Threaded insert
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A threaded insert, also known as a threaded bushing or insert nut, is a fastener element that is inserted into an object to add a threaded hole. They may be used to repair a stripped threaded hole, pr
A self-tapping insert
A helical insert. The straight radial piece is the driver tang which is used to grip the coil while driving it into place. It is broken off and is discarded after installation.
Rampa- or screw-in nut
T-nut
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A T-nut, T nut, or tee nut is a type of nut used to fasten a wood, particle or composite materials workpiece, leaving a flush surface.
T-nuts. The left one has been inserted in the wood and a bolt has been screwed in from the other side.