--- Meta Title: HS Code for Excavator Rubber Parts: What Actually Applies Meta Description: Quick Answer: Excavator rubber parts do not all take one code. A bonded rubber-and-metal part goes as a machinery part; a plain rubber hose goes as a hose. Primary Keyword: excavator rubber parts HS code Secondary Keywords: excavator parts hs code, 8431.49 excavator parts, rubber engine mount HS code, radiator hose HS code 4009, import excavator parts china URL Slug: /blogs/news/hs-code-excavator-rubber-parts Internal Links: 9 (/pages/excavator-parts-catalog, /pages/wholesale, /pages/excavator-rubber-parts-manufacturer, /collections/excavator-engine-mounts, /collections/excavator-radiator-hoses, /blogs/news/oem-vs-aftermarket-excavator-rubber-parts, /blogs/news/measure-excavator-rubber-parts-without-a-part-number, plus 4 Reading Next) External Links: 3 (CBP rulings 959722, N309492, H344357) Word Count: ~2,520
Excavator rubber parts do not share one HS code, because the code follows what the part is rather than what it is made of. A bonded rubber-and-metal mount is generally classified as a part of the machinery it fits. A moulded rubber hose with no metal bonded into it is classified as a rubber hose. Those are different headings, and the difference decides your duty rate.
This matters more than it sounds. Assuming "rubber part, so heading 4016" is the single most common classification mistake buyers make on this product group, and in the United States it is now the wrong assumption for bonded parts.
Key Takeaways
- The pivot question is whether the part is a composite. Rubber bonded to a steel plate or a metal hub is a composite, and CBP has held that composites are not "of rubber" for classification in heading 4016.
- Bonded excavator parts generally sit in heading 8431, which covers parts suitable for use solely or principally with the machinery of headings 8425 to 8430. Excavators are heading 8429.
- Plain rubber hoses sit in heading 4009, which covers tubes, pipes and hoses of vulcanised rubber.
- CBP revoked a group of rulings in 2024 and 2025 that had classified metal-and-rubber parts under 4016. A code that was defensible a few years ago may not be now.
- The HS is six digits and every country adds its own. The importer, not the supplier, carries the liability for the code that is declared.
Why "Rubber Part" Does Not Decide the Code
Classification starts from the part, not the material list. A rubber hose, a rubber pad and a rubber mount can share a material and land in three different headings, because the tariff asks what the article is and what it is for.
Buyers running their own import paperwork tend to collapse all of this into one question: "is it rubber?" That gets you to Chapter 40, which is where hoses and plain rubber goods live, but it skips the step that decides the answer for anything with metal bonded into it.
The practical test takes about ten seconds. Look at the part and ask whether you can see steel or aluminium that is bonded to the rubber rather than merely next to it.
A bonded mount: rubber vulcanised directly onto steel plates and a stud. That bond is what moves it out of the rubber chapter.
If the metal is bonded in, you are looking at a composite article, and the classification analysis changes. If the part is rubber throughout, it stays a rubber article.
The Pivot Question: Is the Part a Composite?
This is the technical heart of the article, and it is worth reading slowly because it is where the money sits.
Customs authorities ask whether a part made of more than one material is a composite good. In a ruling issued in December 2025, CBP set out the reasoning plainly: articles made from combinations of rubber, metal and plastics "are all composite goods. As such, they are not 'of rubber' for purposes of classification in heading 4016, HTSUS, pursuant to GRI 1".
That single sentence overturns the intuition most buyers start with. If a part is not "of rubber", then the note that excludes articles of vulcanised rubber from the machinery and vehicle chapters cannot be used to push it back into Chapter 40. The part stays where its function puts it.
You can read the ruling here. It concerned automotive air springs and suspension bushings, but the reasoning about composite goods is not specific to cars, and it is the reasoning that matters for a bonded rubber mount of any kind.
Heading 8431: Parts of Excavators and Other Machinery
Excavators sit in heading 8429. Heading 8431 covers parts suitable for use solely or principally with the machinery of headings 8425 to 8430, and its subheading 8431.49 is the one that names machinery of heading 8426, 8429 or 8430.
