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HSChapter 73
U.S. exports of spring washers and other lock washers of iron or steel (HS 731821) totaled $9.5M in July 2026.
Importers of Spring Washers and Other Lock Washers of Iron or Steel paid $4.3M in duties in July 2026 — an effective duty rate of 61% on $7.1M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataEngineered to prevent fastener loosening under vibration and dynamic loads, spring washers and lock washers of iron or steel are critical components in automotive, rail, and heavy industrial assemblies. The US schedule distinguishes helical spring lock washers (7318210030) from other spring and lock washer types (7318210090). Germany leads US imports in this heading — reflecting the strong European precision-fastener industry — with China, Sweden, Taiwan, and India also supplying the market. Goods from China carry Section 301 tariff exposure, a factor that has encouraged sourcing diversification toward European and Taiwanese suppliers.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
889 shipments/mo
Helical spring lock washers — the split-ring type that exerts a spring force when compressed — are specifically classified under 7318210030. Other lock washer designs, such as toothed (internal or external serration) lock washers and wave washers, fall under the residual line 7318210090. The distinction matters because some antidumping or trade-remedy scope determinations reference specific washer types by design.
Heading 731821 covers only washers designed to prevent loosening — spring washers and lock washers that function through mechanical tension or tooth engagement. Heading 731822 covers flat, plain washers whose purpose is load distribution rather than locking. An importer must confirm whether a washer has a locking function to determine the correct heading, as the two headings may carry different duty rates and trade-remedy applicability.
Subheading 7 of 12 in heading 7318
Subheading 731821 · $7.4M of $472.6M
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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 |
|---|---|---|---|---|---|
| 7318210090 | Spring Washers and Oth Lock Washers, Ios, NESOI | $6.0M | 55.81% | 95.63% | $3.3M |
| 7318210030 | Helical Spring Lock Washers of Iron or Steel | $1.5M | 66.46% | 95.70% | $971K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7318210000 | Spring Washers and Oth Lock Washers, Iron or Steel | $9.5M |
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.
ImportsExports
Imports
$7.4MYoY · Pro
Exports
$9.5MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
Mexico and Canada together take 47% of it.
customs district
origin
entry
rate provision · imports
1.8% enters free of duty; the effective duty rate is 57.91%.