Scrap Nut
Many stock bolts are designed to self-thread into unthreaded blocks of steel, which are cheaper for the factory to produce & install for optional equipment than threaded nuts would be. So for body modifications, it's convenient to weld on a scrap of steel that's simply drilled the correct size, and run an original bolt through.
For chairs, consider the long-term effects of a 200-lb human rocking around in the 40-lb chair on this ~20-ga sheet metal.
![scrapnut.jpg Scrap Nut
Many stock bolts are designed to self-thread into unthreaded blocks of steel, which are cheaper for the factory to produce & install for optional equipment than threaded nuts would be. So for body modifications, it's convenient to weld on a scrap of steel that's simply drilled the correct size, and run an original bolt through.
For chairs, consider the long-term effects of a 200-lb human rocking around in the 40-lb chair on this ~20-ga sheet metal.
[url=https://www.supermotors.net/registry/2742/54308-2][img]https://www.supermotors.net/getfile/470222/thumbnail/tsb900612floorreinf4.jpg[/img][/url]](https://www.supermotors.net/getfile/930555/fullsize/scrapnut.jpg)