NAICS 331210 is the six-digit production code for facilities that manufacture iron and steel pipe and tube from purchased steel inputs, covering both welded and seamless product forms across a wide range of diameters and wall thicknesses. Oil country tubular goods, standard pipe, line pipe, and mechanical tubing all fall within this classification, each subject to potentially distinct antidumping and countervailing duty orders depending on origin and specification. The code is frequently cited in ITC domestic industry analyses and Commerce Department scope inquiries because the pipe and tube sector has been one of the most active arenas for US trade remedy petitions over the past two decades. Specification accuracy — grade, seam type, end finish, and dimensional tolerances — is essential for correct HTS entry and trade remedy compliance.

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