{
 "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": "hex-nuts-inch-7-8-to-1-1-2-jam-heavy",
 "name": "Hex nuts, hex jam nuts and heavy hex nuts, inch 7/8 to 1-1/2 (ASME B18.2.2): across flats, thickness, UNC / UNF",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What are the across-flats width and thickness of a 7/8 to 1-1/2 inch hex nut, jam nut or heavy hex nut?",
 "tags": [
  "hex nut",
  "jam nut",
  "heavy hex nut",
  "ASME B18.2.2",
  "lock nut",
  "thin nut",
  "7/8 nut",
  "1 inch nut",
  "1-1/2 nut",
  "inch nut"
 ],
 "aliases": [
  "7/8 nut wrench size",
  "1 inch nut size",
  "1-1/8 nut wrench size",
  "heavy hex nut dimensions",
  "jam nut thickness",
  "1-1/4 jam nut",
  "7/8 jam nut dimensions",
  "1-1/2 heavy hex nut",
  "heavy hex jam nut",
  "asme b18.2.2 hex nut table",
  "7/8-9 nut across flats",
  "1 inch heavy hex nut wrench"
 ],
 "overall_mm": {
  "length": 66,
  "width": 57.15,
  "height": 38.227
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 24,
 "url": "https://xemstudio.com/objects/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/",
 "sheet_txt": "https://xemstudio.com/objects/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/sheet.txt",
 "sheet": {
  "basis": "ASME B18.2.2 values as printed by Torqbolt (hex nuts), AFT Fasteners (jam, heavy hex, heavy hex jam) and Boltport (heavy hex nuts, cross-check); inches, max / min; 24 envelope files",
  "overall_mm": {
   "length": 66,
   "width": 57.15,
   "height": 38.227
  },
  "notes": [
   "Four nut types are tabled, 7/8 to 1-1/2 in. Hex nut: F max 1.312, 1.500, 1.688, 1.875, 2.062, 2.250 in; thickness H max .776, .887, .999, 1.094, 1.206, 1.317 in. Hex jam nut: same F, thinner (H max .510 to .880 in). Heavy hex nut: wider F (1.438 to 2.375 in) and thicker (H max .885 to 1.505 in). Heavy hex jam nut: heavy-hex width with the same thickness as the regular jam nut. The existing page hex-nuts-inch covers #4-40 to 3/4-10 regular nuts.",
   "Cross-checks: the regular nut F and G equal the cap-screw head F and G on hex-cap-screws-heavy-hex-screws-inch-7-8-to-1-1-2 at every size, and heavy-hex F and G equal the heavy hex screw head. Heavy hex nut values are the same on two independent sites (AFT and Boltport). The regular hex nut thickness comes from a single table (Torqbolt, whose column headings were misaligned: the H min / max assignment is read from the values), and the jam-nut table from AFT's reprint of the 1987 standard. AFT also lists the UNC threads per inch for heavy jam nuts (9, 8, 7, 7, 6) and the 1 in jam row matches fasten.it Table 10 (H1 .519 / .575).",
   "One disagreement, shown rather than averaged: fasten.it Table 9 ('heavy hex flat nuts and flat jam nuts') prints H max 1.155, 1.282, 1.409, 1.536 in and H1 max .655, .782, .846, .911 in for 1-1/8 to 1-1/2, while AFT and Boltport print 1.139, 1.251, 1.378, 1.505 (heavy nut) and .639, .751, .815, .880 (jam). Their H min and H1 min values agree. The files and table use the AFT / Boltport numbers.",
   "Threads: UNC 9, 8, 7, 7, 6, 6 and UNF 14, 12, 12, 12, 12, 12 threads per inch (threaded-rod-inch-unc-unf-sizes). The files draw a plain bore at the thread major diameter, a hexagonal prism at F max and H max. No chamfer, washer face or thread is drawn. Not covered: hex thick nuts, nylon-insert (see nylon-insert-lock-nuts-inch-asme-b18-16-6) and flange nuts."
