Product classification
HS code for Cast iron bathtub: 7324.21
Cast iron, baths, whether or not enamelled.
Classification of cast iron bathtub under HS 7324.21
Cast iron bathtubs are classified under HS code 7324.21. This classification is determined by the base material (iron) and the manufacturing method (casting), as well as the intended use as a fixed sanitary fixture. Within Chapter 73, which covers articles of iron or steel, heading 7324 is dedicated to sanitary ware and parts thereof. The subheading 7324.21 specifically isolates baths made of cast iron, whether or not they have been enamelled. Most modern cast iron tubs are finished with a porcelain enamel coating for hygiene and aesthetics, but the underlying structure remains heavy cast iron, which dictates the classification. The high carbon content and the brittle nature of the iron used in the casting process distinguish these items from those made of pressed steel or plastic. Customs authorities prioritize the material composition and the primary function of the item when assigning this code.
- Covers
- Clawfoot cast iron bathtubs
- Built-in enamelled cast iron baths
- Freestanding cast iron soaking tubs
- Pedestal cast iron baths
- Raw (non-enamelled) cast iron bath shells
- Also under 7324.21
- Kohler Bellwether
- American Standard Cambridge
- Victoria + Albert (some cast iron models)
- Cheviot Products
- Signature Hardware (cast iron models)
Codes often confused with 7324.21
Common mistake. The most common misclassification occurs with steel bathtubs, which are classified under HS code 7324.29. Steel tubs are typically made from pressed sheets and are much lighter than cast iron. Another frequent error is classifying plastic or acrylic bathtubs under this code; those belong under HS code 3922.10. Furthermore, if the item is a small basin or sink rather than a full bath, it should be classified under 7324.10 (stainless steel) or 7324.90 (other iron/steel sanitary ware).
Top exporters and importers of HS 732421 (the code used for cast iron bathtub), 2025
In 2025, the largest exporter of HS 732421 (the code used for cast iron bathtub) in UN Comtrade data was China, with 44% of world exports; the largest importer in UN Comtrade data was Saudi Arabia, with 25% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 732421, not only cast iron bathtub.
Top exporters 2025 · share of world exports
- 1 China $13M 44% of world exports
- 2 United Arab Emirates* ~$6.2M 20% of world exports · partner records ↗
- 3 Portugal $2.6M 8.4% of world exports
World total: $30M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Saudi Arabia $9.2M 25% of world imports
- 2 United States $8.2M 22% of world imports
- 3 Russia* ~$3.8M 10% of world imports · partner records ↗
World total: $37M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for cast iron bathtub
Brazil classifies cast iron bathtub under NCM 7324.21.00: HS 7324.21 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about cast iron bathtub
What is the HS code for Cast iron bathtub?
The HS code for Cast iron bathtub is 732421 (Cast iron, baths, whether or not enamelled). The HS code for a cast iron bathtub, whether enamelled or not, is 7324.21. This code is specific to baths made from cast iron material.
How do I classify Cast iron bathtub for customs?
Cast iron bathtub is classified under HS code 732421 — Cast iron, baths, whether or not enamelled. This is a 6-digit subheading level code.
Does the enamel coating change the HS code?
No, HS code 7324.21 covers cast iron baths regardless of whether they are enamelled. The presence of enamel is expected for most household sanitary ware in this category.
Which countries are the top exporters of cast iron bathtub (HS 732421)?
In 2025, the top exporters of HS 732421 (the code used for cast iron bathtub) in UN Comtrade data were China ($13M, 44% of world exports), the United Arab Emirates (about $6.2M) and Portugal ($2.6M). World exports came to about $30M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of cast iron bathtub (HS 732421)?
In 2025, the top importers of HS 732421 (the code used for cast iron bathtub) in UN Comtrade data were Saudi Arabia ($9.2M, 25% of world imports), the United States ($8.2M) and Russia (about $3.8M). World imports came to about $37M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Cast iron bathtub the same in all countries?
The base HS code 732421 for Cast iron bathtub is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for cast iron bathtub in Brazil?
In Brazil, cast iron bathtub (HS 732421) is classified under NCM 7324.21.00.