Machinery HTS Classification: How Section XVI Sorts Chapters 84 and 85

How is machinery classified under HTS Section XVI?

Machinery HTS classification runs through Section XVI, which covers Chapter 84 (machinery and mechanical appliances) and Chapter 85 (electrical machinery and equipment). After the heading text, five legal notes decide most outcomes: Note 1 removes excluded goods, Note 2 sorts parts, Note 3 classifies composite machines by principal function, Note 4 classifies functional units as a whole, and Note 5 defines "machine" broadly enough to include plant, equipment and apparatus.

Why do the Section XVI notes matter more than the product description?

Because they are legal text under GRI 1, applied before any essential-character debate. The same gearbox, conveyor or control panel can land in three different subheadings depending on whether it ships alone, inside a complete line, or as part of an incomplete machine, and each subheading can carry a different MFN rate and a different Section 301 or Section 232 layer.

TL;DR: Section XVI machinery classification is an ordering problem. Check the Note 1 exclusions, then ask whether a part has its own Chapter 84 or 85 heading (Note 2(a)) before asking what machine it serves (Note 2(b)), then decide whether a multi-component system is a composite machine (Note 3) or a functional unit (Note 4). For a plant engineering team importing one production line plus 300 to 500 spare-part SKUs a year, each of those calls sets the duty on every repeat entry. GingerControl is a trade compliance AI platform, and its HTS Classification Researcher runs that order with GRI reasoning and CROSS rulings read during the analysis, not pasted on afterwards. Rates below are from HTS Revision 20 (2026), in effect from September 28, 2026, retrieved October 8, 2026.

Last updated: October 2026

What does Section XVI cover, and what does Note 1 exclude?

Section XVI is titled "Machinery and mechanical appliances; electrical equipment; parts thereof; sound recorders and reproducers, television image and sound recorders and reproducers, and parts and accessories of such articles." Chapter 84 holds machines defined mostly by what they do: pumps, compressors, machine tools, conveyors, industrial robots, packaging machinery. Chapter 85 holds electrical goods: motors and generators, transformers, switchgear, magnets, telecom and audio-visual apparatus.

Note 1 is the gate. It removes goods from the Section even when they are bought for a machine. Three exclusions to check first:

• Note 1(g): "Parts of general use, as defined in note 2 to section XV, of base metal (section XV), or similar goods of plastics (chapter 39)." Bolts, screws, springs and similar hardware stay in their base-metal headings.
• Note 1(k): "Articles of chapter 82 or 83." In CBP ruling N351254 (July 28, 2025), lawn mower blades went to 8208.40.3000 under this note, not to the mower's parts line.
• Note 1(m): "Articles of chapter 90." Measuring, checking and optical instruments leave Section XVI even when they sit on a production line.

How do you classify parts of machines under Note 2?

Note 2 is a three-step sort, and the order is the rule. The text, from Section XVI of the HTS:

"(a) Parts which are goods included in any of the headings of chapter 84 or 85 (other than headings 8409, 8431, 8448, 8466, 8473, 8487, 8503, 8522, 8529, 8538 and 8548) are in all cases to be classified in their respective headings; (b) Other parts, if suitable for use solely or principally with a particular kind of machine, or with a number of machines of the same heading (including a machine of heading 8479 or 8543) are to be classified with the machines of that kind or in heading 8409, 8431, 8448, 8466, 8473, 8503, 8522, 8529 or 8538 as appropriate."

Note 2(c) catches everything else: the parts headings "as appropriate or, failing that, in heading 8487 or 8548."

What this means in practice:

1. Does the part have its own heading? Valves (8481), bearings (8482), gearboxes and transmission shafts (8483), motors (8501), switchgear and control panels (8535 to 8537) are named goods. Under Note 2(a) they stay there "in all cases," regardless of the machine they will go into.
2. If not, is it dedicated to one kind of machine? A deck housing for a mower, a boom section for a crane, a tool holder for a machining center: Note 2(b) sends these to the machine's own parts line, such as 8431 for lifting and handling machinery or 8466 for machine tools.
3. If neither, it is a general machinery part. Note 2(c) sends it to the parts headings or, failing those, to residual 8487 or 8548.

CBP ruling N360918 (May 14, 2026) shows step 1 overriding end use. The requester argued that a shaft and a tappet gear assembly specially designed for a transformer's on-load tap changer were parts of electrical apparatus in 8538.90.8180. CBP disagreed: "Shafts designed for power transmission are specifically provided for under heading 8483," and the gear assembly with cam switches was described in heading 8537. The shaft took 8483.10.5000, Free, against 3.5 percent on the proposed 8538.90.81 line in Revision 20. The tappet assembly took 8537.20.0040 at 2.7 percent.

