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HS Heading 3603 : Safety fuses; detonating cords; percussion or detonating caps; igniters; electric detonators

HEADING DEFINITION & DISAMBIGUATION

HS Heading 3603 encompasses safety fuses; detonating cords; percussion or detonating caps; igniters; electric detonators. It classifies 6 6-digit WCO subheadings within Chapter 36 under the Harmonized System [USITC HTS 2026].

Chapter

Ch 36

Heading

3603

Subheadings

6 HS6

Status

Verified 2026

Subheadings Under Heading 3603

HS Code	WCO 6-Digit Subheading Description	Chapter	Operational Package
3603.10	Safety fuses	36	View 3603.10 Package →
3603.20	Detonating cords	36	View 3603.20 Package →
3603.30	Percussion caps	36	View 3603.30 Package →
3603.40	Detonating caps	36	View 3603.40 Package →
3603.50	Igniters	36	View 3603.50 Package →
3603.60	Electric detonators	36	View 3603.60 Package →

DISAMBIGUATION & CLASSIFICATION GUIDE

How to Select the Correct Subheading Under Heading 3603

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 3603 ↗

United States International Trade Commission official Harmonized Tariff Schedule.

CBP CROSS Rulings ↗

CBP e-Rulings database for Heading 3603 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 3603 Frequently Asked Questions (FAQ)

What commercial articles are grouped under HS Heading 3603?

HS Heading 3603 covers Safety fuses; detonating cords; percussion or detonating caps; igniters; electric detonators, grouping 6 6-digit WCO subheadings.

How are 6-digit subheadings structured under Heading 3603?

Subheadings under Heading 3603 range from 3603.11 to 3603.90, classifying goods by processing state, origin, or material composition.

What is the representative US import duty rate for Heading 3603?

US MFN general duty rates for Heading 3603 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 3603?

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 3603?

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

How do I distinguish between subheadings under Heading 3603?

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

Can goods under Heading 3603 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 3603?

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 3603?

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 3603?

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