SEMS & SPECIALS Website
As I learned, a SEM is a bolt with a locked on washer attached. It's part of an asSEMbly, which includes nuts and bolts. SEM's are part of every machine that's manufactured; there might be 200 of them in a car, for example. No one knows what the name means, except people in the business. They fasten the world together in securing the essentials is a perfect tagline that they alone can own.