7507 - Nickel tubes, pipes and tube or pipe fittings (for example, couplings, elbows, sleeves):

This HTS category, 7507, encompasses finished articles made from nickel in the form of tubes, pipes, and fittings. This includes a variety of hollow nickel products designed for conveying fluids or gases, as well as connectors and accessories used to join these tubes and pipes. The classification is specifically for nickel items, excluding those made from nickel alloys unless nickel is the predominant metal by weight and the article falls within the scope of Chapter 75.

Distinct from other categories within Section XV, which covers a broad spectrum of base metals and their articles, HTS 7507 is exclusively focused on nickel's tubular and fitting forms. While other chapters might classify metal tubes and pipes of different materials (e.g., iron, copper), or nickel in other forms like wire or sheets, this chapter zeroes in on the specific applications and constructions of nickel in these tubular configurations. It's important to note that unfinished nickel materials, such as nickel ingots or powders, would be classified elsewhere.

Within HTS 7507, further distinctions are made to accommodate different types of nickel tubular goods. The subcategories differentiate between the tubes and pipes themselves, and the specialized fittings used to create complete plumbing or conduit systems. This hierarchical structure allows for precise classification based on whether the item is a primary conduit (tube or pipe) or a component designed to alter the direction, size, or connection of such conduits.