Abstract: A method of inductively heating and quench hardening an elongated camshaft having a central axis, an elongated body portion, at least three axially spaced bearing surfaces on the body portion, and axially spaced cam surfaces on the body portion and encircling the axis, this method comprises: providing a generally cylindrical multi-turn inductor having an elongated workpiece receiving opening extending in a given direction, rotatably mounting the camshaft in the workpiece receiving passage, rotating the workpiece about its given axis, energizing the inductor with a high frequency alternating current, continuing the energizing and rotating step until the surfaces are inductively heated to a quench hardening temperature, removing the workpiece from the workpiece receiving opening, clamping the workpiece on at least three of the bearing surfaces for rotation about a quench axis corresponding to the camshaft central axis, restraining at least three clamped bearing surfaces from transverse movement, and then quench