What Every Member of the 

Trade Community Should Know About: 

Classification and 

Marking of Pipe 

Fittings under 

Heading 7307 

AN INFORMED COMPLIANCE PUBLICATION 

FEBRUARY 2010 
Classification and Marking of Pipe Fittings under Heading 7307 

February 2010 

NOTICE:

This publication is intended to provide guidance and information to the trade community. 

It reflects the position on or interpretation of the applicable laws or regulations by U.S. 

Customs and Border Protection (CBP) as of the date of publication, which is shown on 

the front cover. It does not in any way replace or supersede those laws or regulations. 

Only the latest official version of the laws or regulations is authoritative. 

Publication History 

First Published: July 2008 

Reviewed With No Changes February 2010 

PRINTING NOTE: 

This publication was designed for electronic distribution via the CBP website 

(http://www.cbp.gov) and is being distributed in a variety of formats. It was originally set 

up in Microsoft Word 2003®. Pagination and margins in downloaded versions may vary 

depending upon which word processor or printer you use. If you wish to maintain the 

original settings, you may wish to download the .pdf version, which can then be printed 

using the freely available Adobe Acrobat Reader®. 

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Classification and Marking of Pipe Fittings under Heading 7307 

February 2010 

PREFACE 

On December 8, 1993, Title VI of the North American Free Trade Agreement Implementation 

Act (Pub. L. 103-182, 107 Stat. 2057), also known as the Customs Modernization or “Mod” Act, 

became effective. These provisions amended many sections of the Tariff Act of 1930 and 

related laws. 

Two new concepts that emerge from the Mod Act are “informed compliance” and “shared 

responsibility,” which are premised on the idea that in order to maximize voluntary compliance 

with laws and regulations of U.S. Customs and Border Protection, the trade community needs to 

be clearly and completely informed of its legal obligations. Accordingly, the Mod Act imposes a 

greater obligation on CBP to provide the public with improved information concerning the trade 

community's rights and responsibilities under customs regulations and related laws. In addition, 

both the trade and U.S. Customs and Border Protection share responsibility for carrying out 

these requirements. For example, under Section 484 of the Tariff Act, as amended (19 U.S.C. 

1484), the importer of record is responsible for using reasonable care to enter, classify and 

determine the value of imported merchandise and to provide any other information necessary to 

enable U.S. Customs and Border Protection to properly assess duties, collect accurate 

statistics, and determine whether other applicable legal requirements, if any, have been met. 

CBP is then responsible for fixing the final classification and value of the merchandise. An 

importer of record’s failure to exercise reasonable care could delay release of the merchandise 

and, in some cases, could result in the imposition of penalties. 

Regulations and Rulings (RR) of the Office of International Trade has been given a major role in 

meeting the informed compliance responsibilities of U.S. Customs and Border Protection. In 

order to provide information to the public, CBP has issued a series of informed compliance 

publications on new or revised requirements, regulations or procedures, and a variety of 

classification and valuation issues. 

This publication, prepared by the National Commodity Specialist Division of Regulations and 

Rulings is entitled “Classification and Marking of Pipe Fittings under Heading 7307”. It provides 

guidance regarding the classification of these items. We sincerely hope that this material, 

together with seminars and increased access to rulings of U.S. Customs and Border Protection, 

will help the trade community to improve voluntary compliance with customs laws and to 

understand the relevant administrative processes. 

The material in this publication is provided for general information purposes only. Because 

many complicated factors can be involved in customs issues, an importer may wish to obtain a 

ruling under Regulations of U.S. Customs and Border Protection, 19 C.F.R. Part 177, or to 

obtain advice from an expert who specializes in customs matters, for example, a licensed 

customs broker, attorney or consultant. 

Comments and suggestions are welcomed and should be addressed to U.S. Customs and 

Border Protection, Office of International Trade, Executive Director, Regulations and Rulings, 

799 9th Street N.W. 7th floor, Washington, D.C. 20229-1177. 

