{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "bsp-parallel-pipe-threads-g-iso-228-1",
 "name": "BSP parallel pipe threads G 1-1/4 to G 6 (ISO 228-1): pitch, major, pitch and minor diameter, class A / B limits + 6 male STEP/STL files",
 "kind": "standard",
 "category": "Tri-clamp & pipe",
 "group": "Pipe, tube & threads",
 "year": null,
 "question": "What are the dimensions of a G 1-1/4, G 2 or G 3 BSPP parallel pipe thread: TPI, pitch, major diameter, pitch diameter, minor diameter and class A limits?",
 "tags": [
  "BSPP",
  "G thread",
  "ISO 228-1",
  "BSP parallel",
  "G 2 thread",
  "G 1-1/4 thread",
  "G 3 thread",
  "pipe thread",
  "male thread envelope"
 ],
 "aliases": [
  "BSPP thread dimensions",
  "G 1-1/4 thread diameter",
  "G 1-1/2 thread diameter",
  "G 2 thread diameter",
  "G 2-1/2 thread diameter",
  "G 3 thread diameter",
  "G 4 thread diameter",
  "G 2 59.614",
  "G 1-1/4 41.910",
  "BSP parallel thread 11 TPI",
  "G thread class A class B",
  "G thread pitch diameter",
  "ISO 228 thread chart",
  "BSPP 2 inch thread",
  "BSPP 3 inch thread diameter",
  "G 5 thread",
  "G 6 thread",
  "BSPP stl",
  "BSPP step",
  "G thread vs NPT",
  "G 2 thread minor diameter"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 6,
 "url": "https://xemstudio.com/objects/bsp-parallel-pipe-threads-g-iso-228-1/",
 "sheet_txt": "https://xemstudio.com/objects/bsp-parallel-pipe-threads-g-iso-228-1/sheet.txt",
 "sheet": {
  "basis": "MachiningDoctor ISO 228-1 pages (eight sizes read individually) and the ISO 7-1 sample table for G 4 to G 6; EN 10255 tube sizes for the example stubs",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "G is the parallel (cylindrical) pipe thread of ISO 228-1 (BSPP): the seal is made by a washer, bonded seal or O-ring on the face, not by the thread. G 1-1/4 and up all have 11 threads per inch (pitch 2.309 mm). External threads come in class A and the looser class B (the pitch-diameter band is 0.18 mm wide for class A on G 1-1/4 to G 2 and 0.217 mm from G 2-1/4; class B is twice that); the internal pitch diameter runs from d2 to d2 plus the class A band.",
   "Numbers: MachiningDoctor's BSPP pages for G 1-1/4, 1-1/2, 2, 2-1/4, 2-1/2, 2-3/4, 3 and 4-1/2 (each read from its own page; the generator checks d2 = d - 1.479, d1 = d - 2.958, internal band = class A band and class B band = 2 x class A on every row). G 4, G 5 and G 6 are shown with the major, pitch and minor diameters of the ISO 7-1 sample table only (ISO 7-1 and ISO 228-1 share diameters and pitch, as Engineering ToolBox states); their class A / B limits were not read, so those cells are empty. G 1-3/4, 3-1/2 and 5-1/2 are not shown: they were not verified. One disagreement: the minor diameters from MachiningDoctor differ from the ISO 7-1 sample by 0.001 mm on some sizes (e.g. G 1-1/4: 38.953 vs 38.952).",
   "Files: 6 male envelopes for G 1-1/4, 1-1/2, 2, 2-1/2, 3 and 4. Each is a plain cylinder at the nominal major diameter (20 mm long, an EXAMPLE length) joined to an EXAMPLE EN 10255 medium tube stub (30 mm long); the tube is larger than the thread major diameter and bored through. Threads are not modelled as helices. G 1/8 to G 1 male ends are on the 'Pipe thread envelopes' page.",
   "Left out: G 1/16 to G 1 (on the existing pages), G 1-3/4, 3-1/2, 5-1/2 and the sizes above 6, the thread runout and undercut, the tapping drill column (MachiningDoctor shows a placeholder), internal-thread files."
