{
  "summary": "HS code 8409.91 covers suitable for use solely or principally with spark-ignition internal combustion piston engines, other than those classified in 8409.99. It sits in heading 84.09 (parts suitable for use solely or principally with the engines of heading 84.07 or 84.08) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof). Other goods of heading 84.09 are classified under 8409.10 (for aircraft engines) and 8409.99 (other, other). National tariff lines under 8409.91 are live on border.bot for the United States (11 lines, also used by 1 other country).",
  "updatedAt": "2026-10-11",
  "facts": [
    {
      "label": "HS code",
      "value": "8409.91",
      "source": "border.bot release GLOBAL:hs #2"
    },
    {
      "label": "Covers",
      "value": "Suitable for use solely or principally with spark-ignition internal combustion piston engines",
      "source": "border.bot release GLOBAL:hs #2"
    },
    {
      "label": "Heading",
      "value": "84.09: Parts suitable for use solely or principally with the engines of heading 84.07 or 84.08",
      "source": "border.bot release GLOBAL:hs #2",
      "url": "https://border.bot/hs-codes/8409"
    },
    {
      "label": "Chapter",
      "value": "84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof",
      "source": "border.bot release GLOBAL:hs #2",
      "url": "https://border.bot/hs-codes/84"
    },
    {
      "label": "Edition",
      "value": "HS2022",
      "source": "border.bot release GLOBAL:hs #2"
    },
    {
      "label": "Duty in the United States",
      "value": "See its 11 lines",
      "source": null,
      "url": "https://border.bot/countries/united-states/hs-codes/840991"
    }
  ],
  "faq": [
    {
      "question": "What does HS code 8409.91 cover?",
      "answer": "HS code 8409.91 covers suitable for use solely or principally with spark-ignition internal combustion piston engines, other than those classified in 8409.99."
    },
    {
      "question": "Which heading and chapter is HS code 8409.91 in?",
      "answer": "HS code 8409.91 is in heading 84.09 (parts suitable for use solely or principally with the engines of heading 84.07 or 84.08) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof)."
    },
    {
      "question": "Where are goods of heading 84.09 classified when 8409.91 doesn’t fit?",
      "answer": "Other goods of heading 84.09 are classified under 8409.10 (for aircraft engines) and 8409.99 (other, other)."
    },
    {
      "question": "Which countries’ tariffs list national lines under HS code 8409.91?",
      "answer": "National tariff lines under 8409.91 are live on border.bot for the United States (11 lines, also used by 1 other country)."
    }
  ],
  "sections": [
    {
      "id": "covers",
      "title": "What this code covers",
      "text": [
        "HS code 8409.91 covers suitable for use solely or principally with spark-ignition internal combustion piston engines, other than those classified in 8409.99.",
        "The legal text of the subheading is “Other: Suitable for use solely or principally with spark-ignition internal combustion piston engines”, read under “Other”, in HS2022."
      ]
    },
    {
      "id": "not-covered",
      "title": "What it doesn’t cover",
      "text": [
        "Other goods of heading 84.09 are classified under 8409.10 (for aircraft engines) and 8409.99 (other, other)."
      ]
    },
    {
      "id": "structure",
      "title": "How it is structured",
      "text": [
        "8409.91 is a six-digit subheading. Its first two digits, 84, are the chapter; the first four, 8409, are heading 84.09; the last two, 91, identify the subheading within the heading.",
        "Countries add their own digits after these six for their national tariff lines."
      ]
    },
    {
      "id": "other-countries",
      "title": "In other countries",
      "text": [
        "National tariff lines under 8409.91 are live on border.bot for the United States (11 lines, also used by 1 other country)."
      ]
    },
    {
      "id": "sources",
      "title": "Sources and updates",
      "text": [
        "The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026.",
        "This page was last updated on 11 October 2026.",
        "Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling."
      ]
    }
  ],
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    "type": "hs-subheading",
    "edition": "HS2022",
    "chapter": {
      "code": "84",
      "description": "Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof"
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    "heading": {
      "code": "8409",
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      {
        "code": "840910",
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        "code": "840999",
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        "name": "United States",
        "slug": "united-states",
        "lines": 11,
        "members": 1
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        "dataset": "GLOBAL:hs",
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        "version": "mytraddal hs2022.csv (HS 2022)",
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  "code": "840991",
  "attribution": "border.bot tariff reference (border.bot), compiled from the official publishers named on each page.",
  "terms": "https://border.bot/legal/terms",
  "notice": "Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.",
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