7304.29.61.60 - Having an outside diameter of 215.9 mm or more but not exceeding 406.4 mm

This HTS classification covers seamless tubes and pipes made of iron or steel that are specifically designed for use in drilling for oil or gas. Within the broader category of "Other alloy steel" tubing for oil and gas drilling, this specific subheading applies to items that have a substantial outer diameter, ranging from 215.9 millimeters up to and including 406.4 millimeters. These dimensions suggest applications requiring robust structural integrity and significant fluid or gas flow capacity in demanding drilling environments.

The key distinguishing factor for this category is its defined range of outer diameters. It differs from its siblings by excluding tubing with diameters less than 215.9 mm (covered by 7304.29.61.45) and also tubing with diameters exceeding 406.4 mm (covered by 7304.29.61.75). Therefore, precise measurement of the outside diameter is critical for accurate classification under this subheading.

As this is a leaf node in the HTS structure, there are no further subcategories. Classification decisions at this level are finalized based on the material (alloy steel), application (oil and gas drilling), construction (seamless), and the specified outer diameter range. Examples of products that would fall here include large-diameter production tubing or casing used in wells where substantial volumes of hydrocarbons are extracted.