Harmonized System
U.S. exports of Large-Diameter Oil & Gas Drilling Casing, Iron or Steel (Over 16 In.) (HS 730520) totaled $3.0M in August 2026.
Importers of Large-Diameter Oil & Gas Drilling Casing, Iron or Steel (Over 16 In.) paid $653K in duties in August 2026, an average duty rate of 50.00% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Large-Diameter Oil & Gas Drilling Casing, Iron or Steel (Over 16 In.) imports of $1.3M in August 2026 ran 64% below the year-to-date monthly average of $3.6M.
Last updated: August 2026 dataSubject to Section 232 tariffs on steel imports, large-diameter casing with an external diameter exceeding 406.4 mm is a specialized product used in deep and offshore oil and gas well construction where standard OCTG sizes are insufficient. The US schedule subdivides this heading by threading configuration and alloy content, with tariff lines 7305202000 and 7305206000 covering threaded variants in non-alloy and alloy steel respectively, while 7305203000, 7305204000, and 7305207000 address non-seamless circular cross-section and other configurations. The United Kingdom and Brazil are leading suppliers, with South Korea, Japan, and Germany also contributing meaningfully to US import volumes.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
2 import shipments a month
The heading splits primarily by alloy type and threading: 7305202000 covers threaded non-alloy steel casing, 7305206000 covers threaded alloy steel casing, while 7305203000 and 7305207000 address non-seamless circular cross-section variants in non-alloy and alloy steel respectively, and 7305204000 captures remaining configurations not elsewhere specified.
Yes. Iron and steel pipe and tube products, including large-diameter casing, are broadly subject to Section 232 tariffs. Importers should also check for any applicable antidumping or countervailing duty orders specific to the country of origin, as these can apply independently of Section 232 measures.
Trade Directory
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Subheading 2 of 7 in heading 7305
Subheading 730520 · $3.0M of $10.4M
ImportsExports
Imports
$1.3MYoY · free account
Exports
$3.0MYoY · free account
Low of 11 reported months · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $40.6M of Large-Diameter Oil & Gas Drilling Casing, Iron or Steel (Over 16 In.) and exported $26.9M.
Through August 2026 · imports 11 of 12 months reported. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 7305204000 | Casing Oil/Gas Drill Irn/Stl, Diam Gt 406.4mm, NESOI | $1.3M | 50.00% | 100.00% | $653K |
| 7305202000 | Casing Oil/Gas Drillng, I/S, Thread, Gt 406.4mm Di | — | -- | -- | -- |
| 7305206000 | Casing Oil/Gas Drillng Alloy Stl, Thread, Gt 406.4mm | — | -- | -- | -- |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7305207000 | Csng O/G Drl Nt Smls Circ Cs Dia 0406.4mm Aly Stl | $3.0M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Exports · August 2026
destination
Trinidad and Tobago and Nigeria together take 92% of it.
customs district
origin
entry
rate provision · imports
duty collected equals 50.00% of imports for consumption.