  ],
  "table": {
   "columns": [
    "size",
    "TPI",
    "pitch P, mm",
    "major Ø d, mm",
    "pitch Ø d2, mm",
    "minor Ø d1, mm",
    "external d2 class A min, mm",
    "external d2 class B min, mm",
    "internal d2 max, mm",
    "external major min, mm",
    "source"
   ],
   "rows": [
    [
     "G 1-1/4",
     "11",
     "2.309",
     "41.91",
     "40.431",
     "38.953",
     "40.251",
     "40.071",
     "40.611",
     "41.55",
     "MachiningDoctor"
    ],
    [
     "G 1-1/2",
     "11",
     "2.309",
     "47.803",
     "46.324",
     "44.846",
     "46.144",
     "45.964",
     "46.504",
     "47.443",
     "MachiningDoctor"
    ],
    [
     "G 2",
     "11",
     "2.309",
     "59.614",
     "58.135",
     "56.657",
     "57.955",
     "57.775",
     "58.315",
     "59.254",
     "MachiningDoctor"
    ],
    [
     "G 2-1/4",
     "11",
     "2.309",
     "65.71",
     "64.231",
     "62.753",
     "64.014",
     "63.797",
     "64.448",
     "65.276",
     "MachiningDoctor"
    ],
    [
     "G 2-1/2",
     "11",
     "2.309",
     "75.184",
     "73.705",
     "72.227",
     "73.488",
     "73.271",
     "73.922",
     "74.75",
     "MachiningDoctor"
    ],
    [
     "G 2-3/4",
     "11",
     "2.309",
     "81.534",
     "80.055",
     "78.577",
     "79.838",
     "79.621",
     "80.272",
     "—",
     "MachiningDoctor"
    ],
    [
     "G 3",
     "11",
     "2.309",
     "87.884",
     "86.405",
     "84.927",
     "86.188",
     "85.971",
     "86.622",
     "—",
     "MachiningDoctor"
    ],
    [
     "G 4",
     "11",
     "2.309",
     "113.03",
     "111.551",
     "110.072",
     "—",
     "—",
     "—",
     "—",
     "ISO 7-1 sample (shared diameters); G tolerances not read"
    ],
    [
     "G 4-1/2",
     "11",
     "2.309",
     "125.73",
     "124.251",
     "122.773",
     "124.034",
     "123.817",
     "124.468",
     "125.296",
     "MachiningDoctor"
    ],
    [
     "G 5",
     "11",
     "2.309",
     "138.43",
     "136.951",
     "135.472",
     "—",
     "—",
     "—",
     "—",
     "ISO 7-1 sample (shared diameters); G tolerances not read"
    ],
    [
     "G 6",
     "11",
     "2.309",
     "163.83",
     "162.351",
     "160.872",
     "—",
     "—",
     "—",
     "—",
     "ISO 7-1 sample (shared diameters); G tolerances not read"
    ]
   ]
  }
 },
 "sheet_text": "BSP parallel pipe threads G 1-1/4 to G 6 (ISO 228-1): pitch, major, pitch and minor diameter, class A / B limits + 6 male STEP/STL files — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/bsp-parallel-pipe-threads-g-iso-228-1/  (sheet CC BY 4.0)\nBasis: MachiningDoctor ISO 228-1 pages (eight sizes read individually) and the ISO 7-1 sample table for G 4 to G 6; EN 10255 tube sizes for the example stubs\nCatalog version: 2026-10-20\n\nSizes: see table below\n- G is the parallel (cylindrical) pipe thread of ISO 228-1 (BSPP): the seal is made by a washer, bonded seal or O-ring on the face, not by the thread. G 1-1/4 and up all have 11 threads per inch (pitch 2.309 mm). External threads come in class A and the looser class B (the pitch-diameter band is 0.18 mm wide for class A on G 1-1/4 to G 2 and 0.217 mm from G 2-1/4; class B is twice that); the internal pitch diameter runs from d2 to d2 plus the class A band.\n- Numbers: MachiningDoctor's BSPP pages for G 1-1/4, 1-1/2, 2, 2-1/4, 2-1/2, 2-3/4, 3 and 4-1/2 (each read from its own page; the generator checks d2 = d - 1.479, d1 = d - 2.958, internal band = class A band and class B band = 2 x class A on every row). G 4, G 5 and G 6 are shown with the major, pitch and minor diameters of the ISO 7-1 sample table only (ISO 7-1 and ISO 228-1 share diameters and pitch, as Engineering ToolBox states); their class A / B limits were not read, so those cells are empty. G 1-3/4, 3-1/2 and 5-1/2 are not shown: they were not verified. One disagreement: the minor diameters from MachiningDoctor differ from the ISO 7-1 sample by 0.001 mm on some sizes (e.g. G 1-1/4: 38.953 vs 38.952).