Other

This code covers iron or steel tube and pipe flanges with varying diameters and material compositions (iron/nonalloy steel or alloy steel). Use this code when classifying these fittings to determine the applicable duty rate—typically 5.50% for general imports, with reduced or free rates for goods from certain countries or those eligible for trade preference programs, as detailed within Chapter 73.

HTS media

This tariff classification falls within Chapter 73, which covers articles of iron or steel. Specifically, the code 7307.91.50 covers other tube or pipe fittings, like couplings and elbows, made of iron or steel, and further defined as flanges, other than those specifically listed elsewhere. This code has subdivisions based on both the inside diameter of the flange (less than or greater than 360 mm) and the material it’s made of (iron/nonalloy steel or alloy steel, excluding stainless steel); use the appropriate statistical suffix (.10, .30, .50, or .70) based on these two characteristics. Remember to select the correct suffix that matches both the diameter and material composition of the flange being classified.

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

Duty Snapshot

Quick view of the available duty information for this HTS code.

General Duty

5.50%

Standard trade partners (NTR)

Special Duty

Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 2.75% (JP)

Eligible FTA or preference programs

The general duty rate for HTS code 7307.91.50 and its subdivisions is 5.50% applying to goods reported in kilograms. Special rates exist for certain countries: Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG), 2.75% for Japan (JP), and rates are available through Eligible FTA or preference programs. These special rates apply to the same subdivisions (7307.91.50.10, 7307.91.50.30, 7307.91.50.50, and 7307.91.50.70) based on the country of origin and any applicable trade agreements or programs. Section information is not specified.

Rate of Duty (Column 2): 45%

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Code Subdivisions

7307.91.50.10

Tube or pipe fittings (for example, couplings, elbows, sleeves), of iron or steel: > Other: > Flanges: > Other > With an inside diameter of less than 360 mm: > Of iron or nonalloy steel

7307.91.50.30

Tube or pipe fittings (for example, couplings, elbows, sleeves), of iron or steel: > Other: > Flanges: > Other > With an inside diameter of less than 360 mm: > Of alloy steel (except stainless steel)

7307.91.50.50

Tube or pipe fittings (for example, couplings, elbows, sleeves), of iron or steel: > Other: > Flanges: > Other > With an inside diameter of 360 mm or more: > Of iron or nonalloy steel

7307.91.50.70

Tube or pipe fittings (for example, couplings, elbows, sleeves), of iron or steel: > Other: > Flanges: > Other > With an inside diameter of 360 mm or more: > Of alloy steel (except stainless steel)

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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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Last updated

November 15, 2025

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