We supply countless parts to our diverse customer base that incorporate one or more secondary services and finishes. This stainless steel 4/40 X 3/16 phil pan machine screw is a good example. It is made using 18-8 stainless steel and is then run through a Class 2 Black Oxide treatment. The final step is a nylon 11 thread locking patch application. We supply these specific machine screws to our customer on a revolving annual blanket purchase order basis.