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HSChapter 73
U.S. imports of stud link chain of iron or steel (HS 731581) totaled $226K in April 2026, traded with 10 countries.
Importers of Stud Link Chain of Iron or Steel paid $131K in duties in April 2026 — an effective duty rate of 68% on $192K in dutiable value, based on actual customs collections rather than the published tariff schedule. Stud Link Chain of Iron or Steel imports of $226K in April 2026 ran 38% below the year-to-date monthly average of $364K.
Last updated: April 2026 dataStud link chain — characterized by a transverse bar (stud) welded or cast across each link to prevent kinking — is a critical component in marine mooring, anchor systems, and offshore platform applications. China is the leading US supplier, with South Korea and India also contributing meaningfully to import volumes. Given the safety-critical nature of marine chain, buyers typically require mill certifications and third-party load testing documentation regardless of origin.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Marine-grade stud link chain generally requires mill test certificates confirming chemical composition and mechanical properties, classification society approval (such as from ABS, DNV, or Lloyd's Register), and proof of heat treatment. Customs entry documents must also correctly identify the chain grade, as higher-grade marine chain may be classified differently than general-purpose chain.
The defining feature is the stud — a bar inserted across the interior of each link — which differentiates it from open-link welded chain (7315.82) and other chain types (7315.89). If the stud is absent or the links are welded closed without a stud, the product likely falls under a different subheading, so physical inspection of sample links is advisable before classification.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | -- | $306K | +$306K |
| CHINA | $157K | -- | -$157K |
| EQUATORIAL GUINEA | -- | $49K | +$49K |
| INDIA | $46K | -- | -$46K |
| TURKS AND CAICOS ISLANDS | -- | $31K | +$31K |
Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 7315810000 | STUD LINK CHAIN OF IRON OR STEEL | $226K | 68.06% | $131K |
STUD LINK CHAIN OF IRON OR STEEL
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7315810000 | STUD LINK CHAIN OF IRON OR STEEL | $411K |
STUD LINK CHAIN OF IRON OR STEEL
111.5K kg
ARTICLES OF IRON OR STEEL NESOI
HS 732690
STRUCTURES AND PARTS NESOI OF IRON OR STEEL
HS 730890
THREADED SCREWS AND BOLTS NESOI OF IRON OR STEEL
HS 731815
COOKING APPLIANCES ETC FOR GAS FUEL, IRON OR STEEL
HS 732111
NUTS OF IRON OR STEEL
HS 731816
TABLE, KITCHEN ETC ARTICLES & PTS, STAINLESS STEEL
HS 732393
| State | Imports | Exports | Balance |
|---|---|---|---|
| Louisiana | -- | $300K | +$300K |
| South Carolina | $112K | -- | -$112K |
| Texas | -- | $49K | +$49K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| PORT HURON, MI | -- | $268K | +$268K |
| HOUSTON, TX | $112K | $49K | -$62K |
| SAVANNAH, GA | $46K | $3K | -$43K |