The United States already classifies excavator undercarriage parts here. In a 2020 ruling, replacement track rollers for a Link Belt LS2800 B excavator imported from China were classified under 8431.49.9044, and the ruling quotes the subheading in full: "Parts suitable for use solely or principally with the machinery of headings 8425 to 8430: Of machinery of heading 8426, 8429, or 8430". The rate was free of duty under 8431, with a separate Chapter 99 subheading applied for the additional duty on Chinese-origin goods. You can read that ruling here.
Rubber parts for excavators have followed the same heading. A ruling on a rubber track for excavators, tractors and tracked carriers, an outer rubber casing reinforced with steel cord and combined with metal embeds, classified the article in heading 8431 as a composite good, rather than in the rubber headings. That ruling is here.
For our range, that is the analysis that matters for engine mounts, pump coupling assemblies with metal hubs, and cab mounts. They are rubber, and they are also bonded to steel, and they are made for one family of machines and nothing else.
Heading 4009: Rubber Hoses and Tubes
A radiator hose is the part in our range where the rubber chapter is the right answer.
A moulded hose with no bonded metal: the composite analysis does not apply, so it stays a rubber article.
Heading 4009 covers tubes, pipes and hoses of vulcanised rubber, and its subheadings turn on how the hose is constructed; whether it is reinforced, and whether it is reinforced with textile or with metal. A moulded water hose with no metal bonded into its structure and no fitted couplings is classified in this family, not in 8431.
The practical consequence is that one order from us can contain goods under two different headings. If you are importing mounts and hoses together, they do not belong on the same line of your declaration, and a broker who treats the whole shipment as "rubber parts" will get half of it wrong.
Heading 4016: Articles of Rubber Alone
Heading 4016 covers other articles of vulcanised rubber, and it is where plain rubber goods with no bonded metal sit. A rubber pad, a plain cushion, a rubber plug.
It is worth being precise about this heading because it is the one buyers reach for by default. For most of an excavator rubber part range, it is the wrong destination, not because the part is not rubber, but because the part is not only rubber.
If you are ordering rubber-only goods from us with no metal bonded in, ask and we will tell you which of our items are genuinely rubber throughout, because those are the ones that belong here.
The three headings at a glance
| Heading | What it covers | What falls here from our range |
|---|---|---|
| 8431 | Parts suitable for use solely or principally with the machinery of headings 8425 to 8430, which includes excavators in 8429 | Engine mounts, cab mounts and coupling assemblies where the rubber is bonded to steel |
| 4009 | Tubes, pipes and hoses of vulcanised rubber, split by how the hose is reinforced | Moulded radiator, water and bypass hoses with no bonded metal and no fitted couplings |
| 4016 | Other articles of vulcanised rubber other than hard rubber | Plain rubber goods with no metal bonded into them |
Two cautions about reading that table. The first is that it maps our product families to the heading the analysis points at, not to a line you can declare: the national code underneath depends on the destination. The second is that the split is by construction, not by product name, which is why the same order can contain goods from two rows.
A coupling illustrates why the split is not always obvious from the name. A bare rubber coupling element with no metal is a rubber article. The same coupling supplied as an assembly, with the metal hubs already fitted and bonded, is a composite. Same product family, same machine, two different analyses, and the difference is whether the hubs ship with it.
What Changed, and Why a Code That Was Right May Not Be
Classification is not static, which is the part buyers most often get caught by.
In 2024 and 2025, CBP revoked a group of rulings that had classified metal-and-rubber air springs and suspension bushings under subheadings of 4016. The parts did not change. The reasoning did. Applying the composite-goods analysis, CBP moved them into the vehicle parts heading, where they now attract duty rather than being treated as rubber articles.
The lesson generalises past those specific products. If you are working from a code that was assigned to a similar part years ago, or from a code that a forum post or a competitor's invoice used, you are working from something that may since have been overtaken.
There is also a liability point that suppliers are often vague about. The importer of record carries the responsibility for the declared code, not the exporter. A supplier can tell you what a part is made of and what they have seen it declared as, and both of those are useful, but neither transfers the obligation.
National Lines Differ: US, EU and ASEAN
The Harmonized System gives you six digits. Every country extends them, and the extensions do not match.
The United States uses a ten-digit HTSUS. The European Union uses an eight-digit Combined Nomenclature. ASEAN countries use an eight-digit AHTN. The same goods can sit under the same six-digit international heading and under different national lines in each of those, with different duty rates and different documentary requirements.
Reading across systems is not a like-for-like exercise either. Adding zeros to a six-digit code to guess a national line is guesswork, and the national line is the one that decides your rate.
