{
 "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": "slotted-castle-nuts-inch-asme-b18-2-2",
 "name": "Slotted and castle nuts, inch (ASME B18.2.2): hex slotted 1/4 to 2 in, castle 1/4 to 1-1/4 in — across flats, height, slot width, cotter hole + envelope models",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What are the dimensions of a 3/8 or 1/2 inch slotted (castle) nut, and what cotter pin goes with it?",
 "tags": [
  "castle nut",
  "slotted nut",
  "castellated nut",
  "asme b18.2.2",
  "cotter pin",
  "split pin",
  "castle nut dimensions",
  "fastener"
 ],
 "aliases": [
  "castle nut dimensions inch",
  "1/2 castle nut size",
  "3/8-24 castle nut dimensions",
  "slotted hex nut dimensions",
  "castle nut cotter pin size chart",
  "5/8 castle nut across flats",
  "3/4 castle nut dimensions",
  "asme b18.2.2 slotted nut",
  "1/4-28 castle nut",
  "castle nut slot width",
  "slotted nut height chart",
  "castle nut stl"
 ],
 "overall_mm": {
  "length": 12.8,
  "width": 11.1,
  "height": 5.6
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 8,
 "url": "https://xemstudio.com/objects/slotted-castle-nuts-inch-asme-b18-2-2/",
 "sheet_txt": "https://xemstudio.com/objects/slotted-castle-nuts-inch-asme-b18-2-2/sheet.txt",
 "sheet": {
  "basis": "AFT Fasteners' ASME B18.2.2 hex slotted nut and castle nut tables (Engineers Edge and a Shopify-hosted castle sheet as cross-checks), McMaster-Carr's slotted-nut table for the cotter pin hole; eight envelope models as files",
  "overall_mm": {
   "length": 12.8,
   "width": 11.1,
   "height": 5.6
  },
  "notes": [
   "Hex slotted nuts (AFT, citing ANSI / ASME B18.2.2), inches, 1/4 to 2: width across flats F (basic, then max / min), width across corners G max / min, thickness H (basic, then max / min), unslotted thickness T (max / min), slot width S (max / min). AFT's flattened table was read by header order, so check the standard if a figure matters. Engineers Edge prints the same F, H (as a decimal), T and S for the sizes it lists (1/4 and 3/4 to 1-1/2 read). Threads UNC, UNF or 8UN; steel nuts to ASTM A563 grade A or SAE J995 grade 2 unless specified (Engineers Edge).",
   "Hex castle nuts (AFT, ANSI B18.2.2-1970 column, 1/4 to 1-1/4): the slots are cut in a cylinder whose diameter W (minimum) is a little under the hex width, with a fillet R at its base. T is the height of the hex part (basic, then max / min). The AFT page labels its last castle row '1-1/4' but prints a major diameter of 1.1250 beside it; the row's F of 1-7/8 matches the 1-1/4 slotted nut, so it is shown as 1-1/4. The castle slot widths equal the slotted-nut S for the same size. A Shopify-hosted castle sheet prints the same numbers with other column labels. AFT says the castle values for Grade 5 nuts are recommendations, not an industry norm.",
   "Cotter pin hole diameter per McMaster-Carr (inches): Grade 5 slotted nuts and, separately, low-strength steel slotted nuts differ from 7/16 up (for example 1/2: 7/64 and 1/8; 7/8: 3/16 and 5/32; 1-1/4: 5/16 and 9/32). Both are shown; use the pin hole of the nut you buy. McMaster's Grade 5 heights differ from AFT's basic H in two places: 7/8 (McMaster 49/64, AFT basic 3/4; McMaster's low-strength nut is 3/4) and 1-1/4 (McMaster 1-3/32 = 1.094, AFT basic 1-1/16, AFT max 1.094); AFT's max / min brackets both values.",
   "Files are Xem-drawn envelopes: hex at the basic width across flats and basic height, six slots (three straight cuts 60° apart) of the maximum published slot width S to the unslotted thickness (slotted nuts: T max, castle nuts: T basic); the castle collar is a plain cylinder at W min. The bore is a plain cylinder at the nominal thread major diameter; no chamfer, no washer face, no fillet R. Sizes drawn: slotted 1/4, 3/8, 1/2, 5/8, 3/4; castle 1/4, 1/2, 3/4.",
   "McMaster-Carr sells slotted hex nuts and castellated nuts with per-part STEP; the categories are linked, not copied. Metric: slotted-castle-nuts-din-935."
