The polygon shank cone is a powerful interface that has proven its effectiveness especially in multitask machines. Launched on the market in 1990 under the name Coromant CAPTO, it was internationally standardised under ISO 26623 after the patent expired. The main feature of the polygon shank cone is its unique tapered polygonal shape which, due to its self-centring properties, effectively prevents axial and radial play. The face contact accurately defines the position of the tool in the holder and produces excellent repeat accuracy. The polygonal shank cone is therefore ideal for high-precision applications. The PSC interface features excellent stiffness due to the large taper diameter. Additionally, the balanced distribution of torque over the polygon surface generates maximum stability. The polygon shank cone is a powerful interface that has proven its effectiveness especially in multitask machines.