This paper studies the wear characteristics of hardened die steel and SiC whisker-plastic composite when they slide against each other. Moreover, a new application of the composite is introduced. It has been demonstrated that the wear of hardened die steel can be minimized by the addition of graphite powder to the composite and aligning whiskers parallel to the contact surface. Alternatively, the wear can be maximized by aligning whiskers normal to the contact surface and applying oil lubrication. The conditions that maximize the wear of hardened die steel were applied to the surface finishing process. By this method, an ultra-fine finish with a surface roughness of R a = 2 nm could be obtained.