8483.20 - Housed bearings, incorporating ball or roller bearings:

This HTS category, 8483.20, specifically covers housed bearings that are designed to incorporate ball or roller bearings as their primary anti-friction element. These assemblies are pre-packaged units where the bearing is enclosed within a housing, providing protection from contamination and simplifying mounting. They are intended to reduce friction and transmit rotational motion, often in demanding industrial environments.

It is important to distinguish 8483.20 from its sibling categories. While 8483.10 covers transmission shafts and cranks, and 8483.30 deals with bearing housings and plain shaft bearings (which lack rolling elements), 8483.20 is exclusively for units that integrate ball or roller bearings. Other siblings in Heading 8483 cover gears, screws, flywheels, pulleys, and clutches, each representing distinct mechanical components.

The subcategories within 8483.20 provide further refinement based on the specific type of housed unit. 8483.20.40 encompasses common pre-assembled configurations such as flange, take-up, cartridge, and hanger units, often found in power transmission systems. The residual category, 8483.20.80, covers all other housed ball or roller bearing units not falling into the more specific subcategories, ensuring comprehensive coverage for this type of mechanical component.