\n- Files: 6 male envelopes for G 1-1/4, 1-1/2, 2, 2-1/2, 3 and 4. Each is a plain cylinder at the nominal major diameter (20 mm long, an EXAMPLE length) joined to an EXAMPLE EN 10255 medium tube stub (30 mm long); the tube is larger than the thread major diameter and bored through. Threads are not modelled as helices. G 1/8 to G 1 male ends are on the 'Pipe thread envelopes' page.\n- Left out: G 1/16 to G 1 (on the existing pages), G 1-3/4, 3-1/2, 5-1/2 and the sizes above 6, the thread runout and undercut, the tapping drill column (MachiningDoctor shows a placeholder), internal-thread files.\n\nsize  TPI  pitch P, mm  major Ø d, mm  pitch Ø d2, mm  minor Ø d1, mm  external d2 class A min, mm  external d2 class B min, mm  internal d2 max, mm  external major min, mm  source\nG 1-1/4  11  2.309  41.91  40.431  38.953  40.251  40.071  40.611  41.55  MachiningDoctor\nG 1-1/2  11  2.309  47.803  46.324  44.846  46.144  45.964  46.504  47.443  MachiningDoctor\nG 2  11  2.309  59.614  58.135  56.657  57.955  57.775  58.315  59.254  MachiningDoctor\nG 2-1/4  11  2.309  65.71  64.231  62.753  64.014  63.797  64.448  65.276  MachiningDoctor\nG 2-1/2  11  2.309  75.184  73.705  72.227  73.488  73.271  73.922  74.75  MachiningDoctor\nG 2-3/4  11  2.309  81.534  80.055  78.577  79.838  79.621  80.272  —  MachiningDoctor\nG 3  11  2.309  87.884  86.405  84.927  86.188  85.971  86.622  —  MachiningDoctor\nG 4  11  2.309  113.03  111.551  110.072  —  —  —  —  ISO 7-1 sample (shared diameters); G tolerances not read\nG 4-1/2  11  2.309  125.73  124.251  122.773  124.034  123.817  124.468  125.296  MachiningDoctor\nG 5  11  2.309  138.43  136.951  135.472  —  —  —  —  ISO 7-1 sample (shared diameters); G tolerances not read\nG 6  11  2.309  163.83  162.351  160.872  —  —  —  —  ISO 7-1 sample (shared diameters); G tolerances not read\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- MachiningDoctor: BSPP (G) thread basic dimensions ISO 228-1 / ISO 228-2: G 1-1/4, 1-1/2, 2, 2-1/4, 2-1/2, 2-3/4, 3 and 4-1/2 (pitch, major, pitch and minor diameter, class A / B limits) — web — Publisher's page; dimensions are facts — https://www.machiningdoctor.com/threadinfo-bspp/?tid=4711\n- iTeh Standards: ISO 7-1:1982 sample: Table 1 basic dimensions of pipe threads (pitch, d, d2, d1) 1/16 to 6 — web — Publisher's page; dimensions are facts — https://cdn.standards.iteh.ai/samples/3583/8bb5ad0f36684c6cbebd554338fcde0d/ISO-7-1-1982.pdf\n- Engineering ToolBox: ISO 7-1 and ISO 228 pipe threads: TPI, pitch, diameters and gauge length (a) — web — Publisher's page; dimensions are facts — https://engineeringtoolbox.com/iso-threads-d_752.html\n- Valves Tubes Fittings: BS EN 10255 steel tube: nominal bore, OD and wall (light / medium / heavy) — web — Publisher's page; dimensions are facts — https://www.valvestubesfittings.com/data/pdf/steel-tube/bs-en10255-steel-tube-technical-specifications-weight-dimensions-pressure.pdf\n- Engineering ToolBox: BS 1387 steel tubes: nominal bore, OD and wall (light / medium / heavy) — web — Publisher's page; dimensions are facts — https://engineeringtoolbox.com/bs1387-steel-tubes-dimensions-d_97.html\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 6 parts): https://xemstudio.com/files/hardware/bsp-parallel-pipe-threads-g-iso-228-1/index.json\nAPI: https://xemstudio.com/api/geometry?object=bsp-parallel-pipe-threads-g-iso-228-1\n",
