HS code · 6-digit subheading
HS Code 7318.11 – Iron or steel; threaded coach screws
HS code 7318.11 is the 6-digit subheading for iron or steel, threaded coach screws. It is used for hex head coach screws, square head coach screws, galvanized lag screws, timber frame screws and structural wood screws.
What HS 7318.11 covers
This HS code specifically covers threaded coach screws, also widely known as lag screws, made of iron or steel. These heavy-duty fasteners are characterized by their distinctive hexagonal or square heads and coarse, deep threads, designed for robust connections in wood or with lag shields in masonry. They are indispensable in structural timber applications, such as securing heavy timbers, decking, fencing, and general construction where high shear and pull-out resistance are paramount. International trade is driven by the global construction industry, timber merchants, and hardware distributors. Importers include large construction firms, building material suppliers, and DIY retailers. Exporters are typically specialized fastener manufacturers and steel product companies with expertise in producing high-strength, durable fasteners. Key considerations include material strength, thread profile, corrosion resistance (e.g., hot-dip galvanized), and compliance with relevant building and safety standards.
- Covers
- Hex head coach screws
- Square head coach screws
- Galvanized lag screws
- Timber frame screws
- Structural wood screws
- Heavy-duty decking screws
- Examples
- Simpson Strong-Tie lag screws
- GRK Fasteners RSS screws
- Spax PowerLags
- FastenMaster LedgerLoks
Codes often confused with 7318.11
Common mistake. Can be confused with 731812 (wood screws) which are generally smaller and have different head types, or 731815 (other threaded screws) if the specific coach screw characteristics are not recognized.
Top exporters and importers of HS code 731811, 2025
In 2025, the largest exporter of HS code 731811 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.
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 7318.11
Brazil does not split HS 7318.11: its NCM code is 7318.11.00.
All Brazil NCM codes in heading 73.18 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
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 HS 7318.11
What is HS code 731811?
HS code 731811 is a 6-digit subheading in the Harmonized System that covers: Iron or steel; threaded coach screws. This HS code specifically covers threaded coach screws, also widely known as lag screws, made of iron or steel. These heavy-duty fasteners are characterized by their distinctive hexagonal or square heads and coarse, deep threads, designed for robust connections in wood or with lag shields in masonry. They are indispensable in structural timber applications, such as securing heavy timbers, decking, fencing, and general construction where high shear and pull-out resistance are paramount. International trade is driven by the global construction industry, timber merchants, and hardware distributors. Importers include large construction firms, building material suppliers, and DIY retailers. Exporters are typically specialized fastener manufacturers and steel product companies with expertise in producing high-strength, durable fasteners. Key considerations include material strength, thread profile, corrosion resistance (e.g., hot-dip galvanized), and compliance with relevant building and safety standards.
What products fall under HS code 731811?
Hex head coach screws, square head coach screws, galvanized lag screws, timber frame screws, structural wood screws, heavy-duty decking screws
What are common misclassifications for HS code 731811?
Can be confused with 731812 (wood screws) which are generally smaller and have different head types, or 731815 (other threaded screws) if the specific coach screw characteristics are not recognized.
Which countries are the top exporters of goods under HS code 731811?
In 2025, the top exporters of HS code 731811 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 goods under HS code 731811?
In 2025, the top importers of HS code 731811 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.
How is HS code 731811 structured?
HS code 731811 is a 6-digit subheading under the Harmonized System. The first 2 digits (73) identify the chapter, digits 3-4 (18) identify the heading, and digits 5-6 (11) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 731811?
In Brazil, HS code 731811 is NCM 7318.11.00. The last two digits are 00 because Brazil does not split this HS code further.