  ],
  "table": {
   "columns": [
    "type",
    "size (in)",
    "F basic",
    "F max / min",
    "G max / min",
    "H basic",
    "H max / min",
    "T (unslotted thickness)",
    "S slot width max / min",
    "W min (castle collar dia)",
    "R (castle fillet)",
    "cotter pin hole, Grade 5 (McMaster, in)",
    "cotter pin hole, low-strength (McMaster, in)"
   ],
   "rows": [
    [
     "hex slotted nut (ASME B18.2.2)",
     "1/4",
     "7/16",
     "0.438 / 0.428",
     "0.505 / 0.488",
     "7/32",
     "0.226 / 0.212",
     "0.14 / 0.12",
     "0.10 / 0.07",
     "—",
     "—",
     "1/16",
     "1/16"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "5/16",
     "1/2",
     "0.500 / 0.489",
     "0.577 / 0.557",
     "17/64",
     "0.273 / 0.258",
     "0.18 / 0.16",
     "0.12 / 0.09",
     "—",
     "—",
     "5/64",
     "5/64"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "3/8",
     "9/16",
     "0.562 / 0.551",
     "0.650 / 0.628",
     "21/64",
     "0.337 / 0.320",
     "0.21 / 0.19",
     "0.15 / 0.12",
     "—",
     "—",
     "7/64",
     "7/64"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "7/16",
     "11/16",
     "0.688 / 0.675",
     "0.794 / 0.768",
     "3/8",
     "0.385 / 0.365",
     "0.23 / 0.21",
     "0.15 / 0.12",
     "—",
     "—",
     "7/64",
     "3/32"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "1/2",
     "3/4",
     "0.750 / 0.736",
     "0.866 / 0.840",
     "7/16",
     "0.448 / 0.427",
     "0.29 / 0.27",
     "0.18 / 0.15",
     "—",
     "—",
     "7/64",
     "1/8"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "9/16",
     "7/8",
     "0.875 / 0.861",
     "1.010 / 0.982",
     "31/64",
     "0.496 / 0.473",
     "0.31 / 0.29",
     "0.18 / 0.15",
     "—",
     "—",
     "9/64",
     "7/64"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "5/8",
     "15/16",
     "0.938 / 0.922",
     "1.083 / 1.051",
     "35/64",
     "0.559 / 0.535",
     "0.34 / 0.32",
     "0.24 / 0.18",
     "—",
     "—",
     "5/32",
     "5/32"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "3/4",
     "1-1/8",
     "1.125 / 1.088",
     "1.299 / 1.240",
     "41/64",
     "0.665 / 0.617",
     "0.40 / 0.38",
     "0.24 / 0.18",
     "—",
     "—",
     "5/32",
     "5/32"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "7/8",
     "1-5/16",
     "1.312 / 1.269",
     "1.516 / 1.447",
     "3/4",
     "0.776 / 0.724",
     "0.52 / 0.49",
     "0.24 / 0.18",
     "—",
     "—",
     "3/16",
     "5/32"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "1",
     "1-1/2",
     "1.500 / 1.450",
     "1.732 / 1.653",
     "55/64",
     "0.887 / 0.831",
     "0.59 / 0.56",
     "0.30 / 0.24",
     "—",
     "—",
     "3/16",
     "3/16"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "1-1/8",
     "1-11/16",
     "1.688 / 1.631",
     "1.949 / 1.859",
     "31/32",
     "0.999 / 0.939",
     "0.64 / 0.61",
     "0.33 / 0.24",
     "—",
     "—",
     "—",
     "—"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "1-1/4",
     "1-7/8",
     "1.875 / 1.812",