Quotable insight: In Section XVI, a part's end use is the last question, not the first. Note 2(a) asks whether the article already has its own Chapter 84 or 85 heading before anyone asks which machine it serves, and a "specially designed for" argument cannot override it. Catalogs that classify spare parts by the parent machine run the sort backwards, and the error repeats on every replenishment order, in both directions.

The BOM classification governance guide covers how to write that order into an item-master policy.

When does a composite machine or a functional unit take one code?

Notes 3 and 4 both collapse several machines into one classification, but they ask different questions.

Note 3, composite machines: "composite machines consisting of two or more machines fitted together to form a whole and other machines designed for the purpose of performing two or more complementary or alternative functions are to be classified as if consisting only of that component or as being that machine which performs the principal function."

CBP ruling N361808 (June 16, 2026) applied it to a magnetic article sorting system: overhead magnet, conveyor, hopper, chutes and controls. "The principal function of the MASS is the separation or sorting of ferrous metal from mixed material streams, which falls in heading 8479," at 8479.89.9599 and 2.5 percent. The conveyor did not pull it into 8428.

Note 4, functional units: "Where a machine (including a combination of machines) consists of individual components (whether separate or interconnected by piping, by transmission devices, by electric cables or by other devices) intended to contribute together to a clearly defined function covered by one of the headings in chapter 84 or chapter 85, then the whole falls to be classified in the heading appropriate to that function."

CBP ruling H305598 (December 18, 2024) classified a corrugating line (facers, reel stands, splicers, preheaters, glue machines, slitter scorers, stackers and a control system) in 8441.80.00, Free, as one functional unit when entered in a single shipment. CBP relied on the Explanatory Note limit that the unit "excludes machines or appliances fulfilling auxiliary functions." The ruling also held that three Chinese-made components, combined with the line in Germany and shipped from there, were not subject to Section 301 duties when entered as part of the unit. That holding rests on its own facts, and CBP said so.

Note 4 works at small scale too. CBP ruling H258774 (November 10, 2015) granted a protest and classified a pneumatic cylinder actuator imported with its electro-pneumatic positioner together in 8412.31.0080, because "neither component can fulfill its function without the other."

One limit: a functional unit is assessed in its condition as imported. In CBP ruling HQ 953271 (March 12, 1993), mower transmission shafts imported alone could not borrow Note 4 from the finished mower: "the functional unit note, as it applies to the mower, is irrelevant to the instant case." Note 2(a) put them in 8483.

For the consumer-electronics version of Note 3, where smart speakers and watches fight across 8517, 8518 and 8528, see the multifunction electronic device guide. When Note 3 does not resolve a case, GRI 3(b) and the Carborundum essential-character factors come next.

Section XVI notes at a glance, with the rulings that apply them

Note	What it decides	CROSS example	Outcome
Note 1	Goods excluded from Section XVI, such as general-use hardware, Chapter 82 tools, Chapter 90 instruments	N351254 (2025)	Mower blades to 8208.40.3000
Note 2(a)	A part with its own Chapter 84 or 85 heading stays there	N360918 (2026)	Tap changer shaft to 8483.10.5000, Free
Note 2(b)	Other parts dedicated to one kind of machine go with that machine	N351254 (2025)	Mower deck and handle set to 8433.90.1090
Note 2(c)	All remaining parts	Note text	Parts headings, failing that 8487 or 8548
Note 3	Composite and multi-function machines take the principal function	N361808 (2026)	Magnetic sorting system to 8479.89.9599, 2.5%
Note 4	Separate components with one clearly defined function classify as a whole	H305598 (2024)	Corrugating line to 8441.80.00, Free
Note 5	"Machine" includes machinery, plant, equipment, apparatus or appliance	H258774 (2015)	Actuator and positioner treated as machines for Note 4

Bottom line: For a manufacturer importing a production line plus a few hundred spare-part SKUs a year, the notes are applied in order, and the ruling column shows each one changing a real outcome. A CROSS ruling binds only its own facts, so use these to understand the reasoning, then test your own goods against the note text.

Chapter 84 or Chapter 85: where is the boundary?

Electric power alone does not move a machine into Chapter 85. Many Chapter 84 headings include electric versions in their own text: 8425.11.00 covers hoists "Powered by electric motor," and heading 8419 covers process machinery "whether or not electrically heated." Chapter 85 carries goods whose function is electrical in itself, plus a short list of named appliances.

