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HSChapter 73
U.S. imports of coach screws of iron or steel (threaded) (HS 731811) totaled $994K in April 2026, traded with 15 countries.
Importers of Coach Screws of Iron or Steel (Threaded) paid $739K in duties in April 2026 — an effective duty rate of 73% on $1.0M in dutiable value, based on actual customs collections rather than the published tariff schedule. Coach Screws of Iron or Steel (Threaded) imports of $994K in April 2026 ran 11% below the year-to-date monthly average of $1.1M.
Last updated: April 2026 dataCoach screws — also known as lag screws or lag bolts — are heavy-duty, large-diameter wood fasteners with a square or hexagonal head and a coarse tapered thread, designed to be driven with a wrench rather than a screwdriver. Classified under a single 10-digit line (7318110000), they are widely used in timber construction, utility pole hardware, and heavy structural wood assemblies. China is the primary US supplier, followed by Thailand and Taiwan. Section 301 tariffs apply to Chinese-origin coach screws, and importers should confirm whether specific products fall within any active antidumping or countervailing duty orders on fasteners.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Coach screws (7318.11) are distinguished by their large diameter, hex or square drive head, and coarse thread designed for wrench installation into heavy timber. Standard wood screws (7318.12) are smaller, have slotted or Phillips heads, and are driven by screwdrivers. The head drive type and installation method are the primary classification indicators; a product marketed as a 'structural lag screw' with a hex head belongs under 7318.11 rather than 7318.12.
Yes. Coach screws of iron or steel originating in China are subject to Section 301 tariffs. Importers should also check whether any antidumping or countervailing duty orders on steel fasteners from China cover coach screws within their scope, as fastener orders can be broadly written. A binding ruling or scope determination from CBP or Commerce is advisable for high-volume programs.
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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 |
|---|---|---|---|---|
| 7318110000 | COACH SCREWS, THREADED, OF IRON OR STEEL | $994K | 73.28% | $739K |
COACH SCREWS, THREADED, OF IRON OR STEEL
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7318110000 | COACH SCREWS, THREADED, OF IRON OR STEEL | $1.5M |
COACH SCREWS, THREADED, OF IRON OR STEEL
229.0K 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 |
|---|---|---|---|
| California | $177K | $393K | +$217K |
| Colorado | -- | $457K | +$457K |
| Illinois | $149K | $145K | -$4K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| LAREDO, TX | -- | $434K | +$434K |
| LOS ANGELES INTERNATIONAL AIRPORT, CA | -- | $343K | +$343K |
| LOS ANGELES, CA | $306K | $12K | -$294K |