It classifies under heading 8452. The heading for leather and footwear machinery (8453) explicitly excludes sewing machines. A sewing machine's classification follows its design as a sewing machine regardless of the material it sews, so leather-specific industrial sewing machines remain in 8452.

Parts specifically designed for machinery of heading 8453 classify under subheading 845390. General-purpose parts that are not identifiable as belonging to a specific machine type may fall under a broader parts heading. The specificity of the part's design and its suitability for use solely or principally with 8453 machinery is the determining factor.