7411.21 - Of copper-zinc base alloys (brass):

This HTS category, 7411.21, specifically covers tubes and pipes manufactured from copper-zinc base alloys, commonly known as brass. These articles are distinguished by their composition, where zinc is the principal alloying element in copper. The forms and dimensions of these brass tubes and pipes can vary widely, intended for a multitude of industrial, commercial, and domestic applications.

Sibling categories, such as 7411.22, differentiate based on the specific alloying elements present. While 7411.21 is dedicated to brass (copper-zinc), 7411.22 addresses tubes and pipes made from copper-nickel alloys (cupro-nickel) or copper-nickel-zinc alloys (nickel-silver). Category 7411.29, "Other," would encompass brass tubes and pipes not covered by more specific subheadings, should they arise.

Within 7411.21, further classification is provided by subcategories. The distinction lies in the manufacturing method: 7411.21.10.00 covers seamless brass tubes and pipes, which are formed without a welded seam, typically through extrusion or drawing processes. In contrast, 7411.21.50.00 encompasses other types, which would generally include tubes and pipes that have been manufactured with a welded seam.