If you were to take a look down any aisle filled with fasteners at a home improvement store, you would no doubt find your range of choices overwhelming. Anchors, eye bolts, machine screws, spring nuts, weld screws, and simple wood screws are just a few of the possibilities you have to choose from when looking at fasteners. While it would be impossible to review each of the different fasteners and their use, here are some basics.
When it comes to fasteners, there is one basic starting point: What kind of materials are you looking to fasten together? If the objects are both metal, then you want a fastener with machine threads. That basically means that all of the threads on metallic fasteners will be parallel with the head of the screw or bolt, whatever.
Now the threads on metallic screws or bolts come in two varieties: coarse or fine. Coarse-threaded fasteners will have a wider gap between each thread. And fine-threaded screws, well, have a small or fine gap between each thread. So which should you use? Well, it depends on the nature of the objects being fastened together. If a lot of force will be trying to pull the objects apart, then fine threads work better....
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