Sandra L. Bell 

Executive Director, Regulations and Rulings 

Office of International Trade 

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Classification and Marking of Pipe Fittings under Heading 7307 

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INTRODUCTION..........................................................................................7

TUBE OR PIPE FITTINGS OF IRON OR STEEL .......................................7

PARTS OF GENERAL USE........................................................................8

IRON AND STEEL DEFINED......................................................................8

WHAT IS A PIPE OR TUBE?......................................................................9

SUBHEADING 7307.11.00 THROUGH 7307.19.90....................................9

Cast fittings .................................................................................................................. 9

SUBHEADINGS 7307.21 THROUGH 7307.29 .........................................11

Stainless Steel fittings ................................................................................................ 11

SUBHEADINGS 7307.91 THROUGH 7307.99 .........................................13

Other .......................................................................................................................... 13

ENTRY REQUIREMENTS.........................................................................15

ANTIDUMPING AND COUNTERVAILING DUTIES..................................15

SPECIAL MARKING REQUIREMENTS ...................................................16

QUESTIONS TO ASK WHEN CLASSIFYING PIPE AND TUBE 

FITTINGS:..................................................................................................17

ADDITIONAL INFORMATION...................................................................19

The Internet................................................................................................................ 19

Customs Regulations ................................................................................................. 19

Customs Bulletin ........................................................................................................ 19

Importing into the United States ................................................................................. 20

Informed Compliance Publications............................................................................. 20

Value Publications...................................................................................................... 21

“Your Comments are Important”................................................................................. 22

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INTRODUCTION 

This Informed Compliance Publication (ICP) proposes to explore both the complexities 

of the tariff nomenclature regarding iron and steel pipe fittings and the corresponding 

special country of origin marking requirements. Iron and steel pipe fittings are classified 

in Section XV, Chapter 73, Heading 7307, Harmonized Tariff Schedule of the United 

States (HTSUS), which reads: “Tube or pipe fittings (for example, couplings, elbows, 

sleeves) of iron or steel.” 

TUBE OR PIPE FITTINGS OF IRON OR STEEL 

What is a pipe fitting? 

Merriam-Webster’s Online dictionary defines a pipe fitting as, “a piece (as a coupling or 

elbow) used to connect pipes or as an accessory to a pipe.” In addition to connecting 

pieces of pipe, pipe fittings are also commonly used to change the direction of pipe or to 

close off the end of a pipe. Iron or steel pipes and tubes are used in a variety of 

industries. Different types of pipe fittings are used to connect different types of pipe. 

The type of fitting used will depend on the type of service the pipe being connected 

must perform. 

The Explanatory Notes (ENs) to Heading 7307 further describe a pipe fitting for the 

purpose of classification within this heading. They state, “This heading covers fittings of 

iron or steel, mainly used for connecting the bores of two tubes together, or for 

connecting a tube to some other apparatus, or for closing the tube aperture. This 

heading does not however cover articles used for installing pipes and tubes but which 

do not form an integral part of the bore (e.g. hangers, stays and similar supports which 

merely fix or support the tubes and pipes on walls, clamping or tightening bands or 

collars (hose clips) used for clamping flexible tubing or hose to rigid piping taps, 

connecting pieces, etc.).” Therefore, excluded from classification in this heading are 

articles used for installing pipe and tube that do not form an integral part of the bore. 

The bore of a tube is illustrated below: 

 

bore 

How do pipe fittings connect pipes or tubes? Pipe fittings that connect the bores of two 

tubes, etc. do so by: screwing, when using cast iron or steel threaded fittings; by 

welding, with butt-welding or socket welding steel fittings; or by contact when using 

removable steel fittings. 

Therefore, this heading includes, among other things, flanges, elbows, bends, reducers, 

tees, crosses, caps and plugs, stub-ends, fittings for tubular railings and structural 

elements, multi-branch pieces, nipples, unions, clamps and collars. 

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Classification and Marking of Pipe Fittings under Heading 7307 

February 2010 

A list of items excluded from classification in this heading is found in the Explanatory 

Notes (ENs) to Heading 7307. They include: 

(a) Clamps and other devices specially designed for assembling parts of structures. 

(b) Bolts, nuts, screws, etc., suitable for use in the assembly of tube or pipe fittings. 

(c) Thermostatic bellows and expansion joints. 

(d) Hangers, stays and similar supports used for installing pipe and tube as 

mentioned above; and tube plugs, threaded or not, fitted with a ring, hook, etc. 

(e.g. those used for fixing washing lines). 

(e) Fittings equipped with taps, cocks, valves, etc. 

(f) Insulated joints for electrical conduit tubing. 

(g) Connections for assembling bicycle or motorcycle frames. 

PARTS OF GENERAL USE 

Section XV, Note 2, HTSUS, states that “Throughout the tariff schedule, the expression 

’parts of general use’ means: (a) articles of heading 7307, 7312, 7315, 7317 or 7318 

and similar articles of base metal.” Therefore, the pipe fittings of iron or steel of 

Heading 7307 are considered parts of general use. Pipe fittings would not be classified 

as part of another item anywhere throughout the HTSUS where parts of general use are 

excluded but would remain classified as pipe fittings. For example, NY Ruling K87017 

(dated, July 9, 2004), classified auto-weld fittings for bioprocessing equipment in 

Heading 7307 because Note 1 to Section XVI (the section where this equipment is 

classified) excludes parts of general use. 

