{
 "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": "tri-clamp-female-npt-adapters",
 "name": "Tri-clamp × female NPT adapters (22MP style): ½ to 4 in",
 "kind": "standard",
 "category": "Hardware",
 "group": "Sanitary clamp fittings",
 "year": null,
 "question": "How long is a tri-clamp to female NPT adapter?",
 "tags": [
  "adapter",
  "npt",
  "female npt",
  "22mp",
  "sanitary",
  "tri-clamp",
  "clamp fitting",
  "brewing",
  "homebrew"
 ],
 "aliases": [
  "tri clamp to female npt",
  "22mp adapter dimensions",
  "tri clamp fnpt adapter",
  "tri clamp to 1/4 npt"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 10,
 "url": "https://xemstudio.com/objects/tri-clamp-female-npt-adapters/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-female-npt-adapters/sheet.txt",
 "sheet": {
  "basis": "Face-to-end A per Dixon T22MP; tap drill and L2 per ASME B1.20.1; body Ø the larger of the tube and the Class 3000 coupling OD (Xem Studio drawing)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Clamp face one end, a female pipe thread the other, drawn as the tap-drill bore over L2 + 2 so it can be tapped. Only sizes with a published A are drawn.",
   "Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40."
  ],
  "table": {
   "columns": [
    "clamp_in",
    "npt",
    "A_in",
    "A_mm",
    "tap_drill_mm",
    "L2_mm"
   ],
   "rows": [
    [
     "½",
     "⅛",
     1.25,
     31.8,
     8.6,
     6.7
    ],
    [
     "½",
     "¼",
     1.5,
     38.1,
     11.1,
     10.2
    ],
    [
     "½",
     "¾",
     1.63,
     41.4,
     23.4,
     13.9
    ],
    [
     "¾",
     "¼",
     1.5,
     38.1,
     11.1,
     10.2
    ],
    [
     "¾",
     "¾",
     1.63,
     41.4,
     23.4,
     13.9
    ],
    [
     "1½",
     "1½",
     2.25,
     57.1,
     44,
     18.38
    ],
    [
     "2",
     "2",
     2.34,
     59.4,
     56.4,
     19.22
    ],
    [
     "2½",
     "2½",
     2.09,
     53.1,
     66.7,
     28.89
    ],
    [
     "3",
     "3",
     2.19,
     55.6,
     82.6,
     30.48
    ],
    [
     "4",
     "4",
     2.63,
     66.8,
     108,
     33.02
    ]
   ]
  }
 },
 "sheet_text": "Tri-clamp × female NPT adapters (22MP style): ½ to 4 in — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-female-npt-adapters/  (CC BY 4.0)\nBasis: Face-to-end A per Dixon T22MP; tap drill and L2 per ASME B1.20.1; body Ø the larger of the tube and the Class 3000 coupling OD (Xem Studio drawing)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Clamp face one end, a female pipe thread the other, drawn as the tap-drill bore over L2 + 2 so it can be tapped. Only sizes with a published A are drawn.\n- Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40.\n\nclamp_in  npt  A_in  A_mm  tap_drill_mm  L2_mm\n½  ⅛  1.25  31.8  8.6  6.7\n½  ¼  1.5  38.1  11.1  10.2\n½  ¾  1.63  41.4  23.4  13.9\n¾  ¼  1.5  38.1  11.1  10.2\n¾  ¾  1.63  41.4  23.4  13.9\n1½  1½  2.25  57.1  44.0  18.38\n2  2  2.34  59.4  56.4  19.22\n2½  2½  2.09  53.1  66.7  28.89\n3  3  2.19  55.6  82.6  30.48\n4  4  2.63  66.8  108.0  33.02\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Dixon: Clamp × male NPT (T21MP) and clamp × female NPT (T22MP) adapters: A per size — PDF — publisher's catalogue; dimensions cited — https://api.dixonvalve.com/en/media/1490003\n- ASME: B1.20.1 Pipe threads, general purpose (NPT): major diameter, L2, tap drill; B16.11 forged fittings (Class 3000 couplings); B36.10 Sch 40 bore — standard — ASME; dimensions are facts [verify license at link] — https://www.asme.org/codes-standards/find-codes-standards/b1-20-1-pipe-threads-general-purpose-inch\n- Rubber Fab: Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50) — PDF — maker chart; dimensions are facts [verify license at link] — https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 10 parts): https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-female-npt-adapters\n",
 "sources": [
  {
   "publisher": "Dixon",
   "title": "Clamp × male NPT (T21MP) and clamp × female NPT (T22MP) adapters: A per size",
