Product classification
HS code for Coach screws: 7318.11
Iron or steel, threaded coach screws.
Classification of coach screws under HS 7318.11
Coach screws, also known as lag screws, are classified under HS code 731811. This classification is determined by their physical characteristics as heavy-duty threaded fasteners made of iron or steel. Unlike standard wood screws, coach screws are designed with a hexagonal or square head to be driven by a wrench or socket rather than a screwdriver. They feature a deep, coarse thread specifically intended for high-torque applications in timber or for securing heavy metal brackets to wooden structures. Under the Harmonized System, Chapter 73 covers articles of iron or steel, and heading 7318 specifically addresses screws, bolts, nuts, and similar fasteners. Subheading 731811 is a specific provision for coach screws, distinguishing them from other types of wood screws or bolts based on their unique thread profile and head design. The classification remains consistent regardless of whether the screw is galvanized, zinc-plated, or stainless steel, provided the base metal is iron or steel.
- Covers
- Hexagonal head coach screws
- Square head lag screws
- Heavy-duty timber screws with lag threads
- Zinc-plated steel coach screws
- Galvanized lag bolts for outdoor construction
- Stainless steel coach screws for marine use
- Also under 7318.11
- Simpson Strong-Tie lag screws
- GRK Fasteners RSS screws
- Spax PowerLags
- FastenMaster LedgerLoks
Codes often confused with 7318.11
Common mistake. Coach screws are often misclassified under HS code 731812, which covers other wood screws. The distinction lies in the head type and the thickness of the shank; 731812 is generally for smaller, slotted or recessed head screws. Another common error is using HS code 731815, which covers other screws and bolts. While coach screws share characteristics with bolts, the fact that they are pointed and designed to create their own thread in wood specifically mandates the use of 731811. Using a general bolt code can lead to incorrect duty assessments during customs clearance.
Top exporters and importers of HS 731811 (the code used for coach screws), 2025
In 2025, the largest exporter of HS 731811 (the code used for coach screws) in UN Comtrade data was China, with 17% of world exports; the largest importer in UN Comtrade data was Germany, with 8.1% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 731811, not only coach screws.
Top exporters 2025 · share of world exports
- 1 China $45M 17% of world exports
- 2 Germany $44M 17% of world exports
- 3 Czechia $34M 13% of world exports
World total: $263M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Germany $28M 8.1% of world imports
- 2 Italy $27M 7.9% of world imports
- 3 Hong Kong $26M 7.5% of world imports
World total: $341M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for coach screws
Brazil classifies coach screws under NCM 7318.11.00: HS 7318.11 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
EU Regulatory Requirements
This product falls under the Carbon Border Adjustment Mechanism (CBAM). Importers to the EU must declare embedded carbon emissions and purchase CBAM certificates.
Questions about coach screws
What is the HS code for Coach screws?
The HS code for Coach screws is 731811 (Iron or steel; threaded coach screws). The specific HS code for threaded coach screws made of iron or steel is 731811.
How do I classify Coach screws for customs?
Coach screws is classified under HS code 731811 — Iron or steel; threaded coach screws. This is a 6-digit subheading level code.
Are lag bolts and coach screws the same for HS classification?
Yes, in most international trade contexts, lag bolts are considered coach screws and are classified under 731811 because they are threaded for wood and have a bolt-like head.
Which countries are the top exporters of coach screws (HS 731811)?
In 2025, the top exporters of HS 731811 (the code used for coach screws) in UN Comtrade data were China ($45M, 17% of world exports), Germany ($44M) and Czechia ($34M). World exports came to about $263M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of coach screws (HS 731811)?
In 2025, the top importers of HS 731811 (the code used for coach screws) in UN Comtrade data were Germany ($28M, 8.1% of world imports), Italy ($27M) and Hong Kong ($26M). World imports came to about $341M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Coach screws the same in all countries?
The base HS code 731811 for Coach screws is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for coach screws in Brazil?
In Brazil, coach screws (HS 731811) is classified under NCM 7318.11.00.