HTS heading 8431 · Chapter 84
HTS 8431: Parts suitable for use solely or principally with the…
HTS heading 8431 covers parts suitable for use solely or principally with the machinery of headings 8425 to 8430. It has 10 tariff lines with a duty rate; the general (MFN) rates are Free (10 lines).
Imports may also owe Chapter 99 tariffs (Section 232, 301 or 201) depending on origin and date, plus the Merchandise Processing Fee and, by sea, the Harbor Maintenance Fee.
Rates from the 2026 HTS Revision 22, effective October 30, 2026. Source: U.S. International Trade Commission.
Tariff lines and duty rates
| HTS code | Description | General | Special | Column 2 | Estimate |
|---|---|---|---|---|---|
| 8431.10.00 | Of machinery of heading 8425 | Free | 35% | ||
| 8431.10.00.10 | Of machinery of subheading 8425.11 or 8425.19[No.] | Estimate → | |||
| 8431.10.00.90 | Other[No.] | Estimate → | |||
| 8431.20.00.00 | Of machinery of heading 8427[No.] | Free | 35% | Estimate → | |
| Of machinery of heading 8428: | |||||
| 8431.31.00 | Of passenger or freight elevators other than continuous action, skip hoists or escalators | Free | 35% | ||
| 8431.31.00.20 | Of skip hoists[No.] | Estimate → | |||
| 8431.31.00.40 | Of escalators[No.] | Estimate → | |||
| 8431.31.00.60 | Other[No.] | Estimate → | |||
| 8431.39.00 | Other | Free | 35% | ||
| 8431.39.00.10 | Of elevators and conveyors[No.] | Estimate → | |||
| Other: | |||||
| 8431.39.00.50 | Of oil and gas field machinery[No.] | Estimate → | |||
| 8431.39.00.70 | Of the woodland log handling equipment of statistical reporting number 8428.90.0310[No.] | Estimate → | |||
| 8431.39.00.80 | Other[No.] | Estimate → | |||
| Of machinery of heading 8426, 8429 or 8430: | |||||
| 8431.41.00 | Buckets, shovels, grabs and grips | Free | 35% | ||
| 8431.41.00.20 | Shovel attachments[No.] | Estimate → | |||
| 8431.41.00.40 | Clamshell (grappler) attachments[No.] | Estimate → | |||
| 8431.41.00.60 | Dragline buckets[No.] | Estimate → | |||
| 8431.41.00.80 | Other[No.] | Estimate → | |||
| 8431.42.00.00 | Bulldozer or angledozer blades[No.] | Free | 35% | Estimate → | |
| 8431.43 | Parts for boring or sinking machinery of subheading 8430.41 or 8430.49: | ||||
| 8431.43.40.00 | Of offshore oil and natural gas drilling and production platforms[No.] | Free | 45% | Estimate → | |
| 8431.43.80 | Other | Free | 35% | ||
| Of oil and gas field machinery: | |||||
| 8431.43.80.20 | Tool joints, whether or not forged[No.] | Estimate → | |||
| 8431.43.80.40 | Drill pipe fitted with tool joints[No.] | Estimate → | |||
| 8431.43.80.60 | Other[No.] | Estimate → | |||
| 8431.43.80.90 | Of other boring or sinking machinery[No.] | Estimate → | |||
| 8431.49 | Other: | ||||
| 8431.49.10 | Of machinery of heading 8426 | Free | 35% | ||
| 8431.49.10.10 | Of machinery of subheadings 8426.11, 8426.19 and 8426.30[No.] | Estimate → | |||
| 8431.49.10.60 | Of mobile lifting frames, straddle carriers and works trucks fitted with a crane[No.] | Estimate → | |||
| Other: | |||||
| 8431.49.10.70 | Of copper or copper alloys[No.] | Estimate → | |||
| 8431.49.10.80 | Other[No.] | Estimate → | |||
| 8431.49.90 | Other | Free | 35% | ||
| Attachments for mounting on machinery: | |||||
| 8431.49.90.05 | Backhoe attachments[No.] | Estimate → | |||
| 8431.49.90.10 | Front-end loader attachments[No.] | Estimate → | |||
| 8431.49.90.15 | Rippers and rooters[No.] | Estimate → | |||
| 8431.49.90.20 | Other[No.] | Estimate → | |||
| Other: | |||||
| Parts of coal or rock cutters and tunneling machinery: | |||||
| 8431.49.90.25 | Cast axle housings[No.] | Estimate → | |||
| Other: | |||||
| 8431.49.90.32 | Of copper or copper alloys[No.] | Estimate → | |||
| 8431.49.90.34 | Other[No.] | Estimate → | |||
| Parts of backhoes, shovels, clamshells and draglines: | |||||
| 8431.49.90.35 | Cast axle housings[No.] | Estimate → | |||
| Other: | |||||
| 8431.49.90.36 | Road wheels[No.] | Estimate → | |||
| 8431.49.90.38 | Wheel and tire assemblies[No.] | Estimate → | |||
| Other: | |||||
| 8431.49.90.39 | Of copper or copper alloys[No.] | Estimate → | |||
| 8431.49.90.41 | Other[No.] | Estimate → | |||
| Other: | |||||
| 8431.49.90.45 | Scraper bowls for scrapers of subheadings 8429.30 and 8430.69.01[No.] | Estimate → | |||
| 8431.49.90.50 | Track links[No.] | Estimate → | |||
| 8431.49.90.55 | Cast axle housings[No.] | Estimate → | |||
| Other: | |||||
| 8431.49.90.81 | Steel forgings[kg] | Estimate → | |||
| Other: | |||||
| 8431.49.90.84 | Road wheels[No.] | Estimate → | |||
| 8431.49.90.90 | Wheel and tire assemblies[No.] | Estimate → | |||
| Other: | |||||
| 8431.49.90.92 | Of copper or copper alloys[No.] | Estimate → | |||
| 8431.49.90.94 | Other[No.] | Estimate → |
51 lines shown. Statistical suffixes (the last two digits) inherit the rate of the 8-digit subheading above them.
Example: base duty and fees on $10000
For HTS 8431.10.00 at the general rate of Free, shipped by ocean, before any Chapter 99 tariffs:
| Base duty (Free) | $0.00 |
| Merchandise Processing Fee (0.3464%, min $34.58) | $34.64 |
| Harbor Maintenance Fee (0.125%) | $12.50 |
| Duty and fees | $47.14 |
Origin-specific tariffs can multiply this. Run this example from China or from Mexico to see every line.
Frequently asked questions
What is the duty rate for HTS 8431?
Heading 8431 has 10 rate lines. The general (MFN) duty rates are Free (10 lines). Products of free trade agreement partners may enter at the special rate, and Column 2 rates apply to countries without normal trade relations. Chapter 99 tariffs can be added on top: calculate the full amount.
Do Section 301, 232 or 201 tariffs apply to HTS 8431?
It depends on the 8- or 10-digit subheading, the country of origin, the entry date and, for Section 232, the metal content. These additional duties are listed in Chapter 99 of the HTS. The free duty calculator checks each program for a given code, origin and date and shows which apply and why.
What fees are added to an import under HTS 8431?
Formal entries pay the Merchandise Processing Fee of 0.3464% of value (minimum $34.58, maximum $670.86 in FY2027). Ocean shipments also pay the Harbor Maintenance Fee of 0.125% of value. See the import duty calculator for how they combine.