T Nut - Steel M4 To M12 | White & Yellow Plating, Flush Surface Design, Flanged Body With Serrated Prongs For Enhanced Retention

A T-nut, which can however also refer to a rivet nut or an insert nut, and likewise drive-in nut is a type of nut used to fasten a wood, particle or composite materials workpiece, leaving a flush surface.

It has a long, thin body and a flange at one end, resembling a T in profile. The flanges of T-nuts often have hooks or serrations on the prongs that dig into a wooden work piece as the bolt is tightened from the opposite side of the piece, providing better retention.

T-slot nuts, which are used in work-holding in machine tools. T-slot nuts fit in T-section slots in the machine work-table and are used in conjunction with studs and clamps to provide flexible means of holding workpieces in place.
Weld nuts, which are similar in appearance to t-nuts. They lack the prongs which penetrate into wood. Weld nuts are usually spot-welded into place on metal.