A Spline Taper Mandrel is a precision holding tool designed to locate and support a workpiece with an internal spline by using a tapered spline profile. Unlike an expanding spline mandrel, it achieves its holding power through the wedging action of a slight taper rather than mechanical or hydraulic expansion.

To locate and grip a component internally using its spline. To ensure concentricity and accurate alignment with the machine spindle. To provide a quick, rigid, and repeatable workholding method for machining or inspection.