 "sources": [
  {
   "publisher": "MachiningDoctor",
   "title": "BSPP (G) thread basic dimensions ISO 228-1 / ISO 228-2: G 1-1/4, 1-1/2, 2, 2-1/4, 2-1/2, 2-3/4, 3 and 4-1/2 (pitch, major, pitch and minor diameter, class A / B limits)",
   "url": "https://www.machiningdoctor.com/threadinfo-bspp/?tid=4711",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "iTeh Standards",
   "title": "ISO 7-1:1982 sample: Table 1 basic dimensions of pipe threads (pitch, d, d2, d1) 1/16 to 6",
   "url": "https://cdn.standards.iteh.ai/samples/3583/8bb5ad0f36684c6cbebd554338fcde0d/ISO-7-1-1982.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Engineering ToolBox",
   "title": "ISO 7-1 and ISO 228 pipe threads: TPI, pitch, diameters and gauge length (a)",
   "url": "https://engineeringtoolbox.com/iso-threads-d_752.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Valves Tubes Fittings",
   "title": "BS EN 10255 steel tube: nominal bore, OD and wall (light / medium / heavy)",
   "url": "https://www.valvestubesfittings.com/data/pdf/steel-tube/bs-en10255-steel-tube-technical-specifications-weight-dimensions-pressure.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Engineering ToolBox",
   "title": "BS 1387 steel tubes: nominal bore, OD and wall (light / medium / heavy)",
   "url": "https://engineeringtoolbox.com/bs1387-steel-tubes-dimensions-d_97.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "bsp-taper-pipe-threads-r-rp-iso-7-1",
  "npt-thread-envelopes",
  "iso-1179-bspp-ports-and-bonded-seals",
  "npt-thread-dimensions-asme-b1-20-1",
  "pipe-plugs-npt-square-hex-socket"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no tolerance added)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/",
 "mating": [
  {
   "feature": "G male thread, major Ø d (nominal)",
   "exact": "G 1-1/4 to G 4: Ø41.910 to Ø113.030",
   "mates": "internal G thread of the same size: internal pitch diameter from d2 to d2 + band (G 2: 58.135 to 58.315), major diameter larger than the external",
   "fit": "designed",
   "files": "G-"
  },
  {
   "feature": "pitch Ø d2, class A external",
   "exact": "G 2: 57.955 to 58.135",
   "mates": "internal G thread d2 58.135 to 58.315 (MachiningDoctor ISO 228-1)",
   "fit": "designed",
   "files": "G-"
  },
  {
   "feature": "example tube stub",
   "exact": "EN 10255 medium tube OD 42.4 to 114.3",
   "mates": "plain tube of that OD (the stub is an example, see notes)",
   "fit": "designed",
   "files": "G-"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. ISO 286 equivalent: H7/p6 (locational interference) or tighter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. ISO 286 equivalent: H7/g6 or H7/h6.",
  "run": "turns or slides in use: pin in a link, rod through a guide. ISO 286 equivalent: H8/f7 (close running).",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. ISO 286 equivalent: H9/d9 (free running) or looser.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "What is the major diameter of a G 2 thread?",
   "a": "59.614 mm, 11 TPI (pitch 2.309 mm), pitch diameter 58.135 mm, minor diameter 56.657 mm; external class A pitch diameter 57.955 to 58.135 mm (MachiningDoctor)."
  },
  {
   "q": "What is the major diameter of a G 1-1/4 thread?",
   "a": "41.910 mm, 11 TPI; pitch diameter 40.431 mm; class A pitch diameter 40.251 to 40.431 mm."
  },
  {
   "q": "What is the major diameter of a G 3 thread?",
   "a": "87.884 mm, 11 TPI, pitch diameter 86.405 mm, class A 86.188 to 86.405 mm."
  },
  {
   "q": "Is G 2 the same size as R 2?",
   "a": "The diameters and pitch are the same (59.614 mm major, 11 TPI), but G is parallel and R is tapered 1:16, and G seals at a face while R seals on the thread."
