{
  "summary": "HS code 5509.21 covers yarn (other than sewing thread) of synthetic staple fibres, not put up for retail sale, containing 85 % or more by weight of polyester staple fibres, single yarn. It sits in heading 55.09 (yarn (other than sewing thread) of synthetic staple fibres, not put up for retail sale) in chapter 55 (man-made staple fibres). Other goods of heading 55.09 are classified under 5509.11 (containing 85 % or more by weight of staple fibres of nylon or other polyamides, single yarn), 5509.12 (containing 85 % or more by weight of staple fibres of nylon or other polyamides, multiple (folded) or cabled yarn), 5509.22 (containing 85 % or more by weight of polyester staple fibres, multiple (folded) or cabled yarn), 5509.31 (containing 85 % or more by weight of acrylic or modacrylic staple fibres, single yarn) or 13 others. National tariff lines under 5509.21 are live on border.bot for the United States (1 line, also used by 1 other country).",
  "updatedAt": "2026-10-11",
  "facts": [
    {
      "label": "HS code",
      "value": "5509.21",
      "source": "border.bot release GLOBAL:hs #2"
    },
    {
      "label": "Covers",
      "value": "Yarn (other than sewing thread) of synthetic staple fibres, not put up for retail sale, containing 85 % or more by weight of polyester staple fibres, single yarn",
      "source": "border.bot release GLOBAL:hs #2"
    },
    {
      "label": "Heading",
      "value": "55.09: Yarn (other than sewing thread) of synthetic staple fibres, not put up for retail sale",
      "source": "border.bot release GLOBAL:hs #2",
      "url": "https://border.bot/hs-codes/5509"
    },
    {
      "label": "Chapter",
      "value": "55: Man-made staple fibres",
      "source": "border.bot release GLOBAL:hs #2",
      "url": "https://border.bot/hs-codes/55"
    },
    {
      "label": "Edition",
      "value": "HS2022",
      "source": "border.bot release GLOBAL:hs #2"
    },
    {
      "label": "Duty in the United States",
      "value": "See its 1 line",
      "source": null,
      "url": "https://border.bot/countries/united-states/hs-codes/550921"
    }
  ],
  "faq": [
    {
      "question": "What does HS code 5509.21 cover?",
      "answer": "HS code 5509.21 covers yarn (other than sewing thread) of synthetic staple fibres, not put up for retail sale, containing 85 % or more by weight of polyester staple fibres, single yarn."
    },
    {
      "question": "Which heading and chapter is HS code 5509.21 in?",
      "answer": "HS code 5509.21 is in heading 55.09 (yarn (other than sewing thread) of synthetic staple fibres, not put up for retail sale) in chapter 55 (man-made staple fibres)."
    },
    {
      "question": "Where are goods of heading 55.09 classified when 5509.21 doesn’t fit?",
      "answer": "Other goods of heading 55.09 are classified under 5509.11 (containing 85 % or more by weight of staple fibres of nylon or other polyamides, single yarn), 5509.12 (containing 85 % or more by weight of staple fibres of nylon or other polyamides, multiple (folded) or cabled yarn), 5509.22 (containing 85 % or more by weight of polyester staple fibres, multiple (folded) or cabled yarn), 5509.31 (containing 85 % or more by weight of acrylic or modacrylic staple fibres, single yarn) or 13 others."
    },
    {
      "question": "Which countries’ tariffs list national lines under HS code 5509.21?",
      "answer": "National tariff lines under 5509.21 are live on border.bot for the United States (1 line, also used by 1 other country)."
    }
  ],
  "sections": [
    {
      "id": "covers",
      "title": "What this code covers",
      "text": [
        "HS code 5509.21 covers yarn (other than sewing thread) of synthetic staple fibres, not put up for retail sale, containing 85 % or more by weight of polyester staple fibres, single yarn.",
        "The legal text of the subheading is “Containing 85 % or more by weight of polyester staple fibres: Single yarn”, read under “Containing 85 % or more by weight of polyester staple fibres”, in HS2022."
      ]
    },
    {
      "id": "not-covered",
      "title": "What it doesn’t cover",
      "text": [
        "Other goods of heading 55.09 are classified under 5509.11 (containing 85 % or more by weight of staple fibres of nylon or other polyamides, single yarn), 5509.12 (containing 85 % or more by weight of staple fibres of nylon or other polyamides, multiple (folded) or cabled yarn), 5509.22 (containing 85 % or more by weight of polyester staple fibres, multiple (folded) or cabled yarn), 5509.31 (containing 85 % or more by weight of acrylic or modacrylic staple fibres, single yarn) or 13 others."
