8483.30.40 - Flange, take-up, cartridge and hanger units

HTS code 8483.30.40 encompasses specific types of bearing housings and plain shaft bearings that are designed as integrated units for ease of mounting and alignment. This category includes flange units, which feature a mounting plate with bolt holes for direct attachment to a structure; take-up units, designed to accommodate axial adjustments of shafts; cartridge units, self-contained bearing assemblies that simplify installation and maintenance; and hanger units, typically suspended to support shafts. These components are crucial in mechanical power transmission systems for supporting rotating shafts and reducing friction.

This specific heading distinguishes itself from its sibling, 8483.30.80 (Other), by covering only those bearing housings and plain shaft bearings that are pre-assembled into these functional units. The "Other" category would generally include individual bearing housings, separate plain shaft bearings, or components not forming an integrated mounting solution as described in 8483.30.40. The emphasis here is on the integrated form factor and the specific mounting functionalities provided by flange, take-up, cartridge, and hanger designs.

Further subdivision exists within 8483.30.40 to differentiate based on the type of bearing incorporated. Subcategory 8483.30.40.40 specifically covers units that utilize ball or roller bearings, known for their low friction and ability to handle radial and axial loads. Conversely, 8483.30.40.80, designated as "Other," would encompass integrated bearing units that employ plain shaft bearings, which rely on a sliding surface often lubricated by oil or grease, suitable for applications where precise positioning or high shock loads are not primary concerns.