Threading and tapping machines remove metal to produce internal or external screw threads and are critical inputs for fastener manufacturing, pipe fitting, and precision component production. The NES designation places this heading in a residual category covering machines not elsewhere specified in the SITC schedule, which can create classification ambiguity when a machine performs both threading and other cutting operations. Buyers and importers should document the machine's primary function clearly, as multi-function machine tools may be classified under a different heading depending on their principal purpose.

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