{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "brass-tube-ks",
 "name": "Hobby brass tube (K&S), 1/16–21/32 in and 1–12 mm, telescoping",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "What sizes of K&S brass tube telescope into each other?",
 "tags": [
  "brass",
  "tube",
  "telescoping",
  "hobby",
  "rod",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "k&s brass tube sizes",
  "telescoping brass tube",
  "brass tubing chart",
  "1/8 brass tube od",
  "hobby brass tube",
  "brass tube 6mm"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 32,
 "url": "https://xemstudio.com/objects/brass-tube-ks/",
 "sheet_txt": "https://xemstudio.com/objects/brass-tube-ks/sheet.txt",
 "sheet": {
  "basis": "K&S Precision Metals round brass tube: imperial sizes in 1/32 in OD steps with .014 in (0.36 mm) wall; metric 1–12 mm OD with 0.45 mm wall",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Imperial series telescopes: each size slides inside the next 1/32 in larger (OD 1/8 → ID of 5/32 is 0.128 in). Metric series telescopes in 1 mm steps (0.45 wall leaves 0.1 mm clearance).",
   "Also sold in aluminium (.014 wall, softer) and stainless (.010–.014). Cut with a tube cutter, deburr inside or the telescope jams.",
   "Why it's here: displacer rods and push-rods (3/32 and 1/8 in), displacer bodies (telescoping 1/2 → 17/32 for a close-fit sleeve), regenerator tubes, and thermocouple sheaths on the LES engines."
  ],
  "table": {
   "columns": [
    "size",
    "od_mm",
    "wall_mm",
    "id_mm"
   ],
   "rows": [
    [
     "2/32 in",
     1.59,
     0.36,
     0.88
    ],
    [
     "3/32 in",
     2.38,
     0.36,
     1.67
    ],
    [
     "4/32 in",
     3.17,
     0.36,
     2.46
    ],
    [
     "5/32 in",
     3.97,
     0.36,
     3.26
    ],
    [
     "6/32 in",
     4.76,
     0.36,
     4.05
    ],
    [
     "7/32 in",
     5.56,
     0.36,
     4.85
    ],
    [
     "8/32 in",
     6.35,
     0.36,
     5.64
    ],
    [
     "9/32 in",
     7.14,
     0.36,
     6.43
    ],
    [
     "10/32 in",
     7.94,
     0.36,
     7.23
    ],
    [
     "11/32 in",
     8.73,
     0.36,
     8.02
    ],
    [
     "12/32 in",
     9.52,
     0.36,
     8.81
    ],
    [
     "13/32 in",
     10.32,
     0.36,
     9.61
    ],
    [
     "14/32 in",
     11.11,
     0.36,
     10.4
    ],
    [
     "15/32 in",
     11.91,
     0.36,
     11.2
    ],
    [
     "16/32 in",
     12.7,
     0.36,
     11.99
    ],
    [
     "17/32 in",
     13.49,
     0.36,
     12.78
    ],
    [
     "18/32 in",
     14.29,
     0.36,
     13.58
    ],
    [
     "19/32 in",
     15.08,
     0.36,
     14.37
    ],
    [
     "20/32 in",
     15.88,
     0.36,
     15.16
    ],
    [
     "21/32 in",
     16.67,
     0.36,
     15.96
    ],
    [
     "1 mm",
     1,
     0.45,
     0.1
    ],
    [
     "2 mm",
     2,
     0.45,
     1.1
    ],
    [
     "3 mm",
     3,
     0.45,
     2.1
    ],
    [
     "4 mm",
     4,
     0.45,
     3.1
    ],
    [
     "5 mm",
     5,
     0.45,
     4.1
    ],
    [
     "6 mm",
     6,
     0.45,
     5.1
    ],
    [
     "7 mm",
     7,
     0.45,
     6.1
    ],
    [
     "8 mm",
     8,
     0.45,
     7.1
    ],
    [
     "9 mm",
     9,
     0.45,
     8.1
    ],
    [
     "10 mm",
     10,
     0.45,
     9.1
    ],
    [
     "11 mm",
     11,
     0.45,
     10.1
    ],
    [
     "12 mm",
     12,
     0.45,
     11.1
    ]
   ]
  }
 },
