An alignment shaft is a precision machined shaft used to align two or more rotating machines, such as pumps, motors, and gearboxes. It is usually made of high-strength steel or other materials that can withstand the stresses and loads of the machines, and is designed to fit snugly into the bearing bores of the machines. The alignment shaft is typically inserted into one machine while the other machine is adjusted to align with it, using specialized alignment tools such as laser or dial indicators. Once the machines are properly aligned, the alignment shaft is removed and the machines can be bolted into place for operation. Alignment shafts are critical components for ensuring optimal performance and reliability of rotating machinery.