  ],
  "table": {
   "columns": [
    "type",
    "size (in)",
    "UNC / UNF TPI",
    "F across flats max / min",
    "G across corners max / min",
    "H thickness max / min",
    "source",
    "file: F max / H max (mm)"
   ],
   "rows": [
    [
     "hex nut",
     "7/8",
     "9 / 14",
     "1.312 / 1.269",
     "1.516 / 1.447",
     ".776 / .724",
     "Torqbolt",
     "33.32 / 19.71"
    ],
    [
     "hex nut",
     "1",
     "8 / 12",
     "1.500 / 1.450",
     "1.732 / 1.653",
     ".887 / .831",
     "Torqbolt",
     "38.1 / 22.53"
    ],
    [
     "hex nut",
     "1-1/8",
     "7 / 12",
     "1.688 / 1.631",
     "1.949 / 1.859",
     ".999 / .939",
     "Torqbolt",
     "42.88 / 25.37"
    ],
    [
     "hex nut",
     "1-1/4",
     "7 / 12",
     "1.875 / 1.812",
     "2.165 / 2.066",
     "1.094 / 1.030",
     "Torqbolt",
     "47.62 / 27.79"
    ],
    [
     "hex nut",
     "1-3/8",
     "6 / 12",
     "2.062 / 1.994",
     "2.382 / 2.273",
     "1.206 / 1.138",
     "Torqbolt",
     "52.37 / 30.63"
    ],
    [
     "hex nut",
     "1-1/2",
     "6 / 12",
     "2.250 / 2.175",
     "2.598 / 2.480",
     "1.317 / 1.245",
     "Torqbolt",
     "57.15 / 33.45"
    ],
    [
     "hex jam nut",
     "7/8",
     "9 / 14",
     "1.312 / 1.269",
     "1.516 / 1.447",
     ".510 / .458",
     "AFT 1987",
     "33.32 / 12.95"
    ],
    [
     "hex jam nut",
     "1",
     "8 / 12",
     "1.500 / 1.450",
     "1.732 / 1.653",
     ".575 / .519",
     "AFT 1987",
     "38.1 / 14.6"
    ],
    [
     "hex jam nut",
     "1-1/8",
     "7 / 12",
     "1.688 / 1.631",
     "1.949 / 1.859",
     ".639 / .579",
     "AFT 1987",
     "42.88 / 16.23"
    ],
    [
     "hex jam nut",
     "1-1/4",
     "7 / 12",
     "1.875 / 1.812",
     "2.165 / 2.066",
     ".751 / .687",
     "AFT 1987",
     "47.62 / 19.08"
    ],
    [
     "hex jam nut",
     "1-3/8",
     "6 / 12",
     "2.062 / 1.994",
     "2.382 / 2.273",
     ".815 / .747",
     "AFT 1987",
     "52.37 / 20.7"
    ],
    [
     "hex jam nut",
     "1-1/2",
     "6 / 12",
     "2.250 / 2.175",
     "2.598 / 2.480",
     ".880 / .808",
     "AFT 1987",
     "57.15 / 22.35"
    ],
    [
     "heavy hex nut",
     "7/8",
     "9 / 14",
     "1.438 / 1.394",
     "1.660 / 1.589",
     ".885 / .833",
     "AFT + Boltport",
     "36.53 / 22.48"
    ],
    [
     "heavy hex nut",
     "1",
     "8 / 12",
     "1.625 / 1.575",
     "1.876 / 1.796",
     "1.012 / .956",
     "AFT + Boltport",
     "41.27 / 25.7"
    ],
    [
     "heavy hex nut",
     "1-1/8",
     "7 / 12",
     "1.812 / 1.756",
     "2.093 / 2.002",
     "1.139 / 1.079",
     "AFT + Boltport",
     "46.02 / 28.93"
    ],
    [
     "heavy hex nut",
     "1-1/4",
     "7 / 12",
     "2.000 / 1.938",
     "2.309 / 2.209",
     "1.251 / 1.187",
     "AFT + Boltport",
     "50.8 / 31.78"
    ],
    [
     "heavy hex nut",
     "1-3/8",
     "6 / 12",
     "2.188 / 2.119",
     "2.526 / 2.416",
     "1.378 / 1.310",
     "AFT + Boltport",
     "55.58 / 35.0"
