OD, or Outside Diameter, refers to the diameter of the outer edge of an object or device, that is, the diameter from one edge of the object or device to the other. It is often used to describe the external dimensions of an object or device such as pipes, fittings, bearings, cylinders, etc.
On the other hand, ID, or inside diameter, refers to the diameter of the inner hole of an object or device, that is, the maximum diameter that can accommodate other objects inside the object or device. The inside diameter is often used to describe the internal dimensions of an object or device such as pipes, fittings, bearings, cylinders, etc.
Therefore, OD refers to the outer diameter, not the inner diameter. When using the term OD, we should be clear that what it means is to describe the outer diameter of an object or device, not its inner diameter. In the field of mechanical engineering and machining, the outer diameter is a very important parameter because it determines the size and shape of an object or device, as well as the design and installation of other components associated with it. Therefore, it is important to use the term OD correctly and understand its meaning in drawing annotations, technical specifications, and manufacturing processes.
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