New PEM® Type SMPP™ self-clinching nuts from PennEngineering® install permanently in ultra-thin stainless steel sheets and provide dimensionally ideal solutions for stainless assemblies where space for attachment hardware may be limited. A minimal footprint resulting from an overall low-profile design combines low height (.065” / 1.4mm) and small diameter (.220” / 5.6mm) with close-to-edge mounting capabilities for installation in stainless steel sheets as thin as .025” / 0.64mm.
http://www.fastenerjournal.com/index_htm_files/PEMNuts040616.pdf