1. The problem statement, all variables and given/known data The first theory shows a spring under an axial load where the Torque is given as WRcos(a) The second theory shows a spring under axial Torque. T is given as Wsin(a) 2. Relevant equations Given in links 3. The attempt at a solution A torque T would be at full strength along the X axis, where cos(0) = 1. Where a bending moment would be at full strength along Y where sin(90) = 1. It seems to be other way around though, what am I missing?