Swage nut

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A pair of swage nuts threaded to accept 8-32 screws.

A swage nut is a type of nut or threaded insert is used on sheet metal.

It permanently anchors itself to the sheet metal by swaging the surrounding material. Generally, the swage nut is made of a hard metal such as stainless steel, while it is typically inserted into a pre-drilled hole in a softer material such as aluminum. Pressing the nut in with an arbor press or by tightening a screw through the hole causes the softer material to plastically deform or swage into an undercut in the nut. This locks the nut into the hole, while a knurled portion of the nut keeps it from rotating.[1]


Albert Spokes filed for a U.S. patent on the swage nut in early 1958.[2] The swage nut is descended from an older idea, the clinch nut. Clinch nuts incorporate a tubular shaft that fits through the part to be attached and is clinched or riveted in place from the opposite side. [3][4]

See also[edit]


  1. ^ Smith, p. 112.
  2. ^ Albert Spokes, Nut with recesses to receive metal of the workpiece, U.S. Patent 3,000,420, granted Sept. 19, 1961.
  3. ^ Harold G Renner, Rivetable nut, U.S. Patent 1,502,399, issued July 22, 1924
  4. ^ Arthur Swanstrom, Nut structure, U.S. Patent 2,026,757, granted Jan 7, 1936.