Product classification
HS code for Wood screws: 7318.12
Iron or steel, threaded wood screws other than coach screws.
Classification of wood screws under HS 7318.12
Wood screws are classified under HS code 7318.12 because they are specifically designed threaded fasteners made of iron or steel, intended for joining pieces of wood. According to the General Rules for the Interpretation (GRI) of the Harmonized System, specifically GRI 1 and 6, classification is determined by the terms of the headings and subheadings. Heading 7318 covers screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter-pins, washers, and similar articles of iron or steel. Subheading 7318.12 is explicitly reserved for threaded wood screws, excluding coach screws. These fasteners are characterized by a tapered shank and a sharp, wide-pitched thread that allows them to grip wood fibers effectively. The material composition is a primary factor; if the screws were made of copper, they would fall under Chapter 74. However, for standard iron or steel wood screws, 7318.12 is the definitive classification. The distinction is also based on the absence of a nut, as wood screws are designed to create their own mating thread in the material, unlike bolts which typically require a pre-drilled hole and a nut.
- Covers
- Slotted head wood screws
- Cross-recessed (Phillips) wood screws
- Square drive (Robertson) wood screws
- Stainless steel wood screws for timber construction
- Zinc-plated steel wood screws
- Twinfast wood screws
- Also under 7318.12
- Spax universal screws
- Reisser R2 screws
- Screwfix wood screws
- Hillman Group wood screws
Codes often confused with 7318.12
Common mistake. Wood screws are frequently confused with coach screws, which are classified under HS code 7318.11. While both are used in wood, coach screws (also known as lag bolts) are typically much larger and have a hexagonal head designed to be turned with a wrench rather than a screwdriver. Another common error is using HS code 7318.14, which is reserved for self-tapping screws. Self-tapping screws are generally intended for use in metal or plastic and have a different thread geometry and hardness compared to standard wood screws. Additionally, general-purpose screws or bolts that do not have the specific tapered wood-thread design are classified under 7318.15.
Top exporters and importers of HS 731812 (the code used for wood screws), 2025
In 2025, the largest exporter of HS 731812 (the code used for wood screws) in UN Comtrade data was Taiwan, with about 27% of world exports; the largest importer in UN Comtrade data was Germany, with 12% 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 731812, not only wood screws.
Top exporters 2025 · share of world exports
- 1 Taiwan* ~$398M 27% of world exports · partner records ↗
- 2 Germany $244M 16% of world exports
- 3 China $162M 11% of world exports
World total: $1.5B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Germany $194M 12% of world imports
- 2 Austria $108M 6.8% of world imports
- 3 United Kingdom $102M 6.4% of world imports
World total: $1.6B 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 marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. 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. UN Comtrade records Taiwan as "Other Asia, not elsewhere specified". Saudi Arabia's exports under that code are left out: they are far too large to be trade with Taiwan, so mostly undisclosed partners. 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 wood screws
Brazil classifies wood screws under NCM 7318.12.00: HS 7318.12 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 wood screws
What is the HS code for Wood screws?
The HS code for Wood screws is 731812 (Iron or steel; threaded wood screws other than coach screws). The HS code for threaded wood screws made of iron or steel is 7318.12.
How do I classify Wood screws for customs?
Wood screws is classified under HS code 731812 — Iron or steel; threaded wood screws other than coach screws. This is a 6-digit subheading level code.
How does 7318.12 differ from 7318.15?
HS code 7318.12 is specifically for screws with threads designed for wood, whereas 7318.15 is a residual category for other threaded screws and bolts, typically those used with nuts or in metal applications.
Which countries are the top exporters of wood screws (HS 731812)?
In 2025, the top exporters of HS 731812 (the code used for wood screws) in UN Comtrade data were Taiwan (about $398M, 27% of world exports), Germany ($244M) and China ($162M). World exports came to about $1.5B, 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 wood screws (HS 731812)?
In 2025, the top importers of HS 731812 (the code used for wood screws) in UN Comtrade data were Germany ($194M, 12% of world imports), Austria ($108M) and the United Kingdom ($102M). World imports came to about $1.6B, 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 Wood screws the same in all countries?
The base HS code 731812 for Wood 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 wood screws in Brazil?
In Brazil, wood screws (HS 731812) is classified under NCM 7318.12.00.