Key facts
- HS code
- 7307.91
- Covers
- Flanges
- Edition
- HS2022
- Duty in the United States
- See its 6 lines
Summary
HS code 7307.91 covers flanges, other than those classified in 7307.21, 7307.22, 7307.23, 7307.29, 7307.92, 7307.93 and 7307.99. It sits in heading 73.07 (tube or pipe fittings (for example, couplings, elbows, sleeves), of iron or steel) in chapter 73 (articles of iron or steel). Other goods of heading 73.07 are classified under 7307.11 (cast fittings, of non-malleable cast iron), 7307.19 (cast fittings, other), 7307.21 (other, of stainless steel, flanges), 7307.22 (other, of stainless steel, threaded elbows, bends or sleeves) and 5 others. National tariff lines under 7307.91 are live on border.bot for the United States (6 lines, also used by 1 other country).
What this code covers
HS code 7307.91 covers flanges, other than those classified in 7307.21, 7307.22, 7307.23, 7307.29, 7307.92, 7307.93 and 7307.99.
The legal text of the subheading is “Other: Flanges”, read under “Other”, in HS2022.
What it doesn’t cover
Other goods of heading 73.07 are classified under 7307.11 (cast fittings, of non-malleable cast iron), 7307.19 (cast fittings, other), 7307.21 (other, of stainless steel, flanges), 7307.22 (other, of stainless steel, threaded elbows, bends or sleeves) and 5 others.
- 7307.11Cast fittings: Of non-malleable cast iron
- 7307.19Cast fittings: Other
- 7307.21Other, of stainless steel: Flanges
- 7307.22Other, of stainless steel: Threaded elbows, bends and sleeves
- 7307.23Other, of stainless steel: Butt welding fittings
- 7307.29Other, of stainless steel: Other
- 7307.92Other: Threaded elbows, bends and sleeves
- 7307.93Other: Butt welding fittings
- 7307.99Other: Other
How it is structured
7307.91 is a six-digit subheading. Its first two digits, 73, are the chapter; the first four, 7307, are heading 73.07; the last two, 91, identify the subheading within the heading.
Countries add their own digits after these six for their national tariff lines.
- Chapter 73
- Articles of iron or steel
- Within the heading
- Other
- Subheading 7307.91
- Flanges
In other countries
National tariff lines under 7307.91 are live on border.bot for the United States (6 lines, also used by 1 other country).
- United States6 lines, used by 1 other country
Frequently asked questions
What does HS code 7307.91 cover?
HS code 7307.91 covers flanges, other than those classified in 7307.21, 7307.22, 7307.23, 7307.29, 7307.92, 7307.93 and 7307.99.
Which heading and chapter is HS code 7307.91 in?
HS code 7307.91 is in heading 73.07 (tube or pipe fittings (for example, couplings, elbows, sleeves), of iron or steel) in chapter 73 (articles of iron or steel).
Where are goods of heading 73.07 classified when 7307.91 doesn’t fit?
Other goods of heading 73.07 are classified under 7307.11 (cast fittings, of non-malleable cast iron), 7307.19 (cast fittings, other), 7307.21 (other, of stainless steel, flanges), 7307.22 (other, of stainless steel, threaded elbows, bends or sleeves) and 5 others.
Which countries’ tariffs list national lines under HS code 7307.91?
National tariff lines under 7307.91 are live on border.bot for the United States (6 lines, also used by 1 other country).
Sources and updates
The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026.
This page was last updated on 11 October 2026.
Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.