    ],
    [
     "heavy hex nut",
     "1-1/2",
     "6 / 12",
     "2.375 / 2.300",
     "2.742 / 2.622",
     "1.505 / 1.433",
     "AFT + Boltport",
     "60.32 / 38.23"
    ],
    [
     "heavy hex jam nut",
     "7/8",
     "9 / 14",
     "1.438 / 1.394",
     "1.660 / 1.589",
     ".510 / .458",
     "AFT",
     "36.53 / 12.95"
    ],
    [
     "heavy hex jam nut",
     "1",
     "8 / 12",
     "1.625 / 1.575",
     "1.876 / 1.796",
     ".575 / .519",
     "AFT",
     "41.27 / 14.6"
    ],
    [
     "heavy hex jam nut",
     "1-1/8",
     "7 / 12",
     "1.812 / 1.756",
     "2.093 / 2.002",
     ".639 / .579",
     "AFT",
     "46.02 / 16.23"
    ],
    [
     "heavy hex jam nut",
     "1-1/4",
     "7 / 12",
     "2.000 / 1.938",
     "2.309 / 2.209",
     ".751 / .687",
     "AFT",
     "50.8 / 19.08"
    ],
    [
     "heavy hex jam nut",
     "1-3/8",
     "6 / 12",
     "2.188 / 2.119",
     "2.526 / 2.416",
     ".815 / .747",
     "AFT",
     "55.58 / 20.7"
    ],
    [
     "heavy hex jam nut",
     "1-1/2",
     "6 / 12",
     "2.375 / 2.300",
     "2.742 / 2.622",
     ".880 / .808",
     "AFT",
     "60.32 / 22.35"
    ]
   ]
  }
 },
 "sheet_text": "Hex nuts, hex jam nuts and heavy hex nuts, inch 7/8 to 1-1/2 (ASME B18.2.2): across flats, thickness, UNC / UNF — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/  (sheet CC BY 4.0)\nBasis: ASME B18.2.2 values as printed by Torqbolt (hex nuts), AFT Fasteners (jam, heavy hex, heavy hex jam) and Boltport (heavy hex nuts, cross-check); inches, max / min; 24 envelope files\nCatalog version: 2026-10-20\n\nOverall (mm): length 66.0, width 57.15, height 38.227\n- Four nut types are tabled, 7/8 to 1-1/2 in. Hex nut: F max 1.312, 1.500, 1.688, 1.875, 2.062, 2.250 in; thickness H max .776, .887, .999, 1.094, 1.206, 1.317 in. Hex jam nut: same F, thinner (H max .510 to .880 in). Heavy hex nut: wider F (1.438 to 2.375 in) and thicker (H max .885 to 1.505 in). Heavy hex jam nut: heavy-hex width with the same thickness as the regular jam nut. The existing page hex-nuts-inch covers #4-40 to 3/4-10 regular nuts.\n- Cross-checks: the regular nut F and G equal the cap-screw head F and G on hex-cap-screws-heavy-hex-screws-inch-7-8-to-1-1-2 at every size, and heavy-hex F and G equal the heavy hex screw head. Heavy hex nut values are the same on two independent sites (AFT and Boltport). The regular hex nut thickness comes from a single table (Torqbolt, whose column headings were misaligned: the H min / max assignment is read from the values), and the jam-nut table from AFT's reprint of the 1987 standard. AFT also lists the UNC threads per inch for heavy jam nuts (9, 8, 7, 7, 6) and the 1 in jam row matches fasten.it Table 10 (H1 .519 / .575).\n- One disagreement, shown rather than averaged: fasten.it Table 9 ('heavy hex flat nuts and flat jam nuts') prints H max 1.155, 1.282, 1.409, 1.536 in and H1 max .655, .782, .846, .911 in for 1-1/8 to 1-1/2, while AFT and Boltport print 1.139, 1.251, 1.378, 1.505 (heavy nut) and .639, .751, .815, .880 (jam). Their H min and H1 min values agree. The files and table use the AFT / Boltport numbers.