8487.90.00.40 - Oil seals, other than those of chapter 40

HTS Code 8487.90.00.40 specifically classifies "oil seals, other than those of chapter 40." This category encompasses sealing devices designed to prevent the leakage of oil or other lubricants, commonly found in machinery. These seals are typically made from materials like rubber, plastic, or metal composites, and their primary function is to maintain the integrity of machinery by containing lubricants and excluding contaminants. The exclusion of "those of chapter 40" is crucial, meaning that oil seals composed primarily of vulcanized rubber or synthetic rubbers that fall under Chapter 40 are classified elsewhere.

At this level, the distinction is made based on the specific function and material composition of the sealing element. While other "parts of machinery, not elsewhere specified or included" exist, this code is dedicated to the specialized function of oil sealing in mechanical systems. It's important to note that while the general heading 8487 covers various machinery parts not specified elsewhere, this subheading refines that classification to identify a specific, common component.

As a leaf node, HTS Code 8487.90.00.40 does not have further subcategories. Classification under this code relies on fulfilling the definition of an oil seal and ensuring it is not primarily classifiable under Chapter 40. Therefore, careful consideration of the material composition and intended use is paramount for accurate classification.