7306.29.31.00 - Threaded or coupled

This HTS category, 7306.29.31.00, specifically covers threaded or coupled casing pipes of iron or steel that are used in drilling operations for oil or gas. The "threaded or coupled" designation signifies that these pipes are manufactured with specialized end connections, allowing them to be screwed together or joined using couplings for the construction of oil and gas wells. This method ensures secure and pressure-tight connections essential for the integrity of the drilling infrastructure.

Distinguishing this category from its sibling, 7306.29.41.00 ("Other"), is crucial. While the sibling category would encompass casing pipes that are not threaded or coupled, this subcategory is precisely defined by its mechanical connection features. This distinction is based on the method of assembly, where threaded or coupled pipes are designed for specific joining techniques to create a continuous column within a wellbore.

As a leaf node, this classification does not have further subcategories. Therefore, the focus is on the precise application and manufacturing characteristic. Examples of goods falling under this code include casing pipes with integral threads or those supplied with separate couplings, all intended for the demanding environment of oil and gas exploration and extraction where robust and sealed pipe joints are paramount.