      ]
    },
    {
      "id": "structure",
      "title": "How it is structured",
      "text": [
        "5509.21 is a six-digit subheading. Its first two digits, 55, are the chapter; the first four, 5509, are heading 55.09; the last two, 21, 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 5509.21 are live on border.bot for the United States (1 line, 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."
      ]
    }
  ],
  "data": {
    "type": "hs-subheading",
    "edition": "HS2022",
    "chapter": {
      "code": "55",
      "description": "Man-made staple fibres"
    },
    "heading": {
      "code": "5509",
      "description": "Yarn (other than sewing thread) of synthetic staple fibres, not put up for retail sale"
    },
    "subheading": {
      "code": "550921",
      "description": "Containing 85 % or more by weight of polyester staple fibres: Single yarn",
      "levels": [
        "Containing 85 % or more by weight of polyester staple fibres",
        "Single yarn"
      ],
      "english": null,
      "keywords": []
    },
    "siblings": [
      {
        "code": "550911",
        "description": "Containing 85 % or more by weight of staple fibres of nylon or other polyamides: Single yarn"
      },
      {
        "code": "550912",
        "description": "Containing 85 % or more by weight of staple fibres of nylon or other polyamides: Multiple (folded) or cabled yarn"
      },
      {
        "code": "550922",
        "description": "Containing 85 % or more by weight of polyester staple fibres: Multiple (folded) or cabled yarn"
      },
      {
        "code": "550931",
        "description": "Containing 85 % or more by weight of acrylic or modacrylic staple fibres: Single yarn"
      },
      {
        "code": "550932",
        "description": "Containing 85 % or more by weight of acrylic or modacrylic staple fibres: Multiple (folded) or cabled yarn"
      },
      {
        "code": "550941",
        "description": "Other yarn, containing 85 % or more by weight of synthetic staple fibres: Single yarn"
      },
      {
        "code": "550942",
        "description": "Other yarn, containing 85 % or more by weight of synthetic staple fibres: Multiple (folded) or cabled yarn"
      },
      {
        "code": "550951",
        "description": "Other yarn, of polyester staple fibres: Mixed mainly or solely with artificial staple fibres"
      },
      {
        "code": "550952",
        "description": "Other yarn, of polyester staple fibres: Mixed mainly or solely with wool or fine animal hair"
      },
      {
        "code": "550953",
        "description": "Other yarn, of polyester staple fibres: Mixed mainly or solely with cotton"
      },
      {
        "code": "550959",
        "description": "Other yarn, of polyester staple fibres: Other"
      },
      {
        "code": "550961",
        "description": "Other yarn, of acrylic or modacrylic staple fibres: Mixed mainly or solely with wool or fine animal hair"
      },
      {
        "code": "550962",
        "description": "Other yarn, of acrylic or modacrylic staple fibres: Mixed mainly or solely with cotton"
      },
      {
        "code": "550969",
        "description": "Other yarn, of acrylic or modacrylic staple fibres: Other"
      },
      {
        "code": "550991",
        "description": "Other yarn: Mixed mainly or solely with wool or fine animal hair"
      },
      {
        "code": "550992",
        "description": "Other yarn: Mixed mainly or solely with cotton"
      },
      {
        "code": "550999",
        "description": "Other yarn: Other"
      }
    ],
    "related": [],
    "previous": {
      "code": "550912",
      "description": "Containing 85 % or more by weight of staple fibres of nylon or other polyamides: Multiple (folded) or cabled yarn",
      "indexable": true
    },
    "next": {
      "code": "550922",
      "description": "Containing 85 % or more by weight of polyester staple fibres: Multiple (folded) or cabled yarn",
      "indexable": true
    },
    "schedules": [
      {
        "code": "US",
        "name": "United States",
        "slug": "united-states",
        "lines": 1,
        "members": 1
      }
    ],
    "provenance": [
      {
        "dataset": "GLOBAL:hs",
        "country": "GLOBAL",
        "kind": "hs",
        "seq": 2,
        "version": "mytraddal hs2022.csv (HS 2022)",
        "liveAt": "2026-10-11T06:04:17.693Z",
        "origin": "upload",
        "sourceUrls": []
      }
    ],
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    "size": 100,
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  "code": "550921",
  "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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}