Scope determinations for pipe and tube antidumping orders depend on precise physical specifications — outside diameter range, wall thickness, steel grade, and whether the product is welded or seamless — as well as the country of origin. Importers should request a formal scope ruling from the Department of Commerce when a product's classification is ambiguous, and should consult a licensed customs broker or trade attorney before entry.

Oil country tubular goods are specifically designed for drilling, casing, and production operations in oil and gas wells and must meet API or equivalent specifications for pressure rating and connection type. Standard structural tubing is sized and graded for load-bearing construction applications. The distinction matters because separate antidumping orders often cover OCTG and line pipe independently from structural tube, and misclassification can result in incorrect duty deposits.