7315.12.00.20 - Of not over 50 mm pitch and containing more than 3 parts per pitch

This HTS classification, 7315.12.00.20, pertains to specific types of articulated link chains and their parts, manufactured from iron or steel. The defining characteristic of chains falling under this subheading is their construction: they must have a pitch (the distance between the centers of adjacent pins or rollers) not exceeding 50 millimeters, and each pitch segment must incorporate more than three distinct parts. These are typically specialized chains used in industrial machinery, conveyor systems, or other applications requiring precise movement and durability, where the intricate construction contributes to specific functional requirements.

This category is distinct from its sibling categories within the "Other chain" subheading by its precise dimensional and structural criteria. While other "Other chain" categories might encompass a broader range of articulated link chains without these specific limitations, 7315.12.00.20 is reserved for those chains that meet both the maximum pitch requirement and the minimum part count per pitch. This specificity ensures accurate classification of highly engineered chain components.

As this is a leaf node within the HTS structure, there are no further subcategories to introduce. Therefore, classification decisions at this level will rely heavily on the precise interpretation of "pitch" and the count of individual components within each pitch segment. Importers and exporters should carefully examine the physical characteristics of their iron or steel chains to confirm they meet these specific technical requirements to ensure correct customs declaration.