 "sheet_text": "Hobby brass tube (K&S), 1/16–21/32 in and 1–12 mm, telescoping — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/brass-tube-ks/  (CC BY 4.0)\nBasis: K&S Precision Metals round brass tube: imperial sizes in 1/32 in OD steps with .014 in (0.36 mm) wall; metric 1–12 mm OD with 0.45 mm wall\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Imperial series telescopes: each size slides inside the next 1/32 in larger (OD 1/8 → ID of 5/32 is 0.128 in). Metric series telescopes in 1 mm steps (0.45 wall leaves 0.1 mm clearance).\n- Also sold in aluminium (.014 wall, softer) and stainless (.010–.014). Cut with a tube cutter, deburr inside or the telescope jams.\n- Why it's here: displacer rods and push-rods (3/32 and 1/8 in), displacer bodies (telescoping 1/2 → 17/32 for a close-fit sleeve), regenerator tubes, and thermocouple sheaths on the LES engines.\n\nsize  od_mm  wall_mm  id_mm\n2/32 in  1.59  0.36  0.88\n3/32 in  2.38  0.36  1.67\n4/32 in  3.17  0.36  2.46\n5/32 in  3.97  0.36  3.26\n6/32 in  4.76  0.36  4.05\n7/32 in  5.56  0.36  4.85\n8/32 in  6.35  0.36  5.64\n9/32 in  7.14  0.36  6.43\n10/32 in  7.94  0.36  7.23\n11/32 in  8.73  0.36  8.02\n12/32 in  9.52  0.36  8.81\n13/32 in  10.32  0.36  9.61\n14/32 in  11.11  0.36  10.4\n15/32 in  11.91  0.36  11.2\n16/32 in  12.7  0.36  11.99\n17/32 in  13.49  0.36  12.78\n18/32 in  14.29  0.36  13.58\n19/32 in  15.08  0.36  14.37\n20/32 in  15.88  0.36  15.16\n21/32 in  16.67  0.36  15.96\n1 mm  1  0.45  0.1\n2 mm  2  0.45  1.1\n3 mm  3  0.45  2.1\n4 mm  4  0.45  3.1\n5 mm  5  0.45  4.1\n6 mm  6  0.45  5.1\n7 mm  7  0.45  6.1\n8 mm  8  0.45  7.1\n9 mm  9  0.45  8.1\n10 mm  10  0.45  9.1\n11 mm  11  0.45  10.1\n12 mm  12  0.45  11.1\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- K&S Precision Metals: Round brass tube (sizes and wall) — web — K&S site terms [verify license at link] — https://ksmetals.com/collections/brass-tube\n- Wikipedia: Brass — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Brass\n- Long Earth Society: Engine builds that use these parts (videos and write-ups) — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 32 parts): https://xemstudio.com/files/hardware/brass-tube-ks/index.json\nAPI: https://xemstudio.com/api/geometry?object=brass-tube-ks\n",
 "sources": [
  {
   "publisher": "K&S Precision Metals",
   "title": "Round brass tube (sizes and wall)",
   "url": "https://ksmetals.com/collections/brass-tube",
   "formats": [
    "web"
   ],
   "license": "K&S site terms",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Brass",
   "url": "https://en.wikipedia.org/wiki/Brass",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine builds that use these parts (videos and write-ups)",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  }
 ],
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  "sheet_free": true,
  "mesh_price_usd": null,
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  "tolerance_mm": null
 },
 "related": [
  "copper-pipe-type-l-m",
  "dowel-pins-metric",
  "crank-conrod-flywheel-kit",
  "borosilicate-test-tubes"
 ],
 "faq": [
  {
   "q": "Do K&S brass tubes telescope?",
   "a": "Yes: the imperial series steps 1/32 in in OD with a .014 in wall, so each size slides into the next; the metric series steps 1 mm with a 0.45 mm wall."
  },
  {
   "q": "What is the ID of 1/8 inch K&S brass tube?",
   "a": "0.097 in (2.46 mm): 3.175 OD minus two 0.356 walls. 3/32 in tube (2.38 OD) slides inside it."
  },
  {
   "q": "Which brass tube fits a 3 mm shaft?",
   "a": "The 4 mm metric tube (3.1 mm ID) as a sleeve bearing; the 1/8 in imperial (2.46 ID) is too small."
  }
 ],
 "files_license": null,
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}