7307.92.30 - Sleeves (couplings)

This HTS classification, 7307.92.30, specifically designates threaded sleeves, also known as couplings, manufactured from iron or steel. These articles are designed for joining pipes or tubes and are characterized by their internal threading which allows for secure connection. This subcategory falls under "Other" tube or pipe fittings of iron or steel, indicating it is not specifically a flange, elbow, or bend, but rather a fitting that serves a different purpose in pipe systems.

Within the "Other" category for fittings, 7307.92.30 distinguishes itself from its sibling, 7307.92.90.00, by being exclusively for *threaded* sleeves. The sibling category, "Other," likely encompasses unthreaded sleeves or other types of sleeve fittings not specifically covered by the "threaded" designation. The critical differentiating factor is the presence and nature of the threading on the sleeve.

The subcategories beneath 7307.92.30 further refine the classification based on material composition. 7307.92.30.10 covers threaded sleeves made from iron or nonalloy steel, which are the most common types. In contrast, 7307.92.30.30 is reserved for threaded sleeves constructed from alloy steel, specifically excluding stainless steel, acknowledging that different steel alloys can have distinct properties and commercial considerations.