IRON AND STEEL DEFINED 

Heading 7307 provides for pipe and tube fittings of iron or steel. The pipe fittings of 

this heading can be divided into three major groupings: cast iron or cast steel fittings, 

stainless steel fittings and all other iron or steel fittings. 

Iron (Fe) is a silver-gray, hard, brittle element. Although malleable and capable of being 

hammered, pure iron is rarely used without adding other elements. Iron carbon alloys 

are commonly used in the production of fittings. 

Steel is defined in Chapter 72 Note 1(d) of the HTSUS as ferrous materials other than 

those of Heading 7203 which are usefully malleable and which contain by weight 2 

percent or less of carbon. However, chromium steels may contain higher proportions of 

carbon. 

Stainless steel is defined in Chapter 72 Note 1(e) of the HTSUS as alloy steels 

containing, by weight 1.2 percent or less of carbon and 10.5 percent or more of 

chromium, with or without other elements. 

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Classification and Marking of Pipe Fittings under Heading 7307 

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WHAT IS A PIPE OR TUBE? 

It should be noted that only iron and steel fittings for pipes and tubes are classified 

within Heading 7307. The courts determined in John V. Carr & Son, Inc. v. United 

States, 76 Cust. Ct. 162, C.D. 4652, (1976), that “a pipe or tube as it is known within the 

industry is made of a single extruded compound rather than many materials.” In 

addition to metal pipe, polyvinylchloride (PVC) pipe is also made of a single extruded 

material. Therefore, HQ Ruling 088393 (dated March, 26, 1991) held that iron or steel 

fittings that connect PVC pipe were classified in Heading 7307. Hose, however, is 

commonly made up of many materials. Therefore, fittings that connect hose would not 

be classified in Heading 7307. However, fittings that are suitable for connecting both 

hose and pipe or tube of a single extruded material are classified in Heading 7307. 

 

SUBHEADING 7307.11.00 THROUGH 7307.19.90 

Cast fittings 

The first major grouping of iron and steel pipe fittings are manufactured by a casting 

process. They are provided for in subheadings 7307.11.00 through 7307.19.90. Their 

ten digit subheadings allow us to further classify the various types of cast fittings. A 

cast fitting is made by pouring molten metal into a mold of the desired shape. 

Subheading 7307.11.00 provides for cast fittings of nonmalleable cast iron. The 

expression, “cast iron” is defined in Chapter 73 Note 1 of the HTSUS. This term applies 

to products obtained by casting in which iron predominates by weight over each of the 

other elements and which do not comply with the chemical composition of steel as 

defined in Note 1(d) to Chapter 72, supra. Nonmalleable cast iron is brittle and will 

break if hammered or otherwise subjected to pressure. Nonmalleable cast iron is also 

known as gray iron. Gray iron is the most common type of cast iron. Fittings made of 

nonmalleable gray iron are commonly known as “cast iron fittings.” 

Subheading 7307.11.0030 provides for nonmalleable cast iron fittings for threaded pipe. 

To connect threaded pipes a fitting must also be threaded. A thread is a spiral ridge on 

the end of the fitting or pipe. Male threads appear on the outside diameter of the pipe or 

fitting and female threads appear on the inner diameter. In order to make a successful 

connection the threads of the fitting and pipe must be aligned correctly. To this end, 

threads are made to industry standards. There are two main industry standards, the 

National Pipe Thread (NPT) and the National Standard Free Fitting Straight Mechanical 

Pipe Thread (NPSM). 

Subheading 7307.11.0045 is for nonmalleable cast iron fittings that are not threaded 

and are used for cast iron soil pipe. These fittings are used primarily in building 

construction applications including sanitary and waste drains. 

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Classification and Marking of Pipe Fittings under Heading 7307 

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Subheading 7307.11.0060 provides for all other nonmalleable cast iron fittings. 

Subheadings 7307.19.30 and 7307.19.90 provide for cast fittings of iron or steel that are 

malleable. Unlike nonmalleable cast iron, malleable iron is workable or formable as 

cast. 

Subheading 7307.19.30 provides for cast ductile iron fittings. Ductile cast iron, also 

known as nodular cast iron, is characterized by the presence of graphite in tiny spheres. 

