| 摘要 |
A fastener including a sheet metal plate having a central stamped and apertured portion forming a screw thread, the aperture having a mean diameter sized approximately 5% less than the root diameter of a screw to be used therewith. The stamped portion is formed with a plurality of slits extending generally radially of the aperture and spaced equally around the thread to define a plurality of independent, generally equally sized sectors having contiguous edges and which sectors are adapted to tightly grip the root of the screw. In addition, a U-shaped, bent, sheet metal clamp adapted to slip over support bases to be fastened together is provided where the described sheet metal plate is one of the clamp's legs. The method of making this fastener includes the steps of forming the screw thread portion of the fastener in a metal plate, forming gapless slits in the screw thread portion, and forming a central aperture in the slitted screw thread portion.
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