U.S. imports of Large-Diameter Welded Iron & Steel Tubes & Pipes (NES, OD Over 406.4 mm) (SITC 67933) totaled $7.2M in August 2026, imported from 14 countries.
Importers of Large-Diameter Welded Iron & Steel Tubes & Pipes (NES, OD Over 406.4 mm) paid $2.9M in duties in August 2026, an average duty rate of 40.37% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataWelded iron and steel tubes and pipes with an external diameter exceeding 406.4 mm that are not classified as line pipe or OCTG fall into this residual large-diameter category, covering structural piling, water transmission, and industrial pressure applications. The NES designation requires importers to confirm that the product's end-use and specifications do not align with the dedicated line pipe or casing subheadings before using this classification. Section 232 tariff measures apply, and the large-diameter threshold of 406.4 mm is a hard dimensional boundary that should be verified against the mill's dimensional report.
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170 import shipments a month
Products such as structural piling, water-main pipe, and industrial pressure vessels that exceed 406.4 mm OD but are not manufactured or certified to API 5L line pipe standards typically fall here. The absence of a pipeline-service certification or the presence of a structural or water-service specification is often the distinguishing factor.
The threshold applies to the external diameter. Importers should confirm the OD measurement on the mill certificate, as wall thickness variations can cause confusion. A product with an OD at or below 406.4 mm would fall under a different, smaller-diameter subheading even if its internal diameter is close to the threshold.
Basic heading 372 of 766 in section 6
Basic heading 67933 · $7.2M of $27.0B
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Imports · August 2026
origin
South Korea and Germany together supply 70% of it. South Korea pays 50.0% duty; India 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$7.2MYoY · free account
Exports
$6.5MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $100.7M of Large-Diameter Welded Iron & Steel Tubes & Pipes (NES, OD Over 406.4 mm) and exported $58.3M.
Through August 2026. Source: U.S. Census Bureau.