This cast iron is produced by the introduction of elements such as magnesium during 

the molten state. Chapter 73, Additional U.S. Note 2 to the HTSUS defines ductile 

fittings for the purposes of this subheading as “fittings which contain over 2.5 percent 

carbon and over 0.02 percent of magnesium or of magnesium and cerium, by weight.” 

Subheading 7307.19.3040 provides for ductile iron grooved-end fittings including 

grooved couplings. These fittings are designed to be used in grooved piping systems. 

They have grooves or shoulders that permit fast installation in field applications. Three 

types of grooved end fittings are illustrated here. 

 

 cross elbow tee 

Subheading 7307.19.3060 covers threaded ductile iron fittings as illustrated by these 

examples. 

 

 

 coupling union elbow 

Subheading 7307.19.3070 includes ductile iron fittings with mechanical, push-on 

(rubber compression), or flanged joints attached. Mechanical joint fittings commonly 

consist of four parts: a fitting body that is bell shaped on one end, a rubber gasket that 

fits into the bell socket, a gland or follower ring which compresses the gasket and head 

bolts with nuts. A push on joint consists of a fitting body and a gasket. The fitting body 

is often bell shaped and incorporates a recess for the gasket. After inserting the gasket 

into this recess the fitting can be “pushed on” to the pipe. Flanged joints are designed 

with a flange on the end of the fitting that has been drilled with holes. The flange on the 

fitting body is connected to the flange of a pipe through the use of bolts and nuts. 

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Classification and Marking of Pipe Fittings under Heading 7307 

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Subheading 7307.19.3085 includes all other cast, ductile fittings other than grooved 

end, threaded or those with mechanical, push-on or flanged joints attached. 

 

Subheading 7307.19.90 includes all other cast fittings other than nonmalleable cast iron 

and ductile fittings. These include other malleable iron fittings (other than ductile iron) 

and other cast fittings of steel. These malleable iron fittings have been rendered 

malleable by heat treating after casting. 

Subheading 7307.19.9030 provides for other cast unions. These are other than cast 

nonmalleable unions and other than cast ductile unions. 

Subheading 7307.19.9040 provides for cast grooved-end fittings including grooved 

couplings that are not nonmalleable and not ductile. 

 ↓ grooved end 

 

 

Subheading 7307.19.9060 provides for all other malleable cast fittings of iron or steel 

that are threaded and are not ductile, not a union and not grooved end. 

All other malleable cast iron or steel fittings other than ductile, union, grooved end or 

threaded fittings are classified in subheading 7307.19.9080. 

SUBHEADINGS 7307.21 THROUGH 7307.29 

Stainless Steel fittings 

The second major grouping of pipe and tube fittings consists of stainless steel fittings 

that are not manufactured by casting. They are provided for in subheadings 7307.21 

through 7307.29. 

Subheadings 7307.21.10 and 7307.21.50 provide for flanges. Flanges are used to 

connect two pipes together. This can be accomplished by welding or by the use of 

threads or by fastening with bolts and nuts. 

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Classification and Marking of Pipe Fittings under Heading 7307 

February 2010 

Types of flanges include weld neck, blind, slip-on, socket weld, lap-joint, threaded and 

swivel flanges. Weld neck, blind and threaded flanges are illustrated below: 

 

Subheading 7307.21.1000 provides for stainless steel flanges that are not machined, 

not tooled and not otherwise processed after forging. If the flange undergoes a surface 

cleaning process, it cannot be classified within this subheading. This subheading 

covers flanges that are imported in a rough condition and that have not been processed 

in any way after being forged. 

Descaling and shot blasting are processes that remove surface scale from the metal. 

These operations are not considered incidental to the creation of a forging. Instead they 

are processes that occur after the forging of the initial product. HQ 087910 (dated 

December 4, 1990), decided under the predecessor tariff, found that descaling was 

determined to be a further working process which not only improved the appearance of 

the forging but which also worked the metal. As such, the automobile forging that was 

the subject of this ruling was considered otherwise processed after forging. Similarly, 

forged pipe fittings which have been descaled are considered to have been processed 

after forging. 

 

Subheading 7307.21.5000 includes all other stainless steel flanges. 

Subheadings 7307.22.10 and 7307.22.50 provide for specific threaded stainless steel 

fittings. They are elbows, bends and sleeves. 

Stainless steel threaded sleeves, also known as couplings, are provided for in 

subheading 7307.22.1000. (See illustration for threaded coupling on page 10.) 

Threaded stainless steel elbows and bends are classified in subheading 7307.22.5000. 