The notes draw the line in four places:

• Domestic appliances. Note 1(e) and (f) to Chapter 84 exclude vacuum cleaners of 8508 and electromechanical domestic appliances of 8509. Note 4 to Chapter 85 limits 8509 to listed machines and others not exceeding 20 kg, and sends dishwashers to 8422 and household washing machines to 8450.
• Machines with a computer inside. Note 6(E) to Chapter 84: machines "incorporating or working in conjunction with an automatic data processing machine and performing a specific function other than data processing are to be classified in the headings appropriate to their respective functions or, failing that, in residual headings." A CNC lathe is a lathe. The electronics classification guide covers the 8471 side of this line.
• Semiconductor equipment. Heading 8486 is exclusive. Note 11(D) to Chapter 84 says machines answering to it "are to be classified in that heading and in no other heading," and Note 1(c) to Chapter 85 excludes them.
• Electrical components of a machine. Under Note 2(a), a motor, transformer or control panel imported alone stays in Chapter 85 even when it is built for one machine, as the tap changer assembly in N360918 did.

CBP ruling H314738 (September 17, 2024) shows the boundary inside one product family. An overband separator, a magnet with its own motorized belt, went to 8479 under Note 3 because separating metal was its principal function and the belt "performs the subsidiary function" of moving what was already separated. A permanent suspension magnet with no conveyor went to 8505.19 as a magnet. In Revision 20 that is 2.5 percent on 8479.89.95 against 4.9 percent on the 8505.19 lines.

Which tariff layers apply to Chapter 84 and 85 machinery?

The heading sets the base rate, and it also decides which Chapter 99 lists the goods appear on. CBP's machinery rulings say so directly. N361808 states it "does not address the applicability of any additional duties," including those in "Subchapter III to Chapter 99."

Layer	Where it lives	Machinery example, HTS Rev. 20 (2026)	What moves it
MFN column 1	Chapter 84 and 85 rate columns	8441.80.00 Free; 8479.89.95 2.5%; 8537.20.00 2.7%; 8505.19 lines 4.9%	Classification
Section 301, China	9903.88.01, 9903.88.02 and 9903.88.03 (+25%), 9903.88.15 (+7.5%), U.S. note 20	8433.90.10 listed in note 20(f); 8433.11.00 listed in note 20(s)	Classification and origin
Section 301 exclusions	9903.88.69 and 9903.88.70, "through November 9, 2026"	Product-specific grants under U.S. note 20(vvv) and 20(www)	Exclusion text and expiry date
Section 232 metals	9903.82.02 to 9903.82.26, U.S. note 16	8428.33.00, 8428.70.00 and 8431.39.00 on a derivative steel list; 8479.89.9599 on a derivative aluminum list	Classification, origin, metal weight
Section 301, forced labor	9903.05.20 to 9903.05.84, U.S. note 52	10 or 12.5 percent on products of 60 economies since July 24, 2026; note 52(b) exempts listed lines such as 8471, 8473.30 and 8486 goods, and note 52(f) exempts goods entered under most Section 232 metals headings	Origin, classification, Section 232 status
Other Chapter 99 measures	Subchapter III of Chapter 99	Varies by origin and date	Check the current HTS and CSMS

Bottom line: For a plant team sourcing one line from several countries, the MFN rate is often the smallest number in the stack. The heading decides which Section 301 and Section 232 lists apply, so a classification change moves every layer at once.

Three details worth checking on any machinery entry:

• Section 301 follows the subheading, and shipment configuration can change the subheading. In N351254, an electric mower deck shipped with its motor was an incomplete mower under GRI 2(a), 8433.11.0010, carrying 7.5 percent under 9903.88.15. The same deck shipped without the motor was a part under Note 2(b), 8433.90.1090, carrying 25 percent under 9903.88.03. Revision 20 still lists 8433.11.00 in note 20(s) and 8433.90.10 in note 20(f). The Section 301 exclusions guide covers the grants that expire on November 9, 2026.
• Section 232 reaches machinery as derivative steel and aluminum. U.S. note 16(c) says the 9903.82 headings "apply to the full customs value" of listed articles, but for listed articles outside chapters 72, 73, 74 and 76 they "only apply where the weight of the applicable metal is at least 15 percent of the weight of the imported article." Rates vary by list and origin. Proclamation 11032 (Federal Register, June 4, 2026) describes the April 2026 structure as 25 percent on derivative products and "a temporarily-reduced ad valorem duty of 15 percent on a subset of derivative products, namely fixed industrial machinery and power equipment." Proclamation 11032 itself, effective June 8, 2026, moved agricultural equipment and certain residential HVAC systems and components into that 15 percent category and set separate temporary rates for the articles in its Annex I-C.
• Rates in older rulings are history. HQ 953271 quoted 4 percent for 8483.10.50 in 1993; Revision 20 shows Free. Re-check every rate against the current revision.

