4016.93 - Gaskets, washers and other seals:

This HTS category, 4016.93, specifically covers gaskets, washers, and other seals manufactured from vulcanized rubber, excluding hard rubber. These items are designed to prevent leakage or maintain a seal between components in various mechanical systems and assemblies. Examples include O-rings, oil seals, and various types of sealing rings and strips, provided they are not specifically classified elsewhere under Chapter 40.

Within the broader group of "Other articles of vulcanized rubber other than hard rubber," this heading distinguishes itself from sibling categories like floor coverings (4016.91), erasers (4016.92), boat fenders (4016.94), and other inflatable articles (4016.95). While all are made of vulcanized rubber, the defining characteristic of 4016.93 is their function as sealing components.

The subcategories within 4016.93 further refine classification based on the intended application. Subcategory 4016.93.10 is designated for gaskets, washers, and seals specifically designed for use in automotive goods classified under Chapter 87. All other rubber seals not falling into this automotive-specific category are classified under 4016.93.50. This distinction allows for specific trade data collection and potential duty rate application based on end-use.