Stainless steel butt welding fittings are provided for in subheading 7307.23.0000. The 

ENs to Heading 7307 tell us that in the case of butt welding fittings the ends can either 

be square cut or chamfered. Butt welding fittings that are chamfered have ends that 

have been ground to create a secondary flat surface on the corner that produces a 

beveled edge. 

 ↓ beveled edge 

 

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Classification and Marking of Pipe Fittings under Heading 7307 

February 2010 

All other stainless steel fittings that are not flanges, or threaded elbows, bends and 

sleeves or butt welding fittings are classified in subheading 7307.29. 

Subheading 7307.29.0030 provides for stainless steel nipples. A pipe nipple is a short 

length of either seamless or welded pipe or tube that is usually threaded on both ends. 

A nipple that is fully threaded along the entire length is known as a close nipple. HQ 

Ruling 951940 (dated July 31, 1992) determined, based on available industry 

information, that nipples are twelve inches or less in length. 

 galvanized nipple close nipple 

 

All other stainless steel fittings (except stainless steel flanges, stainless threaded 

elbows, bends, sleeves and stainless steel butt welding fittings and stainless steel 

nipples) are provided for in subheading 7307.29.0090. 

SUBHEADINGS 7307.91 THROUGH 7307.99 

Other 

The last major grouping of pipe and tube fittings includes all iron and steel fittings that 

are not cast or made of stainless steel. These fittings are provided for in subheadings 

7307.91 through 7307.99. 

Subheading 7307.91 provides for flanges that are not cast and not of stainless steel. 

They are similar to the flanges previously illustrated. The flanges of subheading 

7307.91.1000 are not machined, not tooled and not otherwise processed after forging. 

They are made of iron or nonalloy steel. Nonalloy steel is also known as carbon steel. 

Flanges made of alloy steel (except stainless steel) that are not machined, not tooled 

and not otherwise processed after forging are classified in subheading 7307.91.3000. 

Other alloy steel is defined in Chapter 72 Note 1(f) of the HTSUS as steels not 

complying with the definition of stainless steel and containing one or more of the 

following elements by weight in the proportion shown: 

-0.3% or more of aluminum 

-0.0008% or more of boron 

-0.3% or more of chromium 

-0.3% or more of cobalt 

-0.4% or more of copper 

-0.4% or more of lead 

-1.65% or more of manganese 

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Classification and Marking of Pipe Fittings under Heading 7307 

February 2010 

-0.08% or more of molybdenum 

-0.3% or more of nickel 

-0.06% or more of niobium 

-0.6% or more of silicon 

-0.05% or more of titanium 

-0.3% or more of tungsten (wolfram) 

-0.1% or more of vanadium 

-0.05% or more of zirconium 

-0.1% or more of other elements (except sulphur, phosphorous, carbon and nitrogen), 

taken separately. 

It is important to note that the flanges of both these subheadings (7307.91.1000 and 

7307.91.3000) cannot be processed in any manner after the initial forging process, to 

be considered not machined, not tooled and not otherwise processed. 

Subheading 7307.91.50 provides for those flanges not cast and not of stainless steel 

that are processed in some manner after forging. Subheadings 7307.91.5010 and 

7307.91.5030 include those flanges with an inside diameter of less than 360 mm. 

Those of iron or nonalloy steel are classified in subheading 7307.91.5010 and those of 

alloy steel, except stainless, are classified in subheading 7307.91.5030. Flanges with 

an inside diameter of 360 mm or more of iron or nonalloy steel that are processed after 

forging are provided for in subheading 7307.91.5050 and those of alloy steel, except 

stainless, are provided for in subheading 7307.91.5070. 

 inside diameter 

Subheading 7307.92 provides for threaded elbows, bends and sleeves that are not cast 

and not of stainless steel. Threaded sleeves, also known as couplings, of iron or 

nonalloy steel are classified in subheading 7307.92.3010 and threaded sleeves or 

couplings of alloy steel, other than stainless, are classified in subheading 7307.92.3030. 

Elbows and bends that are threaded but not cast and not of stainless steel are provided 

for in subheading 7307.92.9000. 

Butt welding fittings that are not cast and not made of stainless steel are classified in 

subheading 7307.93. Those butt welding fittings with an inside diameter of less than 

360 mm that are not machined, not tooled and not otherwise processed after forging are 

classified in subheading 7307.93.3010 if made of iron or nonalloy steel. All other butt 

welding fittings with inside diameters of less than 360 mm of iron or nonalloy steel are 

classified in subheading 7307.93.3040. All alloy (except stainless) butt welding fittings 

with inside diameters measuring less than 360 mm are classified in subheading 

7307.93.6000. 

