Product classification
HS code for Carbon steel fittings: 7307.99
Iron or steel, tube or pipe fittings, n.e.c. in item no. 7307.9, other than stainless steel.
Classification of carbon steel fittings under HS 7307.99
Carbon steel fittings are classified under HS code 7307.99, which serves as the residual category for tube or pipe fittings made of iron or non-alloy steel that are not specifically named elsewhere in the 7307 heading. The classification process follows the General Rules of Interpretation (GRI) 1 and 6. Heading 7307 is structured to first distinguish between cast fittings (7307.11/19) and non-cast fittings. For non-cast items, the system differentiates between stainless steel and other types of steel. Carbon steel, defined as iron or non-alloy steel with a carbon content typically below 1.2% and lacking the 10.5% chromium required for stainless steel, falls into the "other" sub-category. Within this section, specific codes exist for flanges (7307.91), threaded elbows/bends (7307.92), and butt-welding fittings (7307.93). Consequently, 7307.99 is used for all other non-cast carbon steel fittings, such as socket-weld fittings (excluding elbows), couplings, sleeves, and non-threaded caps. These components are essential in industrial piping for oil, gas, and water systems where high-strength carbon steel is required but the corrosion resistance of stainless steel is not necessary.
- Covers
- Carbon steel couplings and sleeves
- Socket-weld unions and tees (non-threaded)
- Carbon steel pipe caps and plugs (non-threaded)
- Forged carbon steel branch outlets
- Non-alloy steel pipe nipples (non-threaded)
- Also under 7307.99
- Victaulic grooved fittings
- Swagelok compression fittings
- Parker Hannifin socket weld fittings
- Anvil International flanged fittings
Codes often confused with 7307.99
Common mistake. A frequent error is classifying these items under 7307.29, which is reserved for stainless steel fittings. The distinction depends on the chromium content; if it is 10.5% or more, it must move to the stainless category. Another common mistake is using 7307.19, which is for cast iron or cast steel fittings. Fittings that have been forged, machined, or cold-worked after casting, or those made from bar stock, belong in 7307.99. Additionally, threaded elbows are often incorrectly placed here instead of 7307.92.
Top exporters and importers of HS 730799 (the code used for carbon steel fittings), 2025
In 2025, the largest exporter of HS 730799 (the code used for carbon steel fittings) in UN Comtrade data was Germany, with 15% of world exports; the largest importer in UN Comtrade data was the United States, with 8.2% 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 730799, not only carbon steel fittings.
Top exporters 2025 · share of world exports
- 1 Germany $735M 15% of world exports
- 2 China $729M 15% of world exports
- 3 Italy $480M 10% of world exports
World total: $4.8B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $441M 8.2% of world imports
- 2 Germany $382M 7.1% of world imports
- 3 Canada $258M 4.8% of world imports
World total: $5.4B 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 that did not report are estimated from what other countries recorded trading with them. 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 carbon steel fittings
Brazil classifies carbon steel fittings under NCM 7307.99.00: HS 7307.99 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
EU Regulatory Requirements
This product falls under the Carbon Border Adjustment Mechanism (CBAM). Importers to the EU must declare embedded carbon emissions and purchase CBAM certificates.
Questions about carbon steel fittings
What is the HS code for Carbon steel fittings?
The HS code for Carbon steel fittings is 730799 (Iron or steel; tube or pipe fittings, n.e.c. in item no. 7307.9, other than stainless steel). The HS code for carbon steel fittings that are not flanges, threaded elbows, or butt-welding fittings is 7307.99.
How do I classify Carbon steel fittings for customs?
Carbon steel fittings is classified under HS code 730799 — Iron or steel; tube or pipe fittings, n.e.c. in item no. 7307.9, other than stainless steel. This is a 6-digit subheading level code.
Does this code include alloy steel fittings?
Yes, 7307.99 includes fittings made of other alloy steel (excluding stainless), provided they are not cast and do not meet the specific descriptions of the other subheadings in 7307.
Which countries are the top exporters of carbon steel fittings (HS 730799)?
In 2025, the top exporters of HS 730799 (the code used for carbon steel fittings) in UN Comtrade data were Germany ($735M, 15% of world exports), China ($729M) and Italy ($480M). World exports came to about $4.8B, 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 carbon steel fittings (HS 730799)?
In 2025, the top importers of HS 730799 (the code used for carbon steel fittings) in UN Comtrade data were the United States ($441M, 8.2% of world imports), Germany ($382M) and Canada ($258M). World imports came to about $5.4B, 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 Carbon steel fittings the same in all countries?
The base HS code 730799 for Carbon steel fittings 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 carbon steel fittings in Brazil?
In Brazil, carbon steel fittings (HS 730799) is classified under NCM 7307.99.00.