, initial tension, hook bending stress, body Wahl stress, fatigue life (Goodman), and max safe extension. Covers SMI and IS 7906 Part 4 standards with 10 materials and 5 hook types.