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Classification and Marking of Pipe Fittings under Heading 7307 

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Butt welding fittings with an inside diameter of 360 mm or more are classified in 

subheading 7307.93.90. Those butt welding fittings with an inside diameter of 360 mm 

or more that are not machined, not tooled and not otherwise processed after forging are 

classified in subheading 7307.93.9010 if made of iron or nonalloy steel. All other butt 

welding fittings with inside diameters of 360 mm or more of iron or nonalloy steel are 

classified in subheading 7307.93.9040. All alloy (except stainless) butt welding fittings 

with inside diameters measuring 360 mm or more are classified in subheading 

7307.93.9060. 

All other iron or steel fittings that are not cast, not of stainless steel, not flanges, not a 

threaded elbow, bend or sleeve and not a butt welding fitting will be classified in 

subheading 7307.99. 

These other fittings if not machined, not tooled and not otherwise advanced after forging 

are classified in subheading 7307.99.1000 if of iron or nonalloy steel and in subheading 

7307.99.3000 if of alloy steel, other than stainless. 

If, however, they are machined, tooled or otherwise advanced after forging, they are 

classified in subheading 7307.99.50. If they are of iron or nonalloy steel and are nipples 

they are classified in subheading 7307.99.5015. If they are other than nipples of iron or 

nonalloy steel they are classified in subheading 7307.99.5045. All other fittings of alloy 

steel (except stainless steel) that are not cast and that are machined, tooled or 

otherwise advanced after forging are classified in subheading 7307.99.5060. 

ENTRY REQUIREMENTS 

Section 141.89(a) of the CBP Regulations outlines additional information that is required 

at time of entry for certain classes of merchandise. For the products of Chapter 72 and 

headings 7301 to 7307, HTSUS, this requirement is a statement of the percentages of 

weight of carbon and any metallic elements contained in the articles in the form of a mill 

analysis or mill test certificate. A mill test certificate is a requirement for each entry of 

pipe or tube fittings. 

ANTIDUMPING AND COUNTERVAILING DUTIES 

There are several antidumping cases that presently cover various types of pipe fittings. 

A list of current active antidumping and countervailing duty cases can be found at the 

International Trade Commission website at www.usitc.gov. The link to “Antidumping 

and Countervailing duty orders” under “Investigations” provides a search mechanism for 

current orders by country, date and product group. Further information can be obtained 

by contacting the Office of Field Operations at your local port of entry. 

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Classification and Marking of Pipe Fittings under Heading 7307 

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SPECIAL MARKING REQUIREMENTS 

The country of origin marking statute, section 304, Tariff Act of 1930, as amended (19 

U.S.C. 1304), provides that, unless excepted, every article of foreign origin (or its 

container) “imported into the United States shall be marked in a conspicuous place as 

legibly, indelibly and permanently as the nature of the article (or its container) will 

permit, in such a manner as to indicate to the ultimate purchaser in the United States 

the English name of the country of origin of the article.” Part 134, CBP Regulations (19 

CFR Part 134) implements the country of origin marking requirements and exceptions of 

19 U.S.C. 1304. 

In addition, 19 U.S.C. 1304(c)(1) requires that all pipe (iron, steel and stainless steel), 

and pipe and tube fittings (steel, stainless steel, chrome-moly steel or cast or malleable 

iron) be marked to indicate the proper country of origin by one of five statutory methods. 

The acceptable methods of marking are die stamping, cast-in-mold lettering, etching, 

engraving or continuous paint stenciling. 

19 U.S.C 1304(c)(2), provides that if, because of the nature of an article, it is technically 

or commercially infeasible to mark by one of the five prescribed methods, the article 

may be marked by an equally permanent method of marking or in the case of small 

diameter pipe, tube or pipe fittings, by tagging the containers or bundles. Small 

diameter fittings are defined in Treasury Decision 92-70 as fittings having a nominal 

diameter of 1⁄4 inch or less. 19 U.S.C. 1304(c)(1) further provides that no exception 

from these marking requirements may be made under 19 U.S.C. 1304(a)(3) for these 

products. The exceptions noted within 19 U.S.C. 1304(a)(3) that are not allowed for 

these products are the same exceptions included in 134.32 of the CBP Regulations. 

Therefore, all iron or steel pipe and tube fittings must be marked by one of the five 

statutory methods listed above with the exception of fittings having a nominal diameter 

of 1⁄4 inch or less. 