  },
  {
   "q": "What is the difference between class A and class B?",
   "a": "Both external classes have the same upper pitch diameter limit; class B allows twice the tolerance band below it (0.36 mm vs 0.18 mm on G 2)."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "G-1-1-4-male-parallel-envelope-d41.91",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/bsp-parallel-pipe-threads-g-iso-228-1/G-1-1-4-male-parallel-envelope-d41.91.step",
   "stl": "https://xemstudio.com/files/hardware/bsp-parallel-pipe-threads-g-iso-228-1/G-1-1-4-male-parallel-envelope-d41.91.stl",
   "note": "G 1-1/4 male parallel thread (ISO 228-1) envelope: cylinder at the nominal major diameter Ø41.91, 20 mm long (EXAMPLE thread length, our choice); then an EXAMPLE EN 10255 medium tube stub OD Ø42.4 x 3.25 wall, 30 mm long; bore Ø35.9 through; the thread is a smooth cylinder, not helical"
  },
  {
   "file": "G-1-1-2-male-parallel-envelope-d47.803",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/bsp-parallel-pipe-threads-g-iso-228-1/G-1-1-2-male-parallel-envelope-d47.803.step",
   "stl": "https://xemstudio.com/files/hardware/bsp-parallel-pipe-threads-g-iso-228-1/G-1-1-2-male-parallel-envelope-d47.803.stl",
   "note": "G 1-1/2 male parallel thread (ISO 228-1) envelope: cylinder at the nominal major diameter Ø47.803, 20 mm long (EXAMPLE thread length, our choice); then an EXAMPLE EN 10255 medium tube stub OD Ø48.3 x 3.25 wall, 30 mm long; bore Ø41.8 through; the thread is a smooth cylinder, not helical"
  },
  {
   "file": "G-2-male-parallel-envelope-d59.614",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/bsp-parallel-pipe-threads-g-iso-228-1/G-2-male-parallel-envelope-d59.614.step",
   "stl": "https://xemstudio.com/files/hardware/bsp-parallel-pipe-threads-g-iso-228-1/G-2-male-parallel-envelope-d59.614.stl",
   "note": "G 2 male parallel thread (ISO 228-1) envelope: cylinder at the nominal major diameter Ø59.614, 20 mm long (EXAMPLE thread length, our choice); then an EXAMPLE EN 10255 medium tube stub OD Ø60.3 x 3.65 wall, 30 mm long; bore Ø53 through; the thread is a smooth cylinder, not helical"
  },
  {
   "file": "G-2-1-2-male-parallel-envelope-d75.184",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/bsp-parallel-pipe-threads-g-iso-228-1/G-2-1-2-male-parallel-envelope-d75.184.step",
   "stl": "https://xemstudio.com/files/hardware/bsp-parallel-pipe-threads-g-iso-228-1/G-2-1-2-male-parallel-envelope-d75.184.stl",
   "note": "G 2-1/2 male parallel thread (ISO 228-1) envelope: cylinder at the nominal major diameter Ø75.184, 20 mm long (EXAMPLE thread length, our choice); then an EXAMPLE EN 10255 medium tube stub OD Ø76.1 x 3.65 wall, 30 mm long; bore Ø68.8 through; the thread is a smooth cylinder, not helical"
  },
  {
   "file": "G-3-male-parallel-envelope-d87.884",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/bsp-parallel-pipe-threads-g-iso-228-1/G-3-male-parallel-envelope-d87.884.step",
   "stl": "https://xemstudio.com/files/hardware/bsp-parallel-pipe-threads-g-iso-228-1/G-3-male-parallel-envelope-d87.884.stl",
   "note": "G 3 male parallel thread (ISO 228-1) envelope: cylinder at the nominal major diameter Ø87.884, 20 mm long (EXAMPLE thread length, our choice); then an EXAMPLE EN 10255 medium tube stub OD Ø88.9 x 4.05 wall, 30 mm long; bore Ø80.8 through; the thread is a smooth cylinder, not helical"
  },
  {
   "file": "G-4-male-parallel-envelope-d113.03",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/bsp-parallel-pipe-threads-g-iso-228-1/G-4-male-parallel-envelope-d113.03.step",
   "stl": "https://xemstudio.com/files/hardware/bsp-parallel-pipe-threads-g-iso-228-1/G-4-male-parallel-envelope-d113.03.stl",
   "note": "G 4 male parallel thread (ISO 228-1) envelope: cylinder at the nominal major diameter Ø113.03, 20 mm long (EXAMPLE thread length, our choice); then an EXAMPLE EN 10255 medium tube stub OD Ø114.3 x 4.5 wall, 30 mm long; bore Ø105.3 through; the thread is a smooth cylinder, not helical"
  }
 ],
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