HTS heading 7318 · Chapter 73
HTS 7318: Screws, bolts, nuts, coach screws, screw hooks,…
HTS heading 7318 covers screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter pins, washers (including spring washers) and similar articles, of iron or steel. It has 17 tariff lines with a duty rate; the general (MFN) rates are Free (6 lines), 12.5% (2 lines), 5.7% (2 lines) and others.
Imports may also owe Chapter 99 tariffs (Section 232, 301 or 201) depending on origin and date, plus the Merchandise Processing Fee and, by sea, the Harbor Maintenance Fee.
Rates from the 2026 HTS Revision 22, effective October 30, 2026. Source: U.S. International Trade Commission.
Tariff lines and duty rates
| HTS code | Description | General | Special | Column 2 | Estimate |
|---|---|---|---|---|---|
| Threaded articles: | |||||
| 7318.11.00.00 | Coach screws[kg] | 12.5% | Free (A+,AU,B,BH,CL,CO,D,E,IL, JO,KR,MA, OM,P,PA,PE,S,SG) | 25% | Estimate → |
| 7318.12.00.00 | Other wood screws[kg] | 12.5% | Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% | Estimate → |
| 7318.13.00 | Screw hooks and screw rings | 5.7% | Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 45% | |
| 7318.13.00.30 | Having shanks or threads with a diameter of less than 6 mm[kg] | Estimate → | |||
| 7318.13.00.60 | Having shanks or threads with a diameter of 6 mm or more[kg] | Estimate → | |||
| 7318.14 | Self-tapping screws: | ||||
| 7318.14.10 | Having shanks or threads with a diameter of less than 6 mm | 6.2% | Free (A+,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 3.1% (JP) | 45% | |
| 7318.14.10.30 | Of stainless steel[kg] | Estimate → | |||
| 7318.14.10.60 | Other[kg] | Estimate → | |||
| 7318.14.50 | Having shanks or threads with a diameter of 6 mm or more | 8.6% | Free (A+,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 4.3% (JP) | 45% | |
| 7318.14.50.20 | Of stainless steel[kg] | Estimate → | |||
| 7318.14.50.80 | Other[kg] | Estimate → | |||
| 7318.15 | Other screws and bolts, whether or not with their nuts or washers: | ||||
| 7318.15.20 | Bolts and bolts and their nuts or washers entered or exported in the same shipment | Free | 3.5% | ||
| 7318.15.20.10 | Having shanks or threads with a diameter of less than 6 mm[kg] | Estimate → | |||
| Having shanks or threads with a diameter of 6 mm or more: | |||||
| 7318.15.20.20 | Track bolts[kg] | Estimate → | |||
| 7318.15.20.30 | Structural bolts[kg] | Estimate → | |||
| Bent bolts: | |||||
| 7318.15.20.41 | Right-angle anchor bolts[kg] | Estimate → | |||
| 7318.15.20.46 | Other[kg] | Estimate → | |||
| Other: | |||||
| With round heads: | |||||
| 7318.15.20.51 | Of stainless steel[kg] | Estimate → | |||
| 7318.15.20.55 | Other[kg] | Estimate → | |||
| With hexagonal heads: | |||||
| 7318.15.20.61 | Of stainless steel[kg] | Estimate → | |||
| 7318.15.20.65 | Other[kg] | Estimate → | |||
| Other: | |||||
| 7318.15.20.91 | Of stainless steel[kg] | Estimate → | |||
| 7318.15.20.95 | Other[kg] | Estimate → | |||
| 7318.15.40.00 | Machine screws 9.5 mm or more in length and 3.2 mm or more in diameter (not including cap screws)[kg] | Free | 2.2¢/kg | Estimate → | |
| 7318.15.50 | Studs | Free | 45% | ||
| 7318.15.50.30 | Of stainless steel[kg] | Estimate → | |||
| Other: | |||||
| Continuously threaded rod: | |||||
| 7318.15.50.51 | Of alloy steel[kg] | Estimate → | |||
| 7318.15.50.56 | Other[kg] | Estimate → | |||
| 7318.15.50.90 | Other[kg] | Estimate → | |||
| Other: | |||||
| 7318.15.60 | Having shanks or threads with a diameter of less than 6 mm | 6.2% | Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 45% | |
| Socket screws: | |||||
| 7318.15.60.10 | Of stainless steel[kg] | Estimate → | |||
| 7318.15.60.40 | Other[kg] | Estimate → | |||
| Other: | |||||
| 7318.15.60.70 | Of stainless steel[kg] | Estimate → | |||
| 7318.15.60.80 | Other[kg] | Estimate → | |||
| 7318.15.80 | Having shanks or threads with a diameter of 6 mm or more | 8.5% | Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 45% | |
| 7318.15.80.20 | Set screws[kg] | Estimate → | |||
