Home › Chapter 84 › Heading 8404

HS Heading 8404 : Auxiliary plant for use with boilers of heading 8402 or 8403 (for example, economizers, super-heaters, soot removers, gas recoverers); condensers for steam or other vapor power units; parts thereof

HEADING DEFINITION & DISAMBIGUATION

HS Heading 8404 encompasses auxiliary plant for use with boilers of heading 8402 or 8403 (for example, economizers, super-heaters, soot removers, gas recoverers); condensers for steam or other vapor power units; parts thereof. It classifies 3 6-digit WCO subheadings within Chapter 84 under the Harmonized System [USITC HTS 2026].

Chapter

Ch 84

Heading

8404

Subheadings

3 HS6

Status

Verified 2026

Subheadings Under Heading 8404

HS Code	WCO 6-Digit Subheading Description	Chapter	Operational Package
8404.10	Auxiliary plant for use with boilers of heading 8402 or 8403	84	View 8404.10 Package →
8404.20	Condensers for steam or other vapor power units	84	View 8404.20 Package →
8404.90	Parts	84	View 8404.90 Package →

DISAMBIGUATION & CLASSIFICATION GUIDE

How to Select the Correct Subheading Under Heading 8404

Commercial shipments must be declared under the exact 6-digit WCO subheading that matches physical, chemical, or processing characteristics. Review the subheading descriptions above and verify against binding CBP CROSS rulings prior to entry filing.

Official Primary Sources & Authority References

USITC HTS Heading 8404 ↗

United States International Trade Commission official Harmonized Tariff Schedule.

CBP CROSS Rulings ↗

CBP e-Rulings database for Heading 8404 precedent rulings.

WCO Nomenclature ↗

World Customs Organization Harmonized System 2022 nomenclature standard.

U.S. Census Foreign Trade ↗

U.S. Census Bureau HTS-to-NAICS concordance and Schedule B export database.

Heading 8404 Frequently Asked Questions (FAQ)

What commercial articles are grouped under HS Heading 8404?

HS Heading 8404 covers Auxiliary plant for use with boilers of heading 8402 or 8403 (for example, economizers, super-heaters, soot removers, gas recoverers); condensers for steam or other vapor power units; parts thereof, grouping 3 6-digit WCO subheadings.

How are 6-digit subheadings structured under Heading 8404?

Subheadings under Heading 8404 range from 8404.11 to 8404.90, classifying goods by processing state, origin, or material composition.

What is the representative US import duty rate for Heading 8404?

US MFN general duty rates for Heading 8404 commodities range from Duty-Free up to representative ad valorem percentages under the 2026 US HTS.

Are Section 301 tariffs applicable to goods under Heading 8404?

Section 301 additional tariffs depend on the specific 8-digit or 10-digit US HTS code and country of origin (e.g. China Lists 1–4A).

What PGA message set flags apply to Heading 8404?

Partner Government Agency flags (FDA, USDA APHIS, EPA) apply depending on the specific commodity sub-classification.

How do I distinguish between subheadings under Heading 8404?

Review WCO subheading terms and candidate descriptions. For example, unroasted vs. roasted or decaffeinated vs. non-decaffeinated.

Can goods under Heading 8404 enter duty-free under USMCA?

Yes. Goods originating in USMCA territories (US, Mexico, Canada) enter duty-free under SPI code P with a valid Certificate of Origin.

What is the Section 321 de minimis limit for Heading 8404?

Eligible import shipments valued at $800 USD or less imported by one person on one day enter duty-free under 19 U.S.C. 1321.

What documents are required for formal customs entry of Heading 8404?

Commercial Invoice, Packing List, Bill of Lading, and CBP Form 7501 are mandatory for entries exceeding $2,500 USD.

How can an importer get a binding CBP classification ruling for Heading 8404?

Importers may apply for a binding ruling via CBP National Commodity Specialist Division under 19 CFR Part 177.