| 摘要 |
A self-tapping insert is installed in a pre-existing bore hole in a workpiece by rotating the insert, causing cutting threads on the exterior of the self-tapping insert to cut new threads. Engagement threads on the exterior of the self-tapping insert engage the new threads to retain the self-tapping insert within the workpiece. The self-tapping insert may comprise internal threads which are used to replace damaged threads in the workpiece. The exterior threads of the self-tapping insert may be configured as left-handed threads, while the internal threads are right-handed threads. The top of the self-tapping insert may comprise a recessed hexagon configuration, and a drive device having substantially the same configuration may be employed to install the self-tapping insert, eliminating the need for a drive-bolt or special tooling, and allowing the counter-clockwise installation of the self-tapping insert. The exterior of the self-tapping insert may further comprise an integral pilot for aligning the insert straight with the axis of the bore, as well as a leading edge for cutting the new threads, which edge has a radial extension equal to or greater than the trailing edge.
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