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Tee nuts are used whenever machine screw threads are needed in wood for permanent installations or to allow for knockdown and reassembly. They consist of an internally threaded barrel and an integral round base with three (or possibly four) perpendicular prongs adjacent to the barrel. The prongs prevent the tee nut from rotating as the bolt/screw is tightened and help hold the nut in place. Tee nuts are also know as:
pronged tee nuts, T nuts.
Threads are standard right-hand and usually Unified inch coarse series (UNC, Unified National Coarse); Unified inch fine (UNF, Unified National Fine) may be available.
Tee nut size refers to its nominal thread diameter. Typically, sizes range from about #6 to 3/8". Sizes less than 1/4" appear as a number size (the larger the number the larger the size) while sizes that are 1/4" and larger are specified in inches, usually fractional rather than decimal.
The diameter and length of the threaded barrel, the diameter of the flange and the length of the prongs all vary with the size of the tee nut.
Steel, zinc plated, is a common material and finish; stainless steel may be available as well.
To install, drill a hole slightly larger than the outside diameter of the threaded barrel. Insert the tee nut from the backside—so the bolt/screw will pull against the base—then tap the nut flush into position.
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