7318.21.00
Spring washers and other lock washers
General Rate
5.8%
MFN / Column 1 General
Special Rate
Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 2.9% (JP)
FTA / Preferential
Column 2 Rate
35%
Non-MFN countries
About HTS 7318.21.00
HTS code 7318.21.00 classifies imports of: Spring washers and other lock washers. This line sits within Chapter 73 (Sheet piling of iron or steel, whether or not drilled, punched or made from assembled elements; welded angles, shapes and sections, of iron or steel:), Section XV (Base Metals and Articles of Base Metal), and is catalogued as a tariff line in the USITC 2026 Basic Edition. The schedule specifies ad valorem (percentage-of-value) duty for this line. Getting the classification right is the single most important step in import compliance — a wrong code can mean overpayment of duty, shipment delays, or penalties at the border.
The general (MFN / Column 1 General) rate for HTS 7318.21.00 is 5.8%, which applies to most trading partners of the United States. A special preferential rate of "Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 2.9% (JP)" may reduce or eliminate duty when goods qualify under a free trade agreement such as USMCA, CAFTA-DR, or one of the bilateral FTAs. The Column 2 rate of 35% applies to imports from non-MFN countries such as Cuba and North Korea — a much higher historical "full" tariff.
Footnotes: [{"columns": ["general"], "value": "See 9903.88.03. ", "type": "endnote"}, {"columns": ["general"], "value": "See U.S. note 16 to subchapter III, chapter 99. ", "type": "endnote"}]. Beyond the published rate, importers should check for Section 201 safeguards, Section 301 China tariffs, and any active AD/CVD orders that can materially change the real landed cost. Always verify the classification with a licensed customs broker before committing to a supply contract — this page is a research tool, not a customs ruling.
Duty Rate Summary — HTS 7318.21.00
| Rate Column | Value | Applies To |
|---|---|---|
| General (Column 1) | 5.8% | Most-favored-nation (MFN) trading partners — the default rate for most US imports. |
| Special | Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 2.9% (JP) | Preferential rates under FTAs (USMCA, CAFTA-DR, GSP, etc.) when origin qualifies. |
| Column 2 | 35% | Statutory non-MFN rate for goods from countries without normal trade relations (Cuba, North Korea). |
Source: USITC Harmonized Tariff Schedule 2026 Basic Edition. See methodology for refresh cadence.
Details
- Classification
- Tariff Line
- Footnotes
- [{"columns": ["general"], "value": "See 9903.88.03. ", "type": "endnote"}, {"columns": ["general"], "value": "See U.S. note 16 to subchapter III, chapter 99. ", "type": "endnote"}]
Related Items in Chapter 73
Sheet piling
Of iron or nonalloy steel
Of alloy steel
Of iron or nonalloy steel
Of alloy steel
Switch blades, crossing frogs, point rods and other crossing pieces
Fish-plates and sole plates
Sleepers (cross-ties)
Other
Tubes, pipes and hollow profiles, of cast iron
Frequently Asked Questions
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Understanding This Tariff
HTS 7318.21.00 classifies under Chapter 73 (Sheet piling of iron or steel, whether or not drilled, punched or made from assembled elements; welded angles, shapes and sections, of iron or steel:), Section XV (Base Metals and Articles of Base Metal). The general duty rate of 5.8% applies to imports from most-favored-nation (MFN) countries, which includes the majority of US trading partners. Preferential rates under free trade agreements (such as USMCA, CAFTA-DR, or bilateral FTAs) may reduce or eliminate duty for qualifying imports from partner countries.
Importers should verify the correct HTS classification with a licensed customs broker or US Customs and Border Protection (CBP) before importing. Misclassification can result in penalties, delays, and additional duties.
Learn More About Tariffs
Related Trade & Economic Data
Data Sources
Tariff data from the U.S. International Trade Commission (USITC) Harmonized Tariff Schedule 2026 Basic Edition.
Duty rates are subject to change. Importers should verify current rates with U.S. Customs and Border Protection (CBP) before making import decisions. Additional duties, anti-dumping duties, or countervailing duties may apply.
Read our methodology — how this data is sourced, computed, and verified.