     "2.165 / 2.066",
     "1-1/16",
     "1.094 / 1.030",
     "0.70 / 0.67",
     "0.40 / 0.31",
     "—",
     "—",
     "5/16",
     "9/32"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "1-3/8",
     "2-1/16",
     "2.062 / 1.994",
     "2.382 / 2.273",
     "1-11/64",
     "1.206 / 1.138",
     "0.82 / 0.78",
     "0.40 / 0.31",
     "—",
     "—",
     "—",
     "—"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "1-1/2",
     "2-1/4",
     "2.250 / 2.175",
     "2.598 / 2.480",
     "1-9/32",
     "1.317 / 1.245",
     "0.86 / 0.82",
     "0.46 / 0.37",
     "—",
     "—",
     "—",
     "5/16"
    ],
    [
     "hex slotted nut (ASME B18.2.2)",
     "2",
     "3",
     "3.000 / 2.900",
     "3.464 / 3.306",
     "1-23/32",
     "1.759 / 1.679",
     "1.24 / 1.20",
     "0.52 / 0.43",
     "—",
     "—",
     "—",
     "3/8"
    ],
    [
     "hex castle nut (ANSI B18.2.2-1970)",
     "1/4",
     "7/16",
     "0.438 / 0.428",
     "0.505 / 0.488",
     "9/32",
     "0.288 / 0.274",
     "3/16 (max 0.20 / min 0.18)",
     "0.10 / 0.07",
     "0.371",
     "0.094",
     "1/16",
     "1/16"
    ],
    [
     "hex castle nut (ANSI B18.2.2-1970)",
     "5/16",
     "1/2",
     "0.500 / 0.489",
     "0.577 / 0.557",
     "21/64",
     "0.336 / 0.320",
     "15/64 (max 0.24 / min 0.22)",
     "0.12 / 0.09",
     "0.425",
     "0.094",
     "5/64",
     "5/64"
    ],
    [
     "hex castle nut (ANSI B18.2.2-1970)",
     "3/8",
     "9/16",
     "0.562 / 0.551",
     "0.650 / 0.628",
     "13/32",
     "0.415 / 0.398",
     "9/32 (max 0.29 / min 0.27)",
     "0.15 / 0.12",
     "0.478",
     "0.094",
     "7/64",
     "7/64"
    ],
    [
     "hex castle nut (ANSI B18.2.2-1970)",
     "7/16",
     "11/16",
     "0.688 / 0.675",
     "0.794 / 0.768",
     "29/64",
     "0.463 / 0.444",
     "19/64 (max 0.31 / min 0.29)",
     "0.15 / 0.12",
     "0.582",
     "0.094",
     "7/64",
     "3/32"
    ],
    [
     "hex castle nut (ANSI B18.2.2-1970)",
     "1/2",
     "3/4",
     "0.750 / 0.736",
     "0.866 / 0.840",
     "9/16",
     "0.573 / 0.552",
     "13/32 (max 0.42 / min 0.40)",
     "0.18 / 0.15",
     "0.637",
     "0.125",
     "7/64",
     "1/8"
    ],
    [
     "hex castle nut (ANSI B18.2.2-1970)",
     "9/16",
     "7/8",
     "0.875 / 0.861",
     "1.010 / 0.982",
     "39/64",
     "0.621 / 0.598",
     "27/64 (max 0.43 / min 0.41)",
     "0.18 / 0.15",
     "0.744",
     "0.156",
     "9/64",
     "7/64"
    ],
    [
     "hex castle nut (ANSI B18.2.2-1970)",
     "5/8",
     "15/16",
     "0.938 / 0.922",
     "1.083 / 1.051",
     "23/32",
     "0.731 / 0.706",
     "1/2 (max 0.51 / min 0.49)",
     "0.24 / 0.18",
     "0.797",
     "0.156",
     "5/32",
     "5/32"
    ],
    [
     "hex castle nut (ANSI B18.2.2-1970)",
     "3/4",
     "1-1/8",
     "1.125 / 1.088",
     "1.299 / 1.240",
     "13/16",
     "0.827 / 0.798",
     "9/16 (max 0.57 / min 0.55)",
     "0.24 / 0.18",
     "0.941",
     "0.188",
     "5/32",
     "5/32"
    ],
    [
     "hex castle nut (ANSI B18.2.2-1970)",
     "7/8",
     "1-5/16",