A wrong subheading repeats on every entry of that line, and correction windows close on fixed deadlines. GingerControl identifies and documents the opportunity; your licensed broker or counsel files.

How do you classify a machine under Section XVI, step by step?

1. Fix the shipment configuration. Complete machine, complete line in one shipment, incomplete machine, or loose parts. Classification follows the condition as imported.
2. Run the Note 1 exclusions and Note 1 to Chapters 84 and 85.
3. For a part, apply Note 2 in order: own heading, then dedicated machine, then residual.
4. For a system, choose between Note 3 (principal function) and Note 4 (functional unit), and drop auxiliary equipment from any unit.
5. Apply the chapter priority rules. Note 2 to Chapter 84 puts headings 8401 to 8424 and 8486 ahead of 8425 to 8480. Note 8 sends a machine with no principal purpose described elsewhere to 8479.
6. Price the full stack on the final subheading with origin, metal content and entry date.
7. Search CROSS for rulings on the same facts and record why each applies or not.

Where this fits in your classification workflow

Section XVI work is note-driven and configuration-driven, which is where a single-pass text match on "gear assembly for transformer" goes wrong. GingerControl's HTS Classification Researcher follows GRI logic and asks clarifying questions before assigning a classification, such as how the goods ship and which components are essential to the function, and it reads relevant CROSS rulings during the analysis. GingerControl is an HTS Classification Researcher: it follows the same reasoning process a licensed customs broker uses, GRI analysis, Section and Chapter Note review and CROSS ruling research, and produces documentation that supports the classification decision. It does not provide legal advice or replace licensed customs expertise. The Tariff Calculator then breaks the duty on the result into its components: MFN, Section 301, Section 232 and other Chapter 99 lines.

References

[REF 1] U.S. International Trade Commission, Harmonized Tariff Schedule, Revision 20 (2026), Section XVI and Chapters 84, 85 and 99 Data cited: Section XVI notes 1 to 5; Chapter 84 notes 1, 2, 6(E), 8 and 11(D); Chapter 85 notes 1(c) and 4; MFN rates; headings 9903.05.20 to 9903.05.84, 9903.82, 9903.88.01 to 9903.88.03, 9903.88.15, 9903.88.69, 9903.88.70; U.S. notes 16, 20 and 52 Source: USITC HTS Published: Revision 20 effective September 28, 2026

[REF 2] U.S. Customs and Border Protection, ruling N360918 Data cited: transmission shaft to 8483.10.5000 and tappet gear assembly to 8537.20.0040 under Note 2(a) Source: CROSS ruling N360918 Published: May 14, 2026

[REF 3] U.S. Customs and Border Protection, ruling N361808 Data cited: magnetic article sorting system as a Note 3 composite machine, 8479.89.9599 Source: CROSS ruling N361808 Published: June 16, 2026

[REF 4] U.S. Customs and Border Protection, ruling N351254 Data cited: incomplete mower under GRI 2(a); deck and handle set under Note 2(b); blades under Note 1(k); Section 301 headings 9903.88.03 and 9903.88.15 Source: CROSS ruling N351254 Published: July 28, 2025

[REF 5] U.S. Customs and Border Protection, ruling H305598 Data cited: corrugating line as a Note 4 functional unit in 8441.80.00; Section 301 holding on components combined in Germany Source: CROSS ruling H305598 Published: December 18, 2024

[REF 6] U.S. Customs and Border Protection, ruling H314738 Data cited: overband separator to 8479 under Note 3; permanent suspension magnet to 8505.19 Source: CROSS ruling H314738 Published: September 17, 2024

[REF 7] U.S. Customs and Border Protection, ruling H258774 Data cited: pneumatic actuator and positioner as a Note 4 functional unit in 8412.31.0080; Note 5 definition Source: CROSS ruling H258774 Published: November 10, 2015

[REF 8] U.S. Customs and Border Protection, ruling HQ 953271 Data cited: transmission shafts imported alone classified under Note 2(a) in 8483; Note 4 not applicable Source: CROSS ruling 953271 Published: March 12, 1993

[REF 9] Proclamation 11032, Further Adjusting the Tariff Regimes for Imports of Aluminum, Steel, and Copper Into the United States Data cited: description of the Proclamation 11021 rate structure, including 15 percent on fixed industrial machinery and power equipment; expansion of the 15 percent category and Annex I-C rates effective June 8, 2026 Source: Federal Register 2026-11314 Published: June 4, 2026