The HTS code is the key to every number in a DDP quote for fittings. It sets the base duty, decides whether Section 232 applies and identifies the AD/CVD orders that may cover the product.
Heading 7307: fittings of iron or steel
| Subheading | Goods |
|---|---|
| 7307.11 / 7307.19 | Cast fittings — non-malleable cast iron / other (malleable, ductile, cast steel) |
| 7307.21–7307.29 | Stainless steel: flanges, threaded elbows and sleeves, butt-weld fittings, other |
| 7307.91–7307.99 | Other steel: flanges, threaded fittings, butt-weld fittings, other (incl. socket-weld) |
Note: cast stainless 150# fittings go to 7307.19 or 7307.29 depending on the material and how they are made. Check the chapter notes and CBP rulings for your exact product.
Other materials
- 7412 — copper tube or pipe fittings (copper and brass, including solder and press fittings).
- 7609 — aluminium tube or pipe fittings (for example aluminium camlocks).
- 3917.40 — plastic fittings (PVC, CPVC, PEX).
- Valves are not fittings. They fall under heading 8481.
Duties that can stack in 2026
- Base (MFN) duty — usually low for fittings.
- Section 232 — steel derivative annexes list 7307 fittings, and copper fittings (7412) have been covered since August 2025. Since 6 April 2026 the duty applies to the full customs value at the annex rate. The same change for aluminium is explained in aluminium landed cost.
- Section 301 — many Chinese-origin fittings carry additional Section 301 duties.
- Country-level duties — see US tariffs in 2026. Check whether they stack with Section 232.
- AD/CVD deposits where an order applies — see AD on fittings.
- Fees: MPF and, for ocean cargo, HMF.
Classification tips that save money (legally)
- Describe each line precisely: material, connection type (threaded, socket-weld, butt-weld, grooved), size and pressure class.
- Split invoices by HTS code and origin. Mixed lines lead to holds and the highest rate being applied.
- Consider a binding ruling from CBP for high-volume, uncertain items.
- Never misdescribe fittings as "parts" or "valve parts" to avoid Section 232 or AD — the penalties far exceed the savings.
Related: Section 232 for steel · customs valuation · pricing DDP with a tariff buffer.
Trade-remedy orders, Section 232 annexes and Canadian surtaxes on steel and copper products change often, and scope depends on the exact product. This article is general guidance, not legal advice — confirm the treatment of your HTS code and origin before quoting.
Balance Trans ships pipe fittings from Vietnam and Cambodia to the USA and Canada on DDP terms — freight, customs entry, duties and delivery to your warehouse or job site. Fittings made elsewhere in Asia? Ask us what we can arrange; origin is always declared as it truly is. See DDP to the USA & Canada or send your item list for a quote.