4016.93.50.10 - O-Rings

This HTS subheading, 4016.93.50.10, specifically classifies O-rings made from vulcanized rubber, excluding hard rubber. O-rings are typically ring-shaped seals with a circular cross-section. They function by being placed in grooves and compressed during assembly, creating a seal between mating parts in static or dynamic applications, commonly found in hydraulic and pneumatic systems, automotive components, and industrial machinery.

Distinguishing this category from its siblings is crucial for accurate classification. While 4016.93.50.20 covers "Oil seals," which are specialized gaskets designed to prevent the leakage of oil or grease, and 4016.93.50.50 encompasses all other types of gaskets, washers, and seals not specifically enumerated, this subheading is solely dedicated to the general classification of O-rings. The primary differentiator lies in the specific form factor and common application of O-rings, which are distinct from the broader categories of oil seals and other miscellaneous sealing components.

As this is a leaf node within the HTS classification, there are no further subcategories to introduce. Therefore, classification under 4016.93.50.10 hinges on the product being a vulcanized rubber ring with a circular cross-section, intended for sealing purposes, and not falling under the more specific "oil seals" designation or other residual "other" sealing articles. The key classification criteria are the material (vulcanized rubber), form (ring with circular cross-section), and function (sealing).