7307.92 - Threaded elbows, bends and sleeves:

This category, HTS 7307.92, specifically classifies threaded elbows, bends, and sleeves manufactured from iron or steel. These fittings are characterized by their threaded connections, which are designed for joining pipes or tubes in fluid or gas distribution systems. The threaded nature is a key defining feature for classification within this subcategory, distinguishing them from fittings connected by other methods.

Within the broader "Other" category for tube or pipe fittings of iron or steel (7307.9), HTS 7307.92 is differentiated from its siblings by its specific connection type. Unlike flanges (7307.91), which are typically used for bolting two pipe ends together, or butt welding fittings (7307.93), which are designed for welding directly to the pipe, this category is reserved for threaded components. The "Other" category at the 7307.99 level serves as a residual catch-all for fittings not otherwise specified.

The subcategories within HTS 7307.92 further refine the classification based on the specific type of threaded fitting. HTS 7307.92.30 covers threaded sleeves, often referred to as couplings, which are used to join two pipes of the same or different diameters. HTS 7307.92.90.00 encompasses all other threaded elbows and bends that do not fall under the specific "sleeves" designation, completing the classification for threaded iron and steel pipe fittings.