| Other: | |||||
| Socket screws: | |||||
| 7318.15.80.30 | Of stainless steel[kg] | Estimate → | |||
| 7318.15.80.45 | Other[kg] | Estimate → | |||
| Other: | |||||
| With hexagonal heads: | |||||
| 7318.15.80.55 | Of stainless steel[kg] | Estimate → | |||
| Other: | |||||
| 7318.15.80.66 | Cap screws[kg] | Estimate → | |||
| 7318.15.80.69 | Other[kg] | Estimate → | |||
| Other: | |||||
| 7318.15.80.82 | Of stainless steel[kg] | Estimate → | |||
| 7318.15.80.85 | Other[kg] | Estimate → | |||
| 7318.16.00 | Nuts | Free | 0.5% | ||
| Lugnuts: | |||||
| 7318.16.00.15 | Non-locking chrome-plated[kg] | Estimate → | |||
| 7318.16.00.30 | Locking[kg] | Estimate → | |||
| 7318.16.00.45 | Other[kg] | Estimate → | |||
| Other: | |||||
| 7318.16.00.60 | Of stainless steel[kg] | Estimate → | |||
| 7318.16.00.85 | Other[kg] | Estimate → | |||
| 7318.19.00.00 | Other[kg] | 5.7% | Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 2.85% (JP) | 45% | Estimate → |
| Non-threaded articles: | |||||
| 7318.21.00 | Spring washers and other lock washers | 5.8% | Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 2.9% (JP) | 35% | |
| 7318.21.00.30 | Helical spring lock washers[kg] | Estimate → | |||
| 7318.21.00.90 | Other[kg] | Estimate → | |||
| 7318.22.00.00 | Other washers[kg] | Free | 1.3¢/kg | Estimate → | |
| 7318.23.00.00 | Rivets[kg] | Free | 2.2¢/kg | Estimate → | |
| 7318.24.00.00 | Cotters and cotter pins[kg] | 3.8% | Free (A,AU,B,BH,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG) | 45% | Estimate → |
| 7318.29.00.00 | Other[kg] | 2.8% | Free (A,AU,B,BH,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG) | 45% | Estimate → |
57 lines shown. Statistical suffixes (the last two digits) inherit the rate of the 8-digit subheading above them.
Example: base duty and fees on $10000
For HTS 7318.11.00.00 at the general rate of 12.5%, shipped by ocean, before any Chapter 99 tariffs:
| Base duty (12.5%) | $1250.00 |
| Merchandise Processing Fee (0.3464%, min $34.58) | $34.64 |
| Harbor Maintenance Fee (0.125%) | $12.50 |
| Duty and fees | $1297.14 |
Origin-specific tariffs can multiply this. Run this example from China or from Mexico to see every line.
Special program codes in this heading
- A, A*, A+
- Generalized System of Preferences (GSP)
- AU
- U.S.–Australia FTA
- B
- Automotive Products Trade Act
- BH
- U.S.–Bahrain FTA
- CL
- U.S.–Chile FTA
- CO
- U.S.–Colombia Trade Promotion Agreement
- D
- African Growth and Opportunity Act (AGOA)
- E, E*
- Caribbean Basin Economic Recovery Act
- IL
- U.S.–Israel FTA
- JO
- U.S.–Jordan FTA
- JP
- U.S.–Japan Trade Agreement
- KR
- U.S.–Korea FTA (KORUS)
- MA
- U.S.–Morocco FTA
- OM
- U.S.–Oman FTA
- P, P+
- CAFTA-DR
- PA
- U.S.–Panama Trade Promotion Agreement
- PE
- U.S.–Peru Trade Promotion Agreement
- S, S+
- USMCA (United States–Mexico–Canada Agreement)
- SG
- U.S.–Singapore FTA
A special rate applies only when the goods qualify under that program's rules of origin and the claim is made at entry.
Duty by country of origin
Frequently asked questions
What is the duty rate for HTS 7318?
Heading 7318 has 17 rate lines. The general (MFN) duty rates are Free (6 lines), 12.5% (2 lines), 5.7% (2 lines), 6.2% (2 lines). Products of free trade agreement partners may enter at the special rate, and Column 2 rates apply to countries without normal trade relations. Chapter 99 tariffs can be added on top: calculate the full amount.
Do Section 301, 232 or 201 tariffs apply to HTS 7318?
It depends on the 8- or 10-digit subheading, the country of origin, the entry date and, for Section 232, the metal content. These additional duties are listed in Chapter 99 of the HTS. The free duty calculator checks each program for a given code, origin and date and shows which apply and why.
What fees are added to an import under HTS 7318?
Formal entries pay the Merchandise Processing Fee of 0.3464% of value (minimum $34.58, maximum $670.86 in FY2027). Ocean shipments also pay the Harbor Maintenance Fee of 0.125% of value. See the import duty calculator for how they combine.