Swage (PEM) Studs #4-40 through 1/4-20 collection

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PEM Studs, ranging from #4-40 through 1/4-20, are press-fit hardware components used in sheet metal applications. They feature a design that allows material to flow into grooves upon applying pressure, locking the nut in place by swaging the surrounding material. PEM studs are a brand name by Penn Engineering & Manufacturing Corp., often used generically for swage studs from any manufacturer. These studs permanently anchor themselves to sheet metal and are typically made of hard materials like stainless steel that are inserted into pre-drilled holes in softer ductile metals, such as aluminum. The shank has three diameters: a main shaft fitting the hole closely, a thin undercut, and a larger serrated clinching ring for swaging into the soft metal, securing the nut in place while preventing rotation with its knurling feature. This method is popular for adding strong, load-bearing threads to thin sheet metal pieces.