This air handler fan shaft is a component of an HVAC ventilation system, and is composed of C1215/C1144 cold rolled steel. Machining consisted of rough and finish turning and facing to dimensions of 10.250″ (± 0.015″) in length, and an outside raw material diameter of 1.000″ (+0.000″/-0.002″), and met machined tolerances within .0007″.