Product classification
HS code for Steel screws: 7318.15
Iron or steel, threaded screws and bolts n.e.c. in item no. 7318.1, whether or not with their nuts or washers.
Classification of steel screws under HS 7318.15
Steel screws are classified under HS code 7318.15. This code is part of heading 7318, which covers a wide array of fasteners made of iron or steel. Subheading 7318.15 specifically addresses threaded screws and bolts, whether or not they are presented with their nuts or washers. The classification is primarily determined by the presence of external helical threads and the material composition of iron or non-stainless steel. Under the General Rules of Interpretation (GRI), products are classified according to the terms of the headings and any relative section or chapter notes. Heading 7318 distinguishes between threaded and non-threaded articles, and 7318.15 serves as a residual category for various threaded fasteners that do not meet the specific definitions of coach screws (7318.11) or wood screws (7318.12). This code is applicable regardless of the screw's head shape, drive type, or specific industrial application, provided it is a threaded fastener of iron or steel.
- Covers
- Machine screws and hex cap screws
- Socket head cap screws (Allen bolts)
- Carriage bolts and flange bolts
- Studs and threaded rods (if cut to size)
- Set screws and grub screws
- Also under 7318.15
- Fastenal hex bolts
- Würth machine screws
- Böllhoff self-tapping screws
- ITW Buildex anchor bolts
Codes often confused with 7318.15
Common mistake. Steel screws are often misclassified under 7318.12 (wood screws) or 7318.14 (self-tapping screws). Wood screws have a specific tapered thread and pointed tip designed for wood, while self-tapping screws are designed to create their own threads in metal or plastic. If the screw is made of stainless steel, it must be classified under 7318.15.31 or similar regional sub-divisions, though the 6-digit root remains 7318.15. Non-threaded fasteners like rivets (7318.23) are also a common source of confusion.
Top exporters and importers of HS 731815 (the code used for steel screws), 2025
In 2025, the largest exporter of HS 731815 (the code used for steel screws) in UN Comtrade data was China, with 20% of world exports; the largest importer in UN Comtrade data was the United States, with 13% 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 731815, not only steel screws.
Top exporters 2025 · share of world exports
- 1 China $4.5B 20% of world exports
- 2 Germany $3.2B 14% of world exports
- 3 United States $2.5B 11% of world exports
World total: $22.7B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $2.8B 13% of world imports
- 2 Germany $2.2B 9.8% of world imports
- 3 Mexico $1.5B 6.7% of world imports
World total: $22.3B 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 steel screws
Brazil classifies steel screws under NCM 7318.15.00: HS 7318.15 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 steel screws
What is the HS code for Steel screws?
The HS code for Steel screws is 731815 (Iron or steel; threaded screws and bolts n.e.c. in item no. 7318.1, whether or not with their nuts or washers). The international HS code for threaded steel screws and bolts is 7318.15. This code covers the majority of industrial and commercial threaded fasteners.
How do I classify Steel screws for customs?
Steel screws is classified under HS code 731815 — Iron or steel; threaded screws and bolts n.e.c. in item no. 7318.1, whether or not with their nuts or washers. This is a 6-digit subheading level code.
Does HS code 7318.15 include nuts and washers?
Yes, if the nuts and washers are imported together with the screws or bolts they are intended for, they are classified under 7318.15 as a complete assembly.
Which countries are the top exporters of steel screws (HS 731815)?
In 2025, the top exporters of HS 731815 (the code used for steel screws) in UN Comtrade data were China ($4.5B, 20% of world exports), Germany ($3.2B) and the United States ($2.5B). World exports came to about $22.7B, 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 steel screws (HS 731815)?
In 2025, the top importers of HS 731815 (the code used for steel screws) in UN Comtrade data were the United States ($2.8B, 13% of world imports), Germany ($2.2B) and Mexico ($1.5B). World imports came to about $22.3B, 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 Steel screws the same in all countries?
The base HS code 731815 for Steel 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 steel screws in Brazil?
In Brazil, steel screws (HS 731815) is classified under NCM 7318.15.00.