HTS heading 7307 · Chapter 73
HTS 7307: Tube or pipe fittings, of iron or steel
HTS heading 7307 covers tube or pipe fittings (for example, couplings, elbows, sleeves), of iron or steel. It has 20 tariff lines with a duty rate; the general (MFN) rates are 6.2% (4 lines), 5.6% (2 lines), 3.3% (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 |
|---|---|---|---|---|---|
| Cast fittings: | |||||
| 7307.11.00 | Of nonmalleable cast iron | 4.8% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% | |
| 7307.11.00.30 | For threaded pipe[kg] | Estimate → | |||
| Other: | |||||
| 7307.11.00.45 | For cast-iron soil pipe[kg] | Estimate → | |||
| 7307.11.00.60 | Other[kg] | Estimate → | |||
| 7307.19 | Other: | ||||
| 7307.19.30 | Ductile fittings | 5.6% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 45% | |
| 7307.19.30.40 | Grooved-end fittings (including grooved couplings)[kg] | Estimate → | |||
| Other: | |||||
| 7307.19.30.60 | Threaded[kg] | Estimate → | |||
| 7307.19.30.70 | With mechanical, push-on (rubber compression) or flanged joints attached[kg] | Estimate → | |||
| 7307.19.30.85 | Other[kg] | Estimate → | |||
| 7307.19.90 | Other | 6.2% | Free (A+,AU,BH,CL,CO,D,E,IL, JO,KR,MA, OM,P,PA,PE,S,SG) | 45% | |
| 7307.19.90.30 | Unions[kg] | Estimate → | |||
| Other: | |||||
| 7307.19.90.40 | Grooved-end fittings (including grooved couplings)[kg] | Estimate → | |||
| Other: | |||||
| 7307.19.90.60 | Threaded[kg] | Estimate → | |||
| 7307.19.90.80 | Other[kg] | Estimate → | |||
| Other, of stainless steel: | |||||
| 7307.21 | Flanges: | ||||
| 7307.21.10.00 | Not machined, not tooled and not otherwise processed after forging[kg] | 3.3% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 34% | Estimate → |
| 7307.21.50.00 | Other[kg] | 5.6% | Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 45% | Estimate → |
| 7307.22 | Threaded elbows, bends and sleeves: | ||||
| 7307.22.10.00 | Sleeves (couplings)[kg] | Free | 45% | Estimate → | |
| 7307.22.50.00 | Other[kg] | 6.2% | Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 45% | Estimate → |
| 7307.23.00 | Butt welding fittings | 5% | Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 45% | |
| 7307.23.00.30 | Not machined, not tooled and not otherwise processed after forming[kg] | Estimate → | |||
| 7307.23.00.90 | Other[kg] | Estimate → | |||
| 7307.29.00 | Other | 5% | Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 45% | |
| 7307.29.00.30 | Nipples[kg] | Estimate → | |||
| 7307.29.00.90 | Other[kg] | Estimate → | |||
| Other: | |||||
| 7307.91 | Flanges: | ||||
| Not machined, not tooled and not otherwise processed after forging: | |||||
| 7307.91.10.00 | Of iron or nonalloy steel[kg] | 3.3% | Free (A,AU,BH,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG) | 25% | Estimate → |
| 7307.91.30.00 | Of alloy steel (except stainless steel)[kg] | 3.2% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG) | 33% | Estimate → |
| 7307.91.50 | Other | 5.5% | Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 2.75% (JP) | 45% | |
| With an inside diameter of less than 360 mm: | |||||
| 7307.91.50.10 | Of iron or nonalloy steel[kg] | Estimate → | |||
| 7307.91.50.30 | Of alloy steel (except stainless steel)[kg] | Estimate → | |||
| With an inside diameter of 360 mm or more: | |||||
| 7307.91.50.50 | Of iron or nonalloy steel[kg] | Estimate → | |||
| 7307.91.50.70 | Of alloy steel (except stainless steel)[kg] | Estimate → | |||
| 7307.92 | Threaded elbows, bends and sleeves: | ||||
| 7307.92.30 | Sleeves (couplings) | Free | 45% | ||
| 7307.92.30.10 | Of iron or nonalloy steel[kg] | Estimate → | |||
| 7307.92.30.30 | Of alloy steel (except stainless steel)[kg] | Estimate → | |||
| 7307.92.90.00 | Other[kg] | 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% | Estimate → |
| 7307.93 | Butt welding fittings: | ||||
| With an inside diameter of less than 360 mm: | |||||
| 7307.93.30 | Of iron or nonalloy steel | 6.2% | Free (A+,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 45% | |
| 7307.93.30.10 | Not machined, not tooled and not otherwise processed after forging[kg] | Estimate → | |||
| 7307.93.30.40 | Other[kg] | Estimate → | |||
| 7307.93.60.00 | Of alloy steel (except stainless steel)[kg] | 5.5% | Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 45% | Estimate → |
| 7307.93.90 | With an inside diameter of 360 mm or more | 4.3% | Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 45% | |
| Of iron or nonalloy steel: | |||||
| 7307.93.90.10 | Not machined, not tooled and not otherwise processed after forging[kg] | Estimate → | |||
| 7307.93.90.40 | Other[kg] | Estimate → | |||
| 7307.93.90.60 | Of alloy steel (except stainless steel)[kg] | Estimate → | |||
| 7307.99 | Other: | ||||
| Not machined, not tooled and not otherwise processed after forging: | |||||
| 7307.99.10.00 | Of iron or nonalloy steel[kg] | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG) | 25% | Estimate → |
| 7307.99.30.00 | Of alloy steel (except stainless steel)[kg] | 3.2% | Free (A,AU,BH,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG) | 33% | Estimate → |
| 7307.99.50 | Other | 4.3% | Free (A,AU,B,BH,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG) | 45% | |
| Of iron or nonalloy steel: | |||||
| 7307.99.50.15 | Nipples[kg] | Estimate → | |||
| 7307.99.50.45 | Other[kg] | Estimate → | |||
| 7307.99.50.60 | Of alloy steel (except stainless steel)[kg] | Estimate → |
49 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 7307.11.00 at the general rate of 4.8%, shipped by ocean, before any Chapter 99 tariffs:
| Base duty (4.8%) | $480.00 |
| Merchandise Processing Fee (0.3464%, min $34.58) | $34.64 |
| Harbor Maintenance Fee (0.125%) | $12.50 |
| Duty and fees | $527.14 |
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 7307?
Heading 7307 has 20 rate lines. The general (MFN) duty rates are 6.2% (4 lines), 5.6% (2 lines), 3.3% (2 lines), Free (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 7307?
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 7307?
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.