Coarse is the most common metric thread and, as we've mentioned, coarse is assumed when pitch isn't specified. Fine metric fasteners can be more or less fine, depending on size. Coarse metric fasteners, when compared to standard "inch" fasteners (those commonly used in North America), tend to be less coarse-their threads are more closely spaced-for a comparable size. Metric fasteners are usually classified as either coarse or fine, referring to their thread pitch, although some sizes are available in an extra fine thread. Fastener thread pitch in millimeters and inches. If you need to know the threads per inch of a metric fastener, first convert pitch from millimeters to inches (multiply by 0.03937), then divide 1 by that number. Inch fasteners are described as threads per inch, which is sometimes mistakenly called pitch. In the example above, a pitch of 1.0 means that from one thread to the next thread, the distance is 1.0 millimeter. If you normally work with inch fasteners, pitch can be a little confusing-pitch is the distance between adjacent threads. (To avoid confusion, we always include the thread pitch for both coarse and fine metric fasteners.) M12 x 25 = 12 mm diameter, coarse thread is assumed (1.75 mm), 25 mm long
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