 An example of an instance where CBP approved an alternative marking method for 

certain pipe and tubes can be found in HQ Ruling 734806 (dated April 22, 1993). 

However, the determination that a product cannot be marked by one of these methods 

because it is technically or commercially infeasible will be made by CBP on a case-bycase basis. 

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Classification and Marking of Pipe Fittings under Heading 7307 

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QUESTIONS TO ASK WHEN CLASSIFYING PIPE AND TUBE FITTINGS: 

Are the fittings made of iron or steel? 

If yes, continue with questions. 

If not, classify elsewhere in the HTSUS. 

Are they used to connect two pieces of pipe (not hose), or to connect a pipe to another 

apparatus or to close off the end of a pipe? 

If yes, continue with questions. 

If not, classify elsewhere in the HTSUS. 

Are the fittings cast? 

 If yes, continue with questions of Section A 

 If not, continue with questions of Section B 

Section A Are they nonmalleable cast iron? 

If yes, classify in subheading 7307.11.00. 

If not, are they of ductile iron? 

If yes, classify in subheading 7307.19.30. 

If not, classify all other cast fittings in subheading 

7307.19.90. 

Section B Are they made of stainless steel? 

If yes, continue with questions in Section B. 

If not, continue with questions in Section C. 

Are they stainless steel flanges? 

 If yes, classify in subheading 7307.21.10 or 7307.21.50 

 Depending on whether or not the flange is machined, tooled 

 or otherwise processed after forging. 

 If not, are they stainless steel threaded elbows, bends or 

sleeves? 

 If yes, classify in subheading 7307.22.10 if the fitting is a sleeve 

and in subheading 7307.22.50 if a bend or elbow. 

 If not, are they stainless steel butt welding fittings? 

 If yes, classify in subheading 7307.23.00. 

 If not, classify in subheading 7307.29.00. 

Section C Are they flanges? 

 

 If yes, classify in subheadings 7307.91.1000 and 7307.91.3000 if 

they are not machined, not tooled or not otherwise advanced after 

forging depending on whether they are iron or nonalloy steel or 

alloy steel. Classify in subheading 7307.91.50 if they are machined, 

tooled or otherwise processed. Classification at the ten digit level is 

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February 2010 

 dependent upon the inside diameter and whether or not they are 

iron or nonalloy steel or of alloy steel. 

 If not, are they threaded elbows, bends or sleeves? 

 If yes, classify in subheading 7307.92.30 if a sleeve or coupling and 

in subheading 7307.92.90 if a bend or an elbow. 

 If not, are they butt welding fittings? 

 If yes, classify in subheadings 7307.93.30 through 7307.93.90 

depending on the measurement of the inside diameter, the 

chemistry of the fitting and whether the fitting is machined, tooled or 

otherwise processed after forging. 

 If not, (butt welding) classify all fittings that are not machined, not 

tooled or not otherwise processed after forging in subheadings 

7307.99.10 and 7307.99.30 dependent on the chemistry. 

 

 If processed after forging, classify all other fittings in subheading 

7307.99.50. 

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February 2010 

ADDITIONAL INFORMATION 

The Internet 

The home page of U.S. Customs and Border Protection on the Internet’s World Wide 

Web, provides the trade community with current, relevant information regarding CBP 

operations and items of special interest. The site posts information -- which includes 

proposed regulations, news releases, publications and notices, etc. -- that can be 

searched, read on-line, printed or downloaded to your personal computer. The web site 

was established as a trade-friendly mechanism to assist the importing and exporting 

community. The web site also links to the home pages of many other agencies whose 

importing or exporting regulations that U.S. Customs and Border Protection helps to 

enforce. The web site also contains a wealth of information of interest to a broader 

public than the trade community. For instance, the “Know Before You Go” publication 

and traveler awareness campaign is designed to help educate international travelers. 

 

The web address of U.S. Customs and Border Protection is http://www.cbp.gov

Customs Regulations 

The current edition of Customs and Border Protection Regulations of the United States 

is a loose-leaf, subscription publication available from the Superintendent of 

Documents, U.S. Government Printing Office, Washington, DC 20402; telephone (202) 

512-1800. A bound edition of Title 19, Code of Federal Regulations is also available for 

sale from the same address. All proposed and final regulations are published in the 

Federal Register, which is published daily by the Office of the Federal Register, National 

Archives and Records Administration, and distributed by the Superintendent of 

Documents. Information about on-line access to the Federal Register may be obtained 

by calling (202) 512-1530 between 7 a.m. and 5 p.m. Eastern time. These notices are 

also published in the weekly Customs Bulletin described below. 

