8452.90 - Furniture, bases and covers for sewing machines, and parts thereof; other parts of sewing machines:

This HTS category, 8452.90, encompasses parts and accessories for sewing machines, excluding the machines themselves and sewing machine needles. Specifically, it covers furniture, bases, and covers that are specially designed to accommodate and support sewing machines. This also includes any components or parts integral to these furniture items.

Distinct from its sibling categories, 8452.90 is not for the sewing machines themselves (8452.10.00 for household types and the unnumbered "other sewing machines" category), nor is it for the sewing machine needles (8452.30.00.00). Instead, it focuses solely on the supporting structures and protective coverings for these machines, as well as general components that are not the machine or its needles.

The subcategories within 8452.90 provide further specificity. 8452.90.10.00 covers the furniture, bases, and covers, and their associated parts. The remaining category, 8452.90.20, is designated for "other parts of sewing machines," acting as a residual category for any components not otherwise classified, such as internal mechanisms, motors, or other functional elements of the sewing machine.