U.S. exports of Coach Screws of Iron or Steel (Threaded) (HS 731811) totaled $2.0M in August 2026.
Importers of Coach Screws of Iron or Steel (Threaded) paid $717K in duties in August 2026, an average duty rate of 74.69% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 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.
156 import shipments a month
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.
Subheading 10 of 12 in heading 7318
Subheading 731811 · $2.0M of $543.4M
ImportsExports
Imports
$970KYoY · free account
Exports
$2.0MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $14.6M of Coach Screws of Iron or Steel (Threaded) and exported $19.1M.
Through August 2026. Source: U.S. Census Bureau.
Trade Directory
List your company under HS 731811 — Coach Screws of Iron or Steel (Threaded), so the companies trading it can find you. Be the first supplier listed.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 7318110000 | Coach Screws, Threaded, of Iron or Steel | $960K | 74.69% | 100.00% | $717K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7318110000 | Coach Screws, Threaded, of Iron or Steel | $2.0M |
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
Mexico and Canada together take 54% of it.
customs district
origin
entry
rate provision · imports
duty collected equals 74.69% of imports for consumption.