When you put a nut on a machine screw it doesn't cease to be a machine screw, but it works and I do it frequently. However, the document accounts for this in se

When you put a nut on a machine screw it doesn't cease to be a machine screw, but it works and I do it frequently. However, the document accounts for this in section 3: "Because of basic design, it is possible to use certain types of screws in combination with a nut. Any externally threaded fastener which has a majority of the design characteristics which assist its proper use in a tapped or other preformed hole is a screw, regardless of how it is used in its service application."