HS Code for Pipes and Fittings

The HS code for pipes and fittings falls under Chapter 73 (articles of iron or steel) of the Harmonized System. Steel pipes are classified under headings 7304 (seamless), 7305 (welded, OD >406.4 mm), and 7306 (welded, OD <=406.4 mm). Pipe fittings are classified under heading 7307. Stainless steel variants use the same headings with different subheadings.

Correct HS code classification for pipes and fittings is required for customs clearance, duty calculation, and trade compliance in international piping material shipments. An incorrect HS code can result in shipment delays, additional duties, or penalties at customs.

The Harmonized System (HS) is administered by the World Customs Organization (WCO) and uses a 6-digit code structure. Individual countries add additional digits (typically 8-10 total) for national tariff specificity.

HS Codes for Steel Pipes

HS Code	Description	Pipe Type
7304	Tubes, pipes, and hollow profiles, seamless, of iron or steel	Seamless pipes
7304.11	Seamless line pipe, stainless steel	SMLS SS line pipe
7304.19	Seamless line pipe, other than stainless	SMLS CS/alloy line pipe
7304.22	Seamless drill pipe, stainless steel	SMLS SS drill pipe
7304.23	Seamless casing/tubing, stainless	SMLS SS OCTG
7304.24	Seamless casing/tubing, other	SMLS CS OCTG
7304.31	Seamless, cold-drawn/rolled, stainless	Cold-finished SS pipe
7304.41	Seamless, cold-drawn/rolled, other	Cold-finished CS/alloy pipe
7304.51	Seamless, other, stainless steel	Hot-finished SS pipe
7304.59	Seamless, other, alloy steel	Hot-finished alloy pipe
7305	Tubes/pipes, welded, OD >406.4 mm	Large-diameter welded pipes
7305.11	Longitudinal SAW, line pipe	LSAW line pipe
7305.12	Other longitudinal welded, line pipe	ERW/EFW large line pipe
7305.19	Other (spiral welded), line pipe	SSAW line pipe
7306	Tubes/pipes, welded, OD <=406.4 mm	Small/medium welded pipes
7306.11	Welded line pipe, stainless	ERW SS line pipe
7306.19	Welded line pipe, other	ERW CS line pipe
7306.30	Other welded, circular, iron/non-alloy	ERW carbon steel
7306.40	Other welded, circular, stainless	ERW stainless pipe

HS Codes for Pipe Fittings

HS Code	Description	Fitting Type
7307	Tube or pipe fittings, of iron or steel	All fittings
7307.11	Cast fittings, non-malleable, of non-alloy iron	Cast iron fittings
7307.19	Other cast fittings (stainless, alloy)	Cast SS/alloy fittings
7307.21	Flanges, of stainless steel	SS flanges
7307.22	Threaded elbows, bends, sleeves, of stainless	SS threaded fittings
7307.23	Butt welding fittings, stainless steel	SS BW elbows, tees, reducers
7307.29	Other fittings, stainless steel	SS other fittings
7307.91	Flanges, other than stainless	CS/alloy flanges
7307.92	Threaded elbows, bends, sleeves, other	CS threaded fittings
7307.93	Butt welding fittings, other than stainless	CS BW fittings
7307.99	Other fittings, other than stainless	CS other fittings

Classification Tips

The correct HS code depends on four key factors:

1. Material: Iron, non-alloy steel, stainless steel, or other alloy steel
2. Manufacturing method: Seamless, ERW, SAW, or cast
3. Outer diameter: Above or below 406.4 mm (16 in.) for welded pipes
4. End use: Line pipe, casing/tubing (OCTG), or general purpose

Pro Tip

The 406.4 mm (16 in. OD) threshold is the dividing line between HS 7305 (large welded pipe) and HS 7306 (small/medium welded pipe). This boundary is critical because duty rates often differ significantly between the two headings. A 16-inch ERW pipe (OD = 406.4 mm) falls under 7306, while an 18-inch ERW pipe (OD = 457.2 mm) falls under 7305. For more detail on HS codes for all piping products, see the full reference.

Always confirm the applicable national tariff code (8 or 10 digits) with the destination country’s customs authority, as duty rates and anti-dumping measures vary by country and change frequently.

Read the full guide to HS codes