Numerous surface finishes can be achieved by CNC milling stainless steel, contingent on the specific requirements of the part and the desired aesthetic appeal. Some of the most common surface finishes include:

• Rough milled: The rough texture of this finish is a result of the milling process. It is commonly applied to parts that will be painted or coated, or to parts that do not require a high surface finish.
• Polished:The stainless steel is polished to create this finish using a polishing wheel. Applying it to parts that require a high level of visual appeal often results in a highly reflective surface.
• Smooth milled: This finish is produced by using a finer milling tool at a lower cutting speed. It produces a smoother surface than rough milling, despite not being as smooth as some other finishes. Smooth milled parts are often those that will be seen but do not require a high polish.
• Brushed: A wire brush is used to buff the surface of the stainless steel to achieve this finish. It produces a matte, uniform finish that is commonly used in decorative applications.
• Bead blasted: This finish is achieved by blasting tiny beads onto the surface of the stainless steel. It produces a rough, textured finish that is commonly applied to parts that are subjected to wear and tear.

A stainless steel part's surface finish can significantly affect how it functions and looks. Parts that are visible from the outside of a product require a polished surface finish, whereas parts that are used in food processing or medical devices, for example, require a smooth surface finish.