   "url": "https://api.dixonvalve.com/en/media/1490003",
   "formats": [
    "PDF"
   ],
   "license": "publisher's catalogue; dimensions cited",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "ASME",
   "title": "B1.20.1 Pipe threads, general purpose (NPT): major diameter, L2, tap drill; B16.11 forged fittings (Class 3000 couplings); B36.10 Sch 40 bore",
   "url": "https://www.asme.org/codes-standards/find-codes-standards/b1-20-1-pipe-threads-general-purpose-inch",
   "formats": [
    "standard"
   ],
   "license": "ASME; dimensions are facts",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Rubber Fab",
   "title": "Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50)",
   "url": "https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf",
   "formats": [
    "PDF"
   ],
   "license": "maker chart; dimensions are facts",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "tri-clamp-male-npt-adapters",
  "tri-clamp-ported-end-caps",
  "tri-clamp-hose-barb-adapters"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. 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.",
 "mating": [],
 "faq": [
  {
   "q": "How long is a 1½ in tri-clamp × 1½ in FNPT adapter?",
   "a": "2.25 in (57.2 mm) face to end."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "female-npt-0.5in-x-1-8",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-0.5in-x-1-8.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-0.5in-x-1-8.stl",
   "note": "½ in clamp × ⅛ FNPT: 1.25 in face to end; tap-drill bore Ø8.6 × 8.7"
  },
  {
   "file": "female-npt-0.5in-x-1-4",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-0.5in-x-1-4.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-0.5in-x-1-4.stl",
   "note": "½ in clamp × ¼ FNPT: 1.5 in face to end; tap-drill bore Ø11.1 × 12.2"
  },
  {
   "file": "female-npt-0.5in-x-3-4",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-0.5in-x-3-4.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-0.5in-x-3-4.stl",
   "note": "½ in clamp × ¾ FNPT: 1.63 in face to end; tap-drill bore Ø23.4 × 15.9"
  },
  {
   "file": "female-npt-0.75in-x-1-4",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-0.75in-x-1-4.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-0.75in-x-1-4.stl",
   "note": "¾ in clamp × ¼ FNPT: 1.5 in face to end; tap-drill bore Ø11.1 × 12.2"
  },
  {
   "file": "female-npt-0.75in-x-3-4",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-0.75in-x-3-4.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-0.75in-x-3-4.stl",
   "note": "¾ in clamp × ¾ FNPT: 1.63 in face to end; tap-drill bore Ø23.4 × 15.9"
  },
  {
   "file": "female-npt-1.5in-x-1-1-2",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-1.5in-x-1-1-2.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-1.5in-x-1-1-2.stl",
   "note": "1½ in clamp × 1½ FNPT: 2.25 in face to end; tap-drill bore Ø44.0 × 20.4"
  },
  {
   "file": "female-npt-2in-x-2",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-2in-x-2.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-2in-x-2.stl",
   "note": "2 in clamp × 2 FNPT: 2.34 in face to end; tap-drill bore Ø56.4 × 21.2"
  },
  {
   "file": "female-npt-2.5in-x-2-1-2",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-2.5in-x-2-1-2.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-2.5in-x-2-1-2.stl",
   "note": "2½ in clamp × 2½ FNPT: 2.09 in face to end; tap-drill bore Ø66.7 × 30.9"
  },
  {
   "file": "female-npt-3in-x-3",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-3in-x-3.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-3in-x-3.stl",
   "note": "3 in clamp × 3 FNPT: 2.19 in face to end; tap-drill bore Ø82.6 × 32.5"
  },
  {
   "file": "female-npt-4in-x-4",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-4in-x-4.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-female-npt-adapters/female-npt-4in-x-4.stl",
   "note": "4 in clamp × 4 FNPT: 2.63 in face to end; tap-drill bore Ø108.0 × 35.0"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-female-npt-adapters/index.md"
}