7604.21.00 - Hollow profiles

This HTS classification, 7604.21.00, specifically covers hollow profiles made from aluminum alloys. These are typically extruded or drawn products with a uniform cross-sectional shape, featuring one or more internal voids. Examples include aluminum tubing, pipes, and structural components designed for applications where weight reduction and strength are paramount, such as in construction, automotive manufacturing, and aerospace.

This category is distinguished from its sibling, 7604.29, which encompasses "Other" aluminum alloy bars, rods, and profiles that are not hollow. Therefore, the defining characteristic for classification under 7604.21.00 is the presence of at least one internal void throughout the length of the profile.

Further subdivision within this category, as seen in 7604.21.00.10 and 7604.21.00.90, is based on the specific properties and types of aluminum alloys used. Subcategory .10 addresses heat-treatable industrial alloys, as detailed in statistical note 7, implying a focus on alloys that undergo specific heat treatments to achieve enhanced mechanical properties. The residual hollow profiles fall under the "Other" subcategory .90.