\n- Threads: UNC 9, 8, 7, 7, 6, 6 and UNF 14, 12, 12, 12, 12, 12 threads per inch (threaded-rod-inch-unc-unf-sizes). The files draw a plain bore at the thread major diameter, a hexagonal prism at F max and H max. No chamfer, washer face or thread is drawn. Not covered: hex thick nuts, nylon-insert (see nylon-insert-lock-nuts-inch-asme-b18-16-6) and flange nuts.\n\ntype  size (in)  UNC / UNF TPI  F across flats max / min  G across corners max / min  H thickness max / min  source  file: F max / H max (mm)\nhex nut  7/8  9 / 14  1.312 / 1.269  1.516 / 1.447  .776 / .724  Torqbolt  33.32 / 19.71\nhex nut  1  8 / 12  1.500 / 1.450  1.732 / 1.653  .887 / .831  Torqbolt  38.1 / 22.53\nhex nut  1-1/8  7 / 12  1.688 / 1.631  1.949 / 1.859  .999 / .939  Torqbolt  42.88 / 25.37\nhex nut  1-1/4  7 / 12  1.875 / 1.812  2.165 / 2.066  1.094 / 1.030  Torqbolt  47.62 / 27.79\nhex nut  1-3/8  6 / 12  2.062 / 1.994  2.382 / 2.273  1.206 / 1.138  Torqbolt  52.37 / 30.63\nhex nut  1-1/2  6 / 12  2.250 / 2.175  2.598 / 2.480  1.317 / 1.245  Torqbolt  57.15 / 33.45\nhex jam nut  7/8  9 / 14  1.312 / 1.269  1.516 / 1.447  .510 / .458  AFT 1987  33.32 / 12.95\nhex jam nut  1  8 / 12  1.500 / 1.450  1.732 / 1.653  .575 / .519  AFT 1987  38.1 / 14.6\nhex jam nut  1-1/8  7 / 12  1.688 / 1.631  1.949 / 1.859  .639 / .579  AFT 1987  42.88 / 16.23\nhex jam nut  1-1/4  7 / 12  1.875 / 1.812  2.165 / 2.066  .751 / .687  AFT 1987  47.62 / 19.08\nhex jam nut  1-3/8  6 / 12  2.062 / 1.994  2.382 / 2.273  .815 / .747  AFT 1987  52.37 / 20.7\nhex jam nut  1-1/2  6 / 12  2.250 / 2.175  2.598 / 2.480  .880 / .808  AFT 1987  57.15 / 22.35\nheavy hex nut  7/8  9 / 14  1.438 / 1.394  1.660 / 1.589  .885 / .833  AFT + Boltport  36.53 / 22.48\nheavy hex nut  1  8 / 12  1.625 / 1.575  1.876 / 1.796  1.012 / .956  AFT + Boltport  41.27 / 25.7\nheavy hex nut  1-1/8  7 / 12  1.812 / 1.756  2.093 / 2.002  1.139 / 1.079  AFT + Boltport  46.02 / 28.93\nheavy hex nut  1-1/4  7 / 12  2.000 / 1.938  2.309 / 2.209  1.251 / 1.187  AFT + Boltport  50.8 / 31.78\nheavy hex nut  1-3/8  6 / 12  2.188 / 2.119  2.526 / 2.416  1.378 / 1.310  AFT + Boltport  55.58 / 35.0\nheavy hex nut  1-1/2  6 / 12  2.375 / 2.300  2.742 / 2.622  1.505 / 1.433  AFT + Boltport  60.32 / 38.23\nheavy hex jam nut  7/8  9 / 14  1.438 / 1.394  1.660 / 1.589  .510 / .458  AFT  36.53 / 12.95\nheavy hex jam nut  1  8 / 12  1.625 / 1.575  1.876 / 1.796  .575 / .519  AFT  41.27 / 14.6\nheavy hex jam nut  1-1/8  7 / 12  1.812 / 1.756  2.093 / 2.002  .639 / .579  AFT  46.02 / 16.23\nheavy hex jam nut  1-1/4  7 / 12  2.000 / 1.938  2.309 / 2.209  .751 / .687  AFT  50.8 / 19.08\nheavy hex jam nut  1-3/8  6 / 12  2.188 / 2.119  2.526 / 2.416  .815 / .747  AFT  55.58 / 20.7\nheavy hex jam nut  1-1/2  6 / 12  2.375 / 2.300  2.742 / 2.622  .880 / .808  AFT  60.32 / 22.35\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Torqbolt: ASME B18.2.2 hex