Origin matters as much as classification. Goods of Chinese origin entering the United States have carried an additional duty under Section 301 alongside the ordinary rate, reported through a separate Chapter 99 subheading. That is a separate question from the classification of the part, and it applies on top of it.
What to Send Your Broker, and What to Ask Us
A broker can only classify what they are told about. The description that gets a part classified correctly names the materials and how they are combined, not just the function.
Send:
- A description naming the materials together, in the form "rubber bonded to a steel plate and stud", rather than "rubber mount".
- A photograph of the part, which shows the metal and settles the composite question in seconds.
- The machine it fits, because the machinery heading depends on it.
- Whether there is metal bonded into the part, which is the pivot question above.
- The country of origin and the destination country, because both change the line and the rate.
Ask us for the material breakdown of anything in our range and we will give it to you, in those terms. What we cannot do is decide your classification for you: your broker and your customs authority own that call, and a supplier's opinion carries no weight with them.
That is also why our parts catalogue is organised by machine and part number rather than by tariff code. The number identifies the part. The code identifies the treatment, and that depends on where the part is going.
Frequently Asked Questions
What HS code do excavator rubber parts use?
There is no single code. Bonded rubber-and-metal parts for excavators generally fall under heading 8431 as parts of machinery, while moulded rubber hoses with no bonded metal fall under heading 4009. Plain rubber goods with no metal fall under 4016.
Is a rubber engine mount classified as rubber or as a machine part?
If the rubber is bonded to steel, it is a composite good, and the composite analysis points to the machinery heading rather than heading 4016. For excavator mounts the relevant family is 8431, whose subheading 8431.49 names machinery of headings 8426, 8429 and 8430.
What code do excavator radiator hoses use?
Heading 4009 covers tubes, pipes and hoses of vulcanised rubber. A moulded hose with no fitted couplings and no bonded metal sits in that family, not in 8431.
Does the code change if the part has metal in it?
Yes, and that is the single most important thing on this page. Metal bonded to rubber makes the article a composite good. CBP has held that composites are not "of rubber" for classification in heading 4016, which is what allows the part to be classified by what it is for rather than by its rubber content.
Can my supplier give me the HS code?
A supplier can tell you what a part is made of, which is the information you actually need. The importer of record carries the liability for the declared code, so treat any code a supplier offers as a starting point to check, not as a decision.
Do I need a different code for the EU?
Yes. The six-digit HS heading is international, but the national line is not. The EU extends to eight digits under the Combined Nomenclature, and it will differ from the ten-digit US line for the same goods.
What happens if I use the wrong code?
You may underpay or overpay duty, and the exposure is yours as importer of record rather than the supplier's. Where a shipment is significant or the classification is genuinely unclear, a binding ruling from your customs authority settles the question in advance.
Are Chinese-origin excavator parts subject to extra duty in the US?
Goods of Chinese origin entering the United States have carried an additional duty under Section 301, reported through a separate Chapter 99 subheading alongside the ordinary rate. The requirement is separate from the part's classification and applies in addition to it.
Where to Go From Here
Work out which of your parts have metal bonded into them, because that split is the classification. Bonded mounts and coupling assemblies go one way; plain hoses go another.
Do not lift a code from an old invoice or a forum post without checking it against a current ruling or your broker. This is an area where the reasoning shifted recently, and the change did not announce itself to buyers.
One boundary worth stating. This article explains how the decision is made and what to send to the person who has to make it. It is not a classification ruling, and nothing here is advice on a specific entry. If you are importing in quantity, or you are already in a dispute about a code, get a binding ruling rather than relying on a guide.
Ask us for the material breakdown of anything you are considering, and send the model and the part description with it. We will tell you what the part is made of and how the components are combined, which is the input your broker needs, and we will do it the same way on a wholesale order as on a single unit. What we make is described on our manufacturer page, and the parts themselves are listed in the catalogue.
Reading Next
- OEM vs Aftermarket Excavator Rubber Parts, on judging the parts themselves rather than the paperwork.
- How to Measure Excavator Rubber Parts Without a Part Number, for when the number is gone and you need to identify the part before classifying it.
- Excavator Hydraulic Pump Coupling Sizes, the size and family codes that identify a coupling.
- Why Your Excavator Clunks When You Shut It Down, the failure that most often sends people looking for a coupling part number.