Abstract: A method and apparatus for improved attachment of an ultra-hard compact, especially a two-layer disk-type PCD compact, to a tool or support surface with a mechanical connection. In general the ultra-hard compact is provided with a tool-engaging threaded end protruding from the compact. The threaded end may be facilitated by a post fitted into a blind hole in the ultra-hard compact, or may be facilitated by a threaded sleeve permanently attached to the ultra-hard compact. In any case, when the ultra-hard compact is threadably engaged into a tool or support surface, the fastening means is hidden with only the wear resistant materials of the ultra-hard compact exposed.

Abstract: A method and apparatus for improved attachment of a PCD compact, especially a two-layer disk-type PCD compact, to a tool or support surface with a mechanical connection. In general the PCD compact is provided with a blind bore in the substrate layer, the bore terminating in the substrate layer and opening onto an outer face of the substrate layer intended to engage or abut the tool or support surface. A mechanical fastener is inserted into the blind bore such that it is secured to the PCD compact to form an integral unit with a tool-engaging end of the fastener protruding from the compact. In a preferred form the mechanical fastener is a metal post having at least one, and alternately both, ends threaded for threaded engagement to both the blind bore (which would have its own threads) and suitable threaded openings on the tool.