     "1.312 / 1.269",
     "1.516 / 1.447",
     "29/32",
     "0.922 / 0.890",
     "21/32 (max 0.67 / min 0.64)",
     "0.24 / 0.18",
     "1.097",
     "0.188",
     "3/16",
     "5/32"
    ],
    [
     "hex castle nut (ANSI B18.2.2-1970)",
     "1",
     "1-1/2",
     "1.500 / 1.450",
     "1.732 / 1.653",
     "1",
     "1.018 / 0.982",
     "23/32 (max 0.73 / min 0.70)",
     "0.30 / 0.24",
     "1.254",
     "0.188",
     "3/16",
     "3/16"
    ],
    [
     "hex castle nut (ANSI B18.2.2-1970)",
     "1-1/4",
     "1-7/8",
     "1.875 / 1.812",
     "2.165 / 2.066",
     "1-1/4",
     "1.272 / 1.228",
     "7/8 (max 0.89 / min 0.86)",
     "0.40 / 0.31",
     "1.570",
     "0.250",
     "5/16",
     "9/32"
    ]
   ]
  }
 },
 "sheet_text": "Slotted and castle nuts, inch (ASME B18.2.2): hex slotted 1/4 to 2 in, castle 1/4 to 1-1/4 in — across flats, height, slot width, cotter hole + envelope models — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/slotted-castle-nuts-inch-asme-b18-2-2/  (sheet CC BY 4.0)\nBasis: AFT Fasteners' ASME B18.2.2 hex slotted nut and castle nut tables (Engineers Edge and a Shopify-hosted castle sheet as cross-checks), McMaster-Carr's slotted-nut table for the cotter pin hole; eight envelope models as files\nCatalog version: 2026-10-20\n\nOverall (mm): length 12.8, width 11.1, height 5.6\n- Hex slotted nuts (AFT, citing ANSI / ASME B18.2.2), inches, 1/4 to 2: width across flats F (basic, then max / min), width across corners G max / min, thickness H (basic, then max / min), unslotted thickness T (max / min), slot width S (max / min). AFT's flattened table was read by header order, so check the standard if a figure matters. Engineers Edge prints the same F, H (as a decimal), T and S for the sizes it lists (1/4 and 3/4 to 1-1/2 read). Threads UNC, UNF or 8UN; steel nuts to ASTM A563 grade A or SAE J995 grade 2 unless specified (Engineers Edge).\n- Hex castle nuts (AFT, ANSI B18.2.2-1970 column, 1/4 to 1-1/4): the slots are cut in a cylinder whose diameter W (minimum) is a little under the hex width, with a fillet R at its base. T is the height of the hex part (basic, then max / min). The AFT page labels its last castle row '1-1/4' but prints a major diameter of 1.1250 beside it; the row's F of 1-7/8 matches the 1-1/4 slotted nut, so it is shown as 1-1/4. The castle slot widths equal the slotted-nut S for the same size. A Shopify-hosted castle sheet prints the same numbers with other column labels. AFT says the castle values for Grade 5 nuts are recommendations, not an industry norm.\n- Cotter pin hole diameter per McMaster-Carr (inches): Grade 5 slotted nuts and, separately, low-strength steel slotted nuts differ from 7/16 up (for example 1/2: 7/64 and 1/8; 7/8: 3/16 and 5/32; 1-1/4: 5/16 and 9/32). Both are shown; use the pin hole of the nut you buy. McMaster's Grade 5 heights differ from AFT's basic H in two places: 7/8 (McMaster 49/64, AFT basic 3/4; McMaster's low-strength nut is 3/4) and 1-1/4 (McMaster 1-3/32 = 1.094, AFT basic 1-1/16, AFT max 1.094); AFT's max / min brackets both values.