8420.99 - Other:

This category, HTS 8420.99, encompasses "Other" parts for calendering or other rolling machines, excluding those for metals or glass, and their associated cylinders. Following the broader classification of Chapter 84 and Section XVI, these are components that, while not cylinders themselves, are integral to the operation of these specialized rolling and calendering machinery used in various industries beyond metalworking or glass manufacturing.

Unlike its sibling category, 8420.91, which specifically addresses the cylinders used in these machines, HTS 8420.99 covers all other essential components. This can include a wide array of parts such as frames, rollers (other than the main cylinders), bearings, drive mechanisms, control panels, and any other structural or functional elements that are not classified as cylinders but are specifically designed for use with calendering or rolling machines covered under 8420.

The subcategories within 8420.99 provide further refinement based on the intended application of the machinery. The subcategories for "Of machines for processing textiles" and "Of machines for making paper pulp, paper or paperboard" highlight that the ultimate use of these parts is a key determinant in their classification. The residual "Other" subcategory is reserved for parts of calendering or rolling machines used in applications not specifically listed, ensuring a comprehensive classification of all related components.