U.S. imports of Threaded Screws and Bolts (NESOI) of Iron or Steel (HS 731815) totaled $221.3M in August 2026, imported from 80 countries.
Importers of Threaded Screws and Bolts (NESOI) of Iron or Steel paid $121.3M in duties in August 2026, an average duty rate of 55.59% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataThreaded screws and bolts not elsewhere specified — including structural bolts, track bolts, anchor bolts, hex-head cap screws, socket screws, machine screws, and studs — form one of the most granularly subdivided headings in the iron and steel fastener schedule, with more than two dozen 10-digit tariff lines distinguishing head style, thread diameter, and alloy content. Taiwan and China are the leading US suppliers, with South Korea, Japan, and Germany also significant sources. Structural bolts and continuously threaded rod studs are particularly important inputs for the construction and infrastructure sectors, and Chinese-origin goods in this heading are broadly subject to Section 301 tariffs.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
24.4K import shipments a month
Structural bolts (7318152030) are specifically designed for use in steel construction connections and typically conform to recognized structural standards (such as ASTM F3125). They are distinguished from track bolts (7318152020), anchor bolts (7318152041), and general hex-head bolts (7318152065) by their intended load-bearing application and specification compliance. Misclassifying a structural bolt as a general hex bolt — or vice versa — can result in an incorrect duty rate, so verifying the applicable ASTM or equivalent standard is advisable.
Standard studs of iron or steel fall under 7318155090 (or 7318155030 for stainless), while continuously threaded rod — threaded along its entire length rather than at the ends only — is separately classified under 7318155051 (alloy steel) or 7318155056 (iron/non-alloy steel). The distinction matters because continuously threaded rod is a commodity construction product with different pricing and trade-remedy exposure than precision-machined studs.
ImportsExports
Imports
$221.3MYoY · free account
Exports
$244.4MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $2.5B of Threaded Screws and Bolts (NESOI) of Iron or Steel and exported $2.6B.
Through August 2026. Source: U.S. Census Bureau.
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Subheading 1 of 12 in heading 7318
Subheading 731815 · $221.3M of $473.8M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7318159000 | Threaded Fasteners NESOI of Iron or Steel | $125.9M |
| 7318152000 | Bolts W/Wo Their Nuts O Wshrs, of Iron or Steel | $94.6M |
| 7318155000 | Studs of Iron or Steel, Threaded | $23.9M |
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.
Imports · August 2026
origin
China pays 76.7% duty; South Korea 49.4%.
customs district
destination
entry
rate provision · imports
1.2% enters free of duty; duty collected equals 55.59% of imports for consumption.