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Industrial tools, as well as household appliances such as pipes, screws, and nuts have threads on them. You would have also noticed that pipes have the threads on the insides as well as on the external sides. The screws have the threads on the external sides alone whereas the nuts have them on the insides. They may look like very simple industrial appliances to use. However, a manufacturing company has to check for the tolerance levels of the threaded instruments before passing them fit for industrial and domestic consumption. They have simple means to do so using implements known as the thread gauges.