HS Code 84.84 – Gaskets and similar joints of metal sheeting combined with other material or of two or more layers of metal; sets or assortments of gaskets and similar joints, dissimilar in composition, put up in pouches, envelopes or similar packings; mechanical seals

HS code 8484 is a 4-digit heading in the Harmonized System that covers: Gaskets and similar joints of metal sheeting combined with other material or of two or more layers of metal; sets or assortments of gaskets and similar joints, dissimilar in composition, put up in pouches, envelopes or similar packings; mechanical seals. HS Heading 8484 is dedicated to gaskets and similar joints made of metal sheeting combined with other materials, or of two or more layers of metal, along with sets or assortments of dissimilar gaskets, and mechanical seals. This classification is incredibly important for international trade as these components are absolutely critical for preventing leakage, maintaining pressure, and ensuring the operational integrity of virtually all mechanical systems, from engines and pumps to industrial pipelines and chemical reactors. The scope specifically covers composite gaskets and dynamic mechanical seals, distinguishing them from simpler, single-material gaskets. Key sub-categories include multi-layer steel (MLS) gaskets for engines, spiral wound gaskets for high-pressure applications, and various types of mechanical face seals. As part of Section XVI (Machinery and Mechanical Appliances), it underscores their role as essential parts for machinery. Accurate classification is crucial for trade compliance, ensuring proper tariff assessment, and adherence to specific industry standards (e.g., for automotive, oil & gas, or aerospace applications). The trade in these items reflects global industrial activity and the continuous need for reliable sealing solutions in advanced engineering.

Cylinder head gaskets (multi-layer steel), exhaust manifold gaskets, spiral wound gaskets, corrugated metal gaskets, jacketed gaskets, metal-reinforced graphite gaskets, metal-clad gaskets, ring joint gaskets, heat exchanger gaskets (metal with non-metal insert), gasket sets for engine overhaul, mechanical face seals, cartridge seals, component seals, pump seals, compressor seals, valve stem seals (complex type), flange gaskets (metal-composite), fuel injector seals (metal-composite), turbocharger gaskets, exhaust pipe seals, transmission pan gaskets (metal-composite), metal-rubber bonded gaskets, metal-PTFE gaskets.

Common misclassifications arise when traders confuse the specific scope of 8484 with simpler gaskets made solely of non-metallic materials. For instance, plain rubber gaskets typically fall under 4016, and plastic gaskets under 3926. 8484 is specific to gaskets of 'metal sheeting combined with other material' or 'two or more layers of metal,' and mechanical seals. Simple O-rings are generally classified under 4016. Another error is classifying individual components of a mechanical seal (e.g., a simple spring or a rubber secondary seal) separately, rather than as part of the complete seal assembly under 8484.

In 2025, the top exporters of HS code 8484 in UN Comtrade data were Germany ($1.8B, 20% of world exports), the United States ($1.3B) and China ($828M). World exports came to about $9.2B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

In 2025, the top importers of HS code 8484 in UN Comtrade data were China ($873M, 9.0% of world imports), the United States ($847M) and Germany ($641M). World imports came to about $9.7B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

HS code 8484 is a 4-digit heading under Chapter 84 of the Harmonized System. The first 2 digits (84) identify the chapter, and digits 3-4 (84) specify the heading. This code contains multiple 6-digit subheadings for precise product classification.