Case hardening adds wear resistance (hardness) and fatigue resistance - at least that is what I remember from a class I took in the seventh decade of the last century. So you would add wear resistanceat the fences, the pin holes, the lever, the safety slide, the knuckle etc... I would think the fatigue resistance would be needed at the interesection of the fence and the water table.

From the class I think I remember coil springs being case hardened for some applications.

Best,

Mike


I am glad to be here.