7303.00.00.90—Tubes, pipes and hollow profiles, of cast iron, other
General
Free
Units
kg
Column 2
33%
Special
—
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Plain-English explanation
HTS 7303.00.00.90 is the U.S. Harmonized Tariff Schedule classification for Tubes, pipes and hollow profiles, of cast iron, other. It's a 10-digit statistical line in Chapter 73: Articles of iron or steel, Section XV: Base Metals and Articles of Base Metal, used by U.S. Customs and Border Protection to determine the duty rate at entry. 8 Chapter 99 tariff modifications currently stack on top of the base rate.
New to HTS codes? Read our guide on how HTS classification works →
Tariff modifications(8)
Chapter 99 overlays that stack on the base rate
| Code | Authority | Rate |
|---|---|---|
| 9903.80.01 | section_232 | The duty provided in the applicable subheading + 25% |
| 9903.80.61 | section_232 | The duty provided in the applicable subheading + 25% |
| 9903.81.83 | section_232 | The duty provided in the applicable subheading + 25% |
| 9903.81.85 | section_232 | The duty provided in the applicable subheading + 25% |
| 9903.81.87 | section_232 | The duty provided in the applicable subheading + 50%. |
| 9903.81.88 | section_232 | The duty provided in the applicable subheading + 50%. |
| 9903.81.94 | section_232 | The duty provided in the applicable subheading + 25% |
| 9903.81.95 | section_232 | The duty provided in the applicable subheading + 25% |
Recent CBP rulings(3)
Past CBP decisions classifying real products under this HTS code. Useful precedent when classifying a similar product — each ruling shows how CBP interpreted the code for a specific case.
The tariff classification of ductile cast iron tubular poles from Turkey.
The tariff classification of cast iron cylinder sleeves from Portugal.
The tariff classification of cast iron cylinder sleeves from Poland.
Source: CBP CROSS (view all rulings on rulings.cbp.gov →)
Frequently asked questions
What is HTS code 7303.00.00.90?
HTS 7303.00.00.90 is the U.S. Harmonized Tariff Schedule classification for Tubes, pipes and hollow profiles, of cast iron, other. It belongs to Chapter 73 of the HTSUS.
What is the general duty rate for HTS 7303.00.00.90?
The general (Column 1) duty rate for HTS 7303.00.00.90 is Free. This is the most-favored-nation (MFN) rate that applies to imports from World Trade Organization member countries.
What is the Column 2 (statutory) rate for HTS 7303.00.00.90?
The Column 2 rate for HTS 7303.00.00.90 is 33%. This rate applies to imports from countries that do not have normal trade relations with the United States (currently Cuba and North Korea).
Are there Section 301 or Section 232 tariffs on HTS 7303.00.00.90?
Yes — HTS 7303.00.00.90 is covered by section_232 provision 9903.80.01 (The duty provided in the applicable subheading + 25%). 7 additional overlays also touch this code. Open the code page for the full overlay stack with effective dates and country scopes.
Does HTS 7303.00.00.90 have any antidumping or countervailing duty (AD/CVD) orders?
No active AD/CVD orders currently flag HTS 7303.00.00.90 in Tandom's catalog. Tandom monitors Federal Register notices daily; a flag will appear here within 24h of any new order's publication.
Relevant notes(2)
Section and chapter notes that govern this code
Classification of Composite Articles
Throughout this schedule, the expression 'base metals' means: iron and steel, copper, nickel, aluminum, lead, zinc, tin, tungsten (wolfram), molybdenum, tantalum, magnesium, cobalt, bismuth, cadmium, titanium, zirconium, antimony, manganese, beryllium, chromium, germanium, vanadium, gallium, hafnium, indium, niobium (columbium), rhenium, and thallium.
Scope of Chapter 73
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.
Learn more
Tandom guides relevant to this code
Section 232 steel, aluminum, and copper duties in 2026
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How Chapter 99 tariff layers stack on a single entry
How to read, order, and report Chapter 99 HTS codes alongside the base classification on a US entry summary in 2026. The full stacking ladder for brokers and compliance teams.
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Drop the Tandom Duty Calculator API into a TMS, broker software, or in-house ERP. Code samples, the response shape, and ACE reporting order, in 2026.
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Section 301 China tariff exclusions in 2026
What the 178 active Section 301 exclusions cover, how to claim 9903.88.69 on an entry, and what changes when the November 10, 2026 deadline passes.
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