8459.31.00 - Numerically controlled

HTS code 8459.31.00 specifically covers other boring-milling machines that are numerically controlled. This means these machines utilize pre-programmed instructions delivered via numerical data to perform their operations, offering high precision and repeatability in metal removal processes such as boring and milling. The "numerically controlled" aspect is the defining characteristic of this subcategory, differentiating it from manual or simpler automated controls.

The sibling category, 8459.39.00, encompasses "other" boring-milling machines that are *not* numerically controlled. This distinction is critical for classification. If a machine performs boring and milling operations but relies on operator input or simpler mechanical automation rather than a digital program, it would fall under the sibling category. The classification hinges on the method of control and automation employed in the machining process.

Within 8459.31.00, further subclassification exists to refine the description. The primary subdivision is "Used or rebuilt" (8459.31.00.05), which specifically categorizes machines that have been previously operated and subsequently refurbished. The existence of an "Other" subcategory indicates that further distinctions may apply within the numerically controlled machines, potentially based on specific functionalities, configurations, or intended applications not captured at the higher level.