HS code · 6-digit subheading
HS Code 8404.90 – Boilers; parts of auxiliary plant, for use with boilers of heading no. 8402 and 8403 and parts of condensers for steam or other vapour power units
HS code 8404.90 is the 6-digit subheading for boilers, parts of auxiliary plant, for use with boilers of heading no. 8402 and 8403 and parts of condensers for steam or other vapour power units. It is used for condenser tubes, economizer fins, superheater coils, soot blower nozzles and tube sheets.
What HS 8404.90 covers
This HS code is dedicated to the parts of auxiliary plants for boilers (as described in 840410) and parts of condensers for steam or other vapor power units (as described in 840420). This category is crucial for the maintenance, repair, and overhaul (MRO) market of large-scale industrial and power generation equipment. The trade involves highly specialized components, often made from specific alloys to withstand extreme temperatures and pressures. Importers include power utilities, industrial facilities, and MRO service providers globally, who require these parts to ensure continuous operation and extend the lifespan of their capital-intensive machinery. Exporters are typically manufacturers specializing in precision-engineered components for heavy industry.
- Covers
- Condenser tubes
- Economizer fins
- Superheater coils
- Soot blower nozzles
- Tube sheets
- Water boxes
- Expansion joints
- Condenser plates
- Turbine exhaust hoods
- Examples
- Sandvik condenser tubes
- Valmet superheater elements
- Clyde Bergemann soot blower parts
- Alfa Laval plate heat exchanger parts
Codes often confused with 8404.90
Common mistake. Can be confused with general parts of boilers (840290, 840390) or other heat exchange apparatus parts (841990) if not specifically identified as components for the auxiliary plant or condensers of heading 8404.
Top exporters and importers of HS code 840490, 2025
In 2025, the largest exporter of HS code 840490 in UN Comtrade data was China, with 22% of world exports; the largest importer in UN Comtrade data was Saudi Arabia, with 31% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Top exporters 2025 · share of world exports
- 1 China $107M 22% of world exports
- 2 Finland $40M 8.1% of world exports
- 3 United States $39M 7.9% of world exports
World total: $489M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Saudi Arabia $208M 31% of world imports
- 2 United States $59M 8.6% of world imports
- 3 Germany $30M 4.4% of world imports
World total: $681M 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 codes for 8404.90 2
Brazil splits HS 8404.90 into 2 NCM codes, Mercosur's 8-digit tariff lines.
- 8404.90.10 Auxiliary plant parts, steam/super-heated boilersDe aparelhos auxiliares para caldeiras da posição 84.02
- 8404.90.90 Other parts of boiler plant and condensersOutras
All Brazil NCM codes in heading 84.04 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 8404.90
What is HS code 840490?
HS code 840490 is a 6-digit subheading in the Harmonized System that covers: Boilers; parts of auxiliary plant, for use with boilers of heading no. 8402 and 8403 and parts of condensers for steam or other vapour power units. This HS code is dedicated to the parts of auxiliary plants for boilers (as described in 840410) and parts of condensers for steam or other vapor power units (as described in 840420). This category is crucial for the maintenance, repair, and overhaul (MRO) market of large-scale industrial and power generation equipment. The trade involves highly specialized components, often made from specific alloys to withstand extreme temperatures and pressures. Importers include power utilities, industrial facilities, and MRO service providers globally, who require these parts to ensure continuous operation and extend the lifespan of their capital-intensive machinery. Exporters are typically manufacturers specializing in precision-engineered components for heavy industry.
What products fall under HS code 840490?
Condenser tubes, economizer fins, superheater coils, soot blower nozzles, tube sheets, water boxes, expansion joints, condenser plates, turbine exhaust hoods
What are common misclassifications for HS code 840490?
Can be confused with general parts of boilers (840290, 840390) or other heat exchange apparatus parts (841990) if not specifically identified as components for the auxiliary plant or condensers of heading 8404.
Which countries are the top exporters of goods under HS code 840490?
In 2025, the top exporters of HS code 840490 in UN Comtrade data were China ($107M, 22% of world exports), Finland ($40M) and the United States ($39M). World exports came to about $489M, 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 goods under HS code 840490?
In 2025, the top importers of HS code 840490 in UN Comtrade data were Saudi Arabia ($208M, 31% of world imports), the United States ($59M) and Germany ($30M). World imports came to about $681M, 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.
How is HS code 840490 structured?
HS code 840490 is a 6-digit subheading under the Harmonized System. The first 2 digits (84) identify the chapter, digits 3-4 (04) identify the heading, and digits 5-6 (90) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 840490?
Brazil splits HS code 840490 into 2 NCM codes: 8404.90.10 (Auxiliary plant parts, steam/super-heated boilers), 8404.90.90 (Other parts of boiler plant and condensers). The first 6 digits of each match the HS code.