7415.33 - Screws, bolts and nuts:

This HTS category, 7415.33, specifically addresses screws and bolts made of copper or copper alloys, excluding those specifically for wood or of Muntz or yellow metal. It encompasses a broad range of threaded fasteners where the head is primarily composed of copper, used for joining materials by means of internal or external threads. The key defining characteristic here is the copper composition of the fastener itself, distinguishing it from fasteners made predominantly of other base metals.

Within the broader heading of "Other threaded articles" under 7415, this subcategory is distinct from its sibling category, 7415.39, which covers all other similar threaded copper articles not otherwise specified. Category 7415.33 is therefore more granular, focusing on the common fasteners of screws and bolts.

This classification further subdivides to provide more precise identification of these copper screws and bolts. Subcategory 7415.33.10.00 covers bolts specifically made of Muntz or yellow metal, indicating a particular copper alloy. The remaining subcategories, 7415.33.05.00 for screws specifically designed for wood, and 7415.33.80 for other types of screws and bolts along with nuts, allow for further detailed classification based on the intended application or specific type of fastener. This segmentation aids in accurate customs reporting and duty assessment.