When a person looks at a screw or bolt, he sees only a small element that can be used to fasten any objects. However, he does not notice a huge number of details that will be very important for a professional. Take at least the diameter of the thread — for the average person there is practically no difference whether it will be an inch thread, or there will be an inch with a quarter. For domestic situations, bolts and nuts are most often selected simply by eye so that they are not too large or too small. But if you look at things through the eyes of a specialist who makes such products or works with it constantly, then this quarter of an inch can be determined. In the manufacture of various items in which fasteners are used, the accuracy is very important, so inch carvings on the bolt where only three quarters are needed can be critical.
Wood thread classification: which method to choose
