7304.24.30 - Threaded or coupled

This HTS category, 7304.24.30, specifically covers casing pipes made of stainless steel, intended for use in the oil and gas drilling industry, that are threaded or coupled. These are distinct from other types of casing at this level which would be classified under 7304.24.40 ("Other"). The "threaded or coupled" designation is a key physical characteristic that differentiates these items, indicating they are prepared for connection within a drilling string.

Within this specific classification, further subdivisions are based on the physical dimension of the casing's outside diameter. These subcategories allow for precise classification of casing pipes ranging from those with an outside diameter less than 215.9 mm, to those between 215.9 mm and 285.8 mm, and then to those exceeding 285.8 mm but not exceeding 406.4 mm (7304.24.30.45), and finally, those with an outside diameter exceeding 406.4 mm (7304.24.30.80). This granular breakdown is essential for accurately determining import duties and adhering to regulatory requirements based on the specific size of the oil and gas well casing.