Every iron or steel screw, bolt, nut, coach screw, rivet and washer is classified in one HS heading: 7318. The six-digit level splits that heading by product type, and each importing market adds its own digits on top. This page maps the subheadings and shows where to verify the full code.
Six-digit descriptions are the Harmonized System text; the right-hand column gives examples of products from our own standards library that usually classify there. Classification still depends on the goods as presented (material, thread, whether nuts or washers travel with the bolts).
| HS code | Subheading | Typical products in our data |
|---|---|---|
| 7318.11 | Coach screws | Coach screws / lag screws (e.g. DIN 571 pattern) |
| 7318.12 | Other wood screws | Wood screws |
| 7318.13 | Screw hooks and screw rings | Screw hooks, screw rings |
| 7318.14 | Self-tapping screws | Self-tapping and self-drilling screws |
| 7318.15 | Other screws and bolts, whether or not with their nuts or washers | Hex bolts (DIN 933, DIN 931, ISO 4014, ISO 4017), socket head cap screws (DIN 912, ISO 4762), studs, machine screws |
| 7318.16 | Nuts | Hex nuts (DIN 934, ISO 4032) and other nuts |
| 7318.19 | Other | Residual subheading for threaded articles not covered above |
| 7318.21 | Spring washers and other lock washers | Spring lock washers (DIN 127-A, DIN 7980, ASME B18.21.1) |
| 7318.22 | Other washers | Flat washers (DIN 125-A, ISO 7089, ASME B18.22.1) |
| 7318.23 | Rivets | Rivets |
| 7318.24 | Cotters and cotter pins | Cotters, cotter pins, split pins |
| 7318.29 | Other | Residual subheading for other articles of heading 7318 |
Every WTO member uses the same first six digits, so 7318.16 means “nuts” in every schedule. Beyond six digits each market is free to split further:
These are the points that most often change the six-digit code, or send a line to a different national subheading:
| Market | Official lookup | What it gives you |
|---|---|---|
| European Union | TARIC consultation | Eight-digit CN code, TARIC codes and applicable measures |
| European Union | Access2Markets | Tariffs, rules of origin and import formalities |
| United States | USITC HTS | Ten-digit HTSUS line and duty rates |
| China | China Customs | Ten-digit export tariff line for the year of declaration |
| Global | WCO Trade Tools | The Harmonized System text and explanatory material |
Iron or steel bolts are classified in HS heading 7318; the six-digit subheading for “other screws and bolts, whether or not with their nuts or washers” is 7318.15. The EU, US and China add further digits to the national line, so confirm the full code on the official lookup for the destination market.
Nuts of iron or steel fall under subheading 7318.16.
Spring washers and other lock washers are 7318.21; other washers are 7318.22.
The first six digits are the same. The EU Combined Nomenclature (CN) extends them to eight digits and TARIC adds further codes for measures, so an EU import check needs the CN/TARIC line, not just HS6.
Not at the six-digit HS level — 7318 does not split by material there. National tariffs can split by material further down: for example, the US HTS has separate lines such as 7318.14.10.30 for self-tapping screws of stainless steel.
All descriptions of heading 7318 and its subheadings on this page are taken from the Harmonized System text as published in the sources above. Where a national code is not stated in them, this page does not state one; it points to the official lookup instead.