Industrial pumps and gas generators are driven by long steel shafts. When such shafts undergo heat treatment, it is imperative that they do not become warped by high temperatures. If these objects are annealed horizontally – resting on minimal support points – then there is a high risk that the shaft will start to sag and exit the furnace slightly crooked. And that’s an undesirable situation, because even a slight warp will cause serious vibrations at high rotation speeds. Placing the shaft in a vertical hanging position prior to annealing prevents such warping from occurring and guarantees the straightness of the shaft.