U.S. exports of stud link chain of iron or steel (HS 731581) totaled $2.4M in August 2026.
Importers of Stud Link Chain of Iron or Steel paid $329K in duties in August 2026, an effective tariff rate of 68.25% of the $482K imported — duty actually collected as a share of that value, not the published tariff schedule. Stud Link Chain of Iron or Steel imports of $482K in August 2026 ran 28% above the year-to-date monthly average of $375K.
Last updated: August 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.
24 shipments/mo
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.
HSChapter 73
Subheading 4 of 8 in heading 7315
Subheading 731581 · $2.4M of $25.0M
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ImportsExports
Imports
$482KYoY · free account
Exports
$2.4MYoY · free account
12-mo low · imports
YoY · free accountOver the twelve months to August 2026, the U.S. imported $5.0M of Stud Link Chain of Iron or Steel.
Through August 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 7315810000 | Stud Link Chain of Iron or Steel | $482K | 68.25% | 102.63% | $329K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7315810000 | Stud Link Chain of Iron or Steel | $2.4M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Exports · August 2026
destination
Trinidad and Tobago and Mexico together take 90% of it.
customs district
origin
entry
rate provision · imports
duty collected equals 68.25% of total import value.