Sheet metal rivet nuts, expansion rivet nuts, and pull rivet nuts are three different ways of fixing nuts, and their differences are as follows:
1. Riveting nut: Riveting nut is a method of fixing the nut onto the sheet metal by riveting. Riveting nuts usually require drilling a hole in the sheet metal, and then pressing the nut into the hole through the riveting tool to tightly fix it with the sheet metal.

2. Expansion rivet nut: Expansion rivet nut is a method of fixing the nut onto the sheet metal through expansion riveting. Riveting nuts usually require drilling a hole in the sheet metal, then placing the nut into the hole and using a riveting tool to tightly secure it with the sheet metal.
3. Rivet nuts: Rivet nuts are used to fix nuts onto sheet metal by riveting. Riveting nuts usually require drilling two holes on the sheet metal, then placing the nut into the hole and firmly pulling it together with the sheet metal using a riveting tool.
