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A hex nut is one of the most popular fasteners, the shape of a hexagon so has six-sides. Hex nuts are made from a number of materials, from steel, stainless steel to nylon. They can fasten a bolt or screw securely through a threaded hole, the threads tend to be right-handed. With six sides it makes it easier to work with, tools such as a spanner, or a ratchet make it very versatile to tighten o...