7409.90.10 - Of a thickness of 5 mm or more

This HTS category, 7409.90.10, specifically classifies plates, sheets, and strip of copper alloys, with a particular emphasis on their physical dimension. The defining characteristic for inclusion here is a thickness of 5 millimeters or more. These are typically forms of copper alloys that have undergone significant rolling or shaping processes, resulting in substantial thickness for industrial or structural applications.

This classification distinguishes itself from its sibling category, 7409.90.00, which covers similar copper alloy plates, sheets, and strip of a thickness *less* than 5 millimeters. The 5 mm threshold is a crucial physical attribute used to differentiate between heavier-duty or structural forms and thinner, more flexible materials within the broader category of copper alloy plates, sheets, and strip.

Within this thick category, further subdivisions exist to account for specific material compositions. Subcategory 7409.90.10.30 is designated for articles made of beryllium copper alloys, a specialized alloy known for its strength and conductivity. All other copper alloy plates, sheets, and strip of 5 mm or greater thickness, not falling under the beryllium copper specification, are classified under the residual category 7409.90.10.60.