9031.90.45.00 - Bases and frames for the coordinate-measuring machines of subheading 9031.49.40

This HTS category, 9031.90.45.00, specifically covers bases and frames designed for coordinate-measuring machines that fall under subheading 9031.49.40. These are essential structural components providing the foundational support and framework upon which the intricate measuring mechanisms of these machines are mounted and operate. The classification emphasizes the dedicated purpose of these bases and frames as integral parts of a particular type of optical measuring equipment.

To distinguish this category from its siblings, it's important to note that 9031.90.54.00 covers parts and accessories for other optical instruments and appliances, specifically those within subheadings 9031.41 or 9031.49.70. Therefore, the key differentiator here is the direct association with coordinate-measuring machines classified under 9031.49.40. Category 9031.90.59.00 acts as a residual category for any other unspecified parts and accessories within the broader scope of optical instruments and appliances.

As this classification represents a leaf node, there are no further subcategories. Classification within 9031.90.45.00 is therefore determined by the specific design and intended use of the base or frame, ensuring it is solely manufactured or primarily intended for use with the coordinate-measuring machines referenced in the parent subheading. The focus remains on the structural integrity and functional role these components play in supporting the precision measurement apparatus.