You’ve undoubtedly seen big nuts and bolts of various shapes and sizes over the years, but have you ever taken the time to consider all of their different uses, and how many places in your life that hex bolts and nuts are used. There are over 4,000 screw, nut, and bolt manufacturers in the United States, and the industry generates an estimated $27 billion of revenue. There are many different kinds of screws and bolts, and they have been around, in various forms, for a very long time. Early screws were made of wood, and were used in wine presses,…