nuts: F, G, H min / max in mm and inches, 1/4 to 4 in (nut table read for 7/8 to 1-1/2) — web — Publisher's page; dimensions are facts — https://torqbolt.com/asme-b18-2-2-hex-nuts-dimensions-standards-specifications\n- AFT Fasteners: Hex jam nuts (ANSI/ASME B18.2.2-1987) and heavy hex jam nuts (B18.2.2-1987, R1999): F, G, H max / min — web — Publisher's page; dimensions are facts — https://www.aftfasteners.com/hex-jam-nuts-dimensions-technical-information/\n- AFT Fasteners: Heavy hex nuts (ANSI/ASME B18.2.2): F basic / max / min, G, H basic / max / min — web — Publisher's page; dimensions are facts — https://www.aftfasteners.com/heavy-hex-nuts-dimensions-technical-information/\n- Boltport (mirror host as read): ASME B18.2.2 heavy hex nuts: F, G, H basic / min / max, 1/4 to 4 in — web — Publisher's page; dimensions are facts — https://www.boltport.com.ferrobend.com/standards/asme-b18.2.2/heavy-hex-nuts\n- fasten.it: ASME B18.2.2 Table 9: heavy hex flat nuts and flat jam nuts, 1-1/8 to 4 in (G, F, H, H1) — web — Publisher's page; dimensions are facts — https://www.fasten.it/Norms/Norm/ASME_B18.2.2_TABLE_9\n- fasten.it: ASME B18.2.2 Table 10: heavy hex nuts and heavy hex jam nuts (G, F, H, H1; used here only to check the 1 in jam row) — web — Publisher's page; dimensions are facts — https://fasten.it/norms/norm/asme_b18.2.2_table_10\n- ASME: ASME B18.2.2 Nuts for general applications (inch) — web — ASME; dimensions are facts — https://www.asme.org/codes-standards/find-codes-standards/b18-2-2-nuts-for-general-applications-machine-screw-nuts-hex-square-hex-flange-coupling-nuts-(inch-series)\n- Torqbolt: ASME B18.31.3 threaded rods: nominal diameters and UNC / UNF threads per inch, #4 to 5 in — web — Publisher's page; dimensions are facts — https://torqbolt.com/asme-b18-31-3-threaded-rods-dimensions-standards-specifications\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 24 parts): https://xemstudio.com/files/hardware/hex-nuts-inch-7-8-to-1-1-2-jam-heavy/index.json\nAPI: https://xemstudio.com/api/geometry?object=hex-nuts-inch-7-8-to-1-1-2-jam-heavy\n",
 "sources": [
  {
   "publisher": "Torqbolt",
   "title": "ASME B18.2.2 hex nuts: F, G, H min / max in mm and inches, 1/4 to 4 in (nut table read for 7/8 to 1-1/2)",
   "url": "https://torqbolt.com/asme-b18-2-2-hex-nuts-dimensions-standards-specifications",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "AFT Fasteners",
   "title": "Hex jam nuts (ANSI/ASME B18.2.2-1987) and heavy hex jam nuts (B18.2.2-1987, R1999): F, G, H max / min",
   "url": "https://www.aftfasteners.com/hex-jam-nuts-dimensions-technical-information/",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "AFT Fasteners",
   "title": "Heavy hex nuts (ANSI/ASME B18.2.2): F basic / max / min, G, H basic / max / min",
   "url": "https://www.aftfasteners.com/heavy-hex-nuts-dimensions-technical-information/",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Boltport (mirror host as read)",
   "title": "ASME B18.2.2 heavy hex nuts: F, G, H basic / min / max, 1/4 to 4 in",
