7304.24.60.60 - Having an outside diameter of 215.9 mm or more but not exceeding 406.4 mm

This HTS classification, 7304.24.60.60, specifically designates seamless tubes and pipes made of stainless steel, used in drilling for oil or gas, characterized by having an outside diameter that is 215.9 mm or more, but does not exceed 406.4 mm. These are crucial components for oil and gas extraction operations, requiring precise specifications to ensure operational integrity and safety under demanding subsurface conditions.

This category is distinguished from its siblings primarily by its defined range of outside diameters. Categories with smaller outside diameters (not exceeding 114.3 mm, or exceeding 114.3 mm but less than 215.9 mm) are for different applications or require different manufacturing tolerances. Conversely, this category is distinct from those with outside diameters exceeding 406.4 mm, which are typically used for larger bore wells or specialized heavy-duty applications. The material, being stainless steel, also aligns with the parent category 7304.24 which denotes stainless steel casing, tubing, and drill pipe.

As this node represents a leaf category within the HTS structure, there are no further subcategories. Therefore, the classification is complete at this level, with the determining factor for entry into this specific code being the precise measurement of the outside diameter within the specified range, alongside the material (stainless steel) and the intended use (oil and gas drilling). Items fitting these criteria are definitively classified here.