Which finish number indicates a mirror finish on stainless steel?

A mirror finish on stainless steel is indicated by a finish number of #8. This finish is achieved through a series of polishing processes that result in a highly reflective surface, almost resembling a mirror. The #8 finish is characterized by its smooth, polished appearance and minimal surface imperfections, making it ideal for applications where aesthetics are important, such as in architecture or decorative elements.

In contrast, other finish numbers do not achieve the same level of reflectivity. For instance, a #6 finish has a gloss but is not as reflective as #8. A #5 finish typically has a more uniform grain and is not polished to the extent needed for a mirror-like quality. The #7 finish can achieve a high shine but is generally not classified as a true mirror finish. Therefore, the #8 finish distinctly stands out for its shiny, polished characteristics that define a mirror finish on stainless steel.