   "url": "https://www.boltport.com.ferrobend.com/standards/asme-b18.2.2/heavy-hex-nuts",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "fasten.it",
   "title": "ASME B18.2.2 Table 9: heavy hex flat nuts and flat jam nuts, 1-1/8 to 4 in (G, F, H, H1)",
   "url": "https://www.fasten.it/Norms/Norm/ASME_B18.2.2_TABLE_9",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "fasten.it",
   "title": "ASME B18.2.2 Table 10: heavy hex nuts and heavy hex jam nuts (G, F, H, H1; used here only to check the 1 in jam row)",
   "url": "https://fasten.it/norms/norm/asme_b18.2.2_table_10",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "ASME",
   "title": "ASME B18.2.2 Nuts for general applications (inch)",
   "url": "https://www.asme.org/codes-standards/find-codes-standards/b18-2-2-nuts-for-general-applications-machine-screw-nuts-hex-square-hex-flange-coupling-nuts-(inch-series)",
   "formats": [
    "web"
   ],
   "license": "ASME; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Torqbolt",
   "title": "ASME B18.31.3 threaded rods: nominal diameters and UNC / UNF threads per inch, #4 to 5 in",
   "url": "https://torqbolt.com/asme-b18-31-3-threaded-rods-dimensions-standards-specifications",
   "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": [
  "hex-nuts-inch",
  "hex-cap-screws-heavy-hex-screws-inch-7-8-to-1-1-2",
  "hex-bolts-inch",
  "flat-washers-inch",
  "structural-washers-astm-f436",
  "nord-lock-wedge-locking-washers",
  "nylon-insert-lock-nuts-inch-asme-b18-16-6",
  "wing-nuts-din-315-asme-b18-17",
  "threaded-rod-inch-unc-unf-sizes",
  "plain-washers-inch-type-b"
 ],
 "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": "bore (thread as plain cylinder)",
   "exact": "Ø22.225 (7/8), 25.400 (1), 28.575 (1-1/8), 31.750 (1-1/4), 34.925 (1-3/8), 38.100 (1-1/2) mm at the thread major",
   "mates": "hex cap screw or heavy hex screw of the same thread: hex-cap-screws-heavy-hex-screws-inch-7-8-to-1-1-2 (shank = E max)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "across flats F max",
   "exact": "1.312 / 1.500 / 1.688 / 1.875 / 2.062 / 2.250 in (hex, jam); 1.438 / 1.625 / 1.812 / 2.000 / 2.188 / 2.375 in (heavy)",
   "mates": "wrench or socket of that nominal across-flats size (same F as the matching screw head)",
   "fit": "designed",
   "files": "all"
  }
 ],
 "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 size wrench for a 7/8 inch nut?",
   "a": "1-5/16 in across flats for a regular hex or hex jam nut (F max 1.312 in); a heavy hex nut is 1-7/16 in (F max 1.438 in)."
  },
  {
   "q": "How thick is a 1 inch jam nut?",
   "a": "H max .575 in, H min .519 in (AFT's reprint of ASME B18.2.2-1987); a regular 1 in hex nut is .887 / .831 in."
  },
  {
   "q": "Is a heavy hex jam nut thinner than a heavy hex nut?",
   "a": "Yes: the heavy hex jam nut has the heavy-hex width but the regular jam-nut thickness, .575 in max at 1 in against 1.012 in for the full heavy hex nut."
  }
 ],
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}