My CAD professor today introduced me to McMaster Carr's website. I had heard about it before, but only today did I witness the sheer colossal project of mechanical products, specifications, and drawings for each one of them. In our engineering studies, we sometimes comes across component names, nomenclatures and so forth that we might never have seen or heard before. Where do we go? Its a nice thing to have a website at your side, no popups, absolutely clean and efficient and all you have to do is punch in the name of the product in the search box. You can then go ahead and order some samples for free to try them for your project, because Mcmaster knows that you'll eventually buy 10,000 units of that from them if that's what you're looking for. So along the way, you get tons of freebies. But in the end, its a marvellous reference tool for mechanical engineers and students.