Threaded or coupled

This code covers seamless tubes and pipes of alloy steel, specifically casing used in oil and gas drilling, that are threaded or coupled. Use this code when importing these specialized steel pipes, noting they generally enter the U.S. duty-free, as detailed in Chapter 73.

Detailed information for HTS Code 7304.29.31

This tariff code falls within Chapter 73, which covers articles of iron or steel. Specifically, code 7304.29.31 covers seamless tubes and pipes used for oil or gas drilling, made of alloy steel and featuring threaded or coupled casing. Several subdivisions exist within this code, distinguished by outside diameter (ranging from under 215.9mm to over 406.4mm) and wall thickness (under or at/above 12.7mm), so choose the statistical suffix that accurately reflects these dimensions of the specific casing being classified. These detailed subdivisions allow for precise categorization based on the physical characteristics of the casing.

Chapter	Chapter 73 - Articles of iron or steel
Section	Section XV - Base Metals and Articles of Base Metal

Duty snapshot

Quick reference for the duty outcomes tied to this HTS line.

General Duty

Free

Standard trade partners (NTR)

Special Duty

N/A

Eligible FTA or preference programs

The general duty rate for HTS code 7304.29.31 and all its subdivisions is Free, meaning no duty is assessed on goods falling under this code. A special rate is not specified. Goods are to be reported in kilograms (kg). The "general_helper" designation of "Standard trade partners (NTR)" indicates that standard trade relations apply with most countries, while the "special_helper" designation of “Eligible FTA or preference programs” suggests reduced or eliminated duties may be available for goods originating from countries with which the U.S. has free trade agreements or other preference programs, assuming the goods meet the rules of origin requirements. This applies to all subdivisions including 7304.29.31.10 through 7304.29.31.80.

Rate of Duty (Column 2): 28%

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Code subdivisions

7304.29.31.10

Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Casing, tubing and drill pipe, of a kind used in drilling for oil or gas: > Other: > Casing: > Of other alloy steel: > Threaded or coupled > Having an outside diameter less than 215.9 mm: > Having a wall thickness less than 12.7 mm

7304.29.31.20

Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Casing, tubing and drill pipe, of a kind used in drilling for oil or gas: > Other: > Casing: > Of other alloy steel: > Threaded or coupled > Having an outside diameter less than 215.9 mm: > Having a wall thickness of 12.7 mm or more

7304.29.31.30

Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Casing, tubing and drill pipe, of a kind used in drilling for oil or gas: > Other: > Casing: > Of other alloy steel: > Threaded or coupled > Having an outside diameter of 215.9 mm or more but not exceeding 285.8 mm: > Having a wall thickness less than 12.7 mm

7304.29.31.40

Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Casing, tubing and drill pipe, of a kind used in drilling for oil or gas: > Other: > Casing: > Of other alloy steel: > Threaded or coupled > Having an outside diameter of 215.9 mm or more but not exceeding 285.8 mm: > Having a wall thickness of 12.7 mm or more

7304.29.31.50

Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Casing, tubing and drill pipe, of a kind used in drilling for oil or gas: > Other: > Casing: > Of other alloy steel: > Threaded or coupled > Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm: > Having a wall thickness less than 12.7 mm

7304.29.31.60

Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Casing, tubing and drill pipe, of a kind used in drilling for oil or gas: > Other: > Casing: > Of other alloy steel: > Threaded or coupled > Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm: > Having a wall thickness of 12.7 mm or more

7304.29.31.80

Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Casing, tubing and drill pipe, of a kind used in drilling for oil or gas: > Other: > Casing: > Of other alloy steel: > Threaded or coupled > Having an outside diameter exceeding 406.4 mm

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Chapter & section notes

Chapter notes

Harmonized Tariff Schedule of the United States Revision 29 (2025) Annotated for Statistical Reporting Purposes CHAPTER 73 ARTICLES OF IRON OR STEEL XV 73-1 Notes 1. In this chapter the expression "cast iron" applies to products obtained by casting in which iron predominates by weight over each of the other elements and which do not comply with the chemical composition of steel as defined in Note 1(d) to chapter 72. 2. In this chapter the word "wire" means hot- or cold-formed products of any cross-sectional shape, of which no cross-sectional dimension exceeds 16 mm. Additional U.S. Notes 1. For the purposes of heading 7304 or 7306, the rate of duty "Free (C)" appearing in the "Special" subcolumn applies only to tubes and pipes with attached fittings, suitable for conducting gases or liquids. 2. For the purposes of subheading 7307.19.30, the expression "ductile fittings" refers to fittings which contain over 2.5 percent carbon and over 0.02 percent of magnesium or of magnesium and cerium, by weight. Statistical Note 1. For the purposes of statistical reporting numbers 7310.10.0005, 7310.29.0020 and 7310.29.0055, “refillable stainless steel kegs, whether or not pressurized” refers to cylindrical kegs for liquid beverages, each keg with a domed top and bottom and a single neck piece, designed for a coupler (valve) system and an extractor tube (spear) by which the keg can be cleaned, filled and dispense the liquid contents. Harmonized Tariff Schedule of the United States Revision 29 (2025) Annotated for Statistical Reporting Purposes XV 73-2

Section notes

SECTION XV BASE METALS AND ARTICLES OF BASE METAL XV-1 Notes 1. This section does not cover: (a) Prepared paints, inks or other products with a basis of metallic flakes or powder (headings 3207 to 3210, 3212, 3213 or 3215); (b) Ferrocerium or other pyrophoric alloys (heading 3606); (c) Headgear or parts thereof of heading 6506 or 6507; (d) Umbrella frames or other articles of heading 6603; (e) Goods of

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November 15, 2025

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