Product classification
HS code for Deck screws: 7318.12
Iron or steel, threaded wood screws other than coach screws.
Classification of deck screws under HS 7318.12
Deck screws are classified under HS code 7318.12, which specifically covers threaded wood screws made of iron or steel, excluding coach screws. The classification is determined by the fastener's design features, such as a sharp point for piercing wood, a coarse thread for gripping timber fibers, and often a countersunk head. Unlike standard wood screws, deck screws are typically manufactured with specialized coatings, such as ceramic, epoxy, or high-grade stainless steel, to resist corrosion in outdoor environments. Under the General Rules for the Interpretation (GRI) of the Harmonized System, products are classified based on their constituent material and their specific function. Since these are threaded articles of iron or steel designed for wood, they fall squarely into the 7318 heading. The distinction between 7318.12 and other subheadings like 7318.15 lies in the thread profile and the intended substrate. Deck screws are not intended for use with nuts, nor are they designed for metal-to-metal fastening, which reinforces their placement under the wood screw category. Furthermore, they are distinguished from coach screws by their head type; coach screws typically have hexagonal heads for wrenching, whereas deck screws use recessed drives like Torx or Phillips.
- Covers
- Stainless steel deck screws
- Ceramic-coated wood screws
- Bugle head wood screws
- Square drive timber screws
- Composite decking fasteners
- 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. Deck screws are frequently misclassified under HS code 7318.14, which is reserved for self-tapping screws. While some deck screws have self-drilling tips, they are primarily designed for wood substrates, whereas 7318.14 is intended for metal or plastic. Another common error is using 7318.15, which covers other screws and bolts. However, because deck screws have a tapered thread specifically for wood, 7318.12 is the more specific and correct heading. Additionally, coach screws (lag screws) must be placed under 7318.11, not 7318.12.
Top exporters and importers of HS 731812 (the code used for deck screws), 2025
In 2025, the largest exporter of HS 731812 (the code used for deck 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 deck 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 deck screws
Brazil classifies deck 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 deck screws
What is the HS code for Deck screws?
The HS code for Deck screws is 731812 (Iron or steel; threaded wood screws other than coach screws). The standard HS code for deck screws is 7318.12, which covers threaded wood screws made of iron or steel.
How do I classify Deck screws for customs?
Deck 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.
Are stainless steel deck screws classified differently?
No, stainless steel deck screws remain under 7318.12 because the heading covers all iron or steel wood screws, and stainless steel is an alloy of steel included in this category.
Which countries are the top exporters of deck screws (HS 731812)?
In 2025, the top exporters of HS 731812 (the code used for deck 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 deck screws (HS 731812)?
In 2025, the top importers of HS 731812 (the code used for deck 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 Deck screws the same in all countries?
The base HS code 731812 for Deck 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 deck screws in Brazil?
In Brazil, deck screws (HS 731812) is classified under NCM 7318.12.00.