Support shafts are components of machines that provide stability and strength to the structure. They are usually cylindrical in shape and can be made from a variety of materials such as steel, aluminum, or plastic. The two crossword solutions for the term SUPPORT SHAFT are PILLAR (6 letters) and AXLE (4 letters). A PILLAR is a vertical support that is used to hold up a structure, while an AXLE is a rod or spindle that connects two wheels or other rotating parts. Both of these components are essential for providing support and stability to a machine.