Customs Bulletin 

The Customs Bulletin and Decisions (“Customs Bulletin”) is a weekly publication that 

contains decisions, rulings, regulatory proposals, notices and other information of 

interest to the trade community. It also contains decisions issued by the U.S. Court of 

International Trade, as well as customs-related decisions of the U.S. Court of Appeals 

for the Federal Circuit. Each year, the Government Printing Office publishes bound 

volumes of the Customs Bulletin. Subscriptions may be purchased from the 

Superintendent of Documents at the address and phone number listed above. 

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Classification and Marking of Pipe Fittings under Heading 7307 

February 2010 

Importing into the United States 

This publication provides an overview of the importing process and contains general 

information about import requirements. The current edition of Importing Into the United 

States contains much new and revised material brought about pursuant to the Customs 

Modernization Act (“Mod Act”). The Mod Act has fundamentally altered the relationship 

between importers and U.S. Customs and Border Protection by shifting to the importer 

the legal responsibility for declaring the value, classification, and rate of duty applicable 

to entered merchandise. 

The current edition contains a section entitled "Informed Compliance." A key component 

of informed compliance is the shared responsibility between U.S. Customs and Border 

Protection and the import community, wherein CBP communicates its requirements to 

the importer, and the importer, in turn, uses reasonable care to assure that CBP is 

provided accurate and timely data pertaining to his or her importation. 

Single copies may be obtained from local offices of U.S. Customs and Border 

Protection, or from the Office of Public Affairs, U.S. Customs and Border Protection, 

1300 Pennsylvania Avenue NW, Washington, DC 20229. An on-line version is 

available at the CBP web site. Importing into the United States is also available for 

sale, in single copies or bulk orders, from the Superintendent of Documents by calling 

(202) 512-1800, or by mail from the Superintendent of Documents, Government Printing 

Office, P.O. Box 371954, Pittsburgh, PA 15250-7054. 

Informed Compliance Publications 

U.S. Customs and Border Protection has prepared a number of Informed Compliance 

publications in the “What Every Member of the Trade Community Should Know 

About:...” series. Check the Internet web site http://www.cbp.gov for current 

publications. 

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Classification and Marking of Pipe Fittings under Heading 7307 

February 2010 

Value Publications 

Customs Valuation under the Trade Agreements Act of 1979 is a 96-page book 

containing a detailed narrative description of the customs valuation system, the customs 

valuation title of the Trade Agreements Act (§402 of the Tariff Act of 1930, as amended 

by the Trade Agreements Act of 1979 (19 U.S.C. §1401a)), the Statement of 

Administrative Action which was sent to the U.S. Congress in conjunction with the TAA, 

regulations (19 C.F.R. §§152.000-152.108) implementing the valuation system (a few 

sections of the regulations have been amended subsequent to the publication of the 

book) and questions and answers concerning the valuation system. 

Customs Valuation Encyclopedia (with updates) is comprised of relevant statutory 

provisions, CBP Regulations implementing the statute, portions of the Customs 

Valuation Code, judicial precedent, and administrative rulings involving application of 

valuation law. A copy may be purchased for a nominal charge from the Superintendent 

of Documents, Government Printing Office, P.O. Box 371954, Pittsburgh, PA 15250-

7054. This publication is also available on the Internet web site of U.S. Customs and 

Border Protection. 

The information provided in this publication is for general information 

purposes only. Recognizing that many complicated factors may be 

involved in customs issues, an importer may wish to obtain a ruling under 

CBP Regulations, 19 C.F.R. Part 177, or obtain advice from an expert 

(such as a licensed Customs Broker, attorney or consultant) who 

specializes in customs matters. Reliance solely on the general 

information in this pamphlet may not be considered reasonable care.

Additional information may also be obtained from U.S. Customs and Border Protection 

ports of entry. Please consult your telephone directory for an office near you. The 

listing will be found under U.S. Government, Department of Homeland Security. 

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Classification and Marking of Pipe Fittings under Heading 7307 

February 2010 

“Your Comments are Important” 

The Small Business and Regulatory Enforcement Ombudsman and 10 regional 

Fairness Boards were established to receive comments from small businesses about 

Federal agency enforcement activities and rate each agency’s responsiveness to small 

business. If you wish to comment on the enforcement actions of U.S. Customs and 

Border Protection, call 1-888-REG-FAIR (1-888-734-3247). 

REPORT SMUGGLING 1-800-BE-ALERT OR 1-800-NO-DROGA 

Visit our Internet web site: http://www.cbp.gov

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