A weld nut is a special type of nut specifically designed to be welded to another object. There are various types for different applications.
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These nuts have a long threaded cylinder with a large circular base to make welding easy. They also sometimes have projections (known as weld nibs or bosses) to keep the nut from warping while welding with a high current.[1]
These are very similar to the round base nuts, but with an obround, or slab shaped, base. These are used in channels, tubes, or other tight quarters.[1]
Tab base nuts are designed for spot welding on flat workpieces. They have a locating boss around the threads to locate it in a pilot hole.[1]
These nuts are very similar to standard square or hex nuts, but have a locating boss and welding projections. The bosses also keep weld splatter out of the threads.[2]
Retainer weld nuts, also known as bridge weld nuts, have a floating nut retained inside a retainer to compensate for inconsistencies. The retainer is welded to the workpiece while the nut is allowed to float.[2]
Tube end nuts are sized to fit into the end of standard sized tubing, thus creating a threaded tube from standard stock.[2]