\n- Files are Xem-drawn envelopes: hex at the basic width across flats and basic height, six slots (three straight cuts 60° apart) of the maximum published slot width S to the unslotted thickness (slotted nuts: T max, castle nuts: T basic); the castle collar is a plain cylinder at W min. The bore is a plain cylinder at the nominal thread major diameter; no chamfer, no washer face, no fillet R. Sizes drawn: slotted 1/4, 3/8, 1/2, 5/8, 3/4; castle 1/4, 1/2, 3/4.\n- McMaster-Carr sells slotted hex nuts and castellated nuts with per-part STEP; the categories are linked, not copied. Metric: slotted-castle-nuts-din-935.\n\ntype  size (in)  F basic  F max / min  G max / min  H basic  H max / min  T (unslotted thickness)  S slot width max / min  W min (castle collar dia)  R (castle fillet)  cotter pin hole, Grade 5 (McMaster, in)  cotter pin hole, low-strength (McMaster, in)\nhex slotted nut (ASME B18.2.2)  1/4  7/16  0.438 / 0.428  0.505 / 0.488  7/32  0.226 / 0.212  0.14 / 0.12  0.10 / 0.07  —  —  1/16  1/16\nhex slotted nut (ASME B18.2.2)  5/16  1/2  0.500 / 0.489  0.577 / 0.557  17/64  0.273 / 0.258  0.18 / 0.16  0.12 / 0.09  —  —  5/64  5/64\nhex slotted nut (ASME B18.2.2)  3/8  9/16  0.562 / 0.551  0.650 / 0.628  21/64  0.337 / 0.320  0.21 / 0.19  0.15 / 0.12  —  —  7/64  7/64\nhex slotted nut (ASME B18.2.2)  7/16  11/16  0.688 / 0.675  0.794 / 0.768  3/8  0.385 / 0.365  0.23 / 0.21  0.15 / 0.12  —  —  7/64  3/32\nhex slotted nut (ASME B18.2.2)  1/2  3/4  0.750 / 0.736  0.866 / 0.840  7/16  0.448 / 0.427  0.29 / 0.27  0.18 / 0.15  —  —  7/64  1/8\nhex slotted nut (ASME B18.2.2)  9/16  7/8  0.875 / 0.861  1.010 / 0.982  31/64  0.496 / 0.473  0.31 / 0.29  0.18 / 0.15  —  —  9/64  7/64\nhex slotted nut (ASME B18.2.2)  5/8  15/16  0.938 / 0.922  1.083 / 1.051  35/64  0.559 / 0.535  0.34 / 0.32  0.24 / 0.18  —  —  5/32  5/32\nhex slotted nut (ASME B18.2.2)  3/4  1-1/8  1.125 / 1.088  1.299 / 1.240  41/64  0.665 / 0.617  0.40 / 0.38  0.24 / 0.18  —  —  5/32  5/32\nhex slotted nut (ASME B18.2.2)  7/8  1-5/16  1.312 / 1.269  1.516 / 1.447  3/4  0.776 / 0.724  0.52 / 0.49  0.24 / 0.18  —  —  3/16  5/32\nhex slotted nut (ASME B18.2.2)  1  1-1/2  1.500 / 1.450  1.732 / 1.653  55/64  0.887 / 0.831  0.59 / 0.56  0.30 / 0.24  —  —  3/16  3/16\nhex slotted nut (ASME B18.2.2)  1-1/8  1-11/16  1.688 / 1.631  1.949 / 1.859  31/32  0.999 / 0.939  0.64 / 0.61  0.33 / 0.24  —  —  —  —\nhex slotted nut (ASME B18.2.2)  1-1/4  1-7/8  1.875 / 1.812  2.165 / 2.066  1-1/16  1.094 / 1.030  0.70 / 0.67  0.40 / 0.31  —  —  5/16  9/32\nhex slotted nut (ASME B18.2.2)  1-3/8  2-1/16  2.062 / 1.994  2.382 / 2.273  1-11/64  1.206 / 1.138  0.82 / 0.78  0.40 / 0.31  —  —  —  —\nhex slotted nut (ASME B18.2.2)  1-1/2  2-1/4  2.250 / 2.175  2.598 / 2.480  1-9/32  1.317 / 1.245  0.86 / 0.82  0.46 / 0.37  —  —  —  5/16\nhex slotted nut (ASME B18.2.2)  2  3  3.000 / 2.900  3.464 / 3.306  1-23/32  1.759 / 1.679  1.24 / 1.20  0.52 / 0.43  —  —  —  3/8\nhex castle nut (ANSI B18.2.2-1970)  1/4  7/16  0.438 / 0.428  0.505 / 0.488  9/32  0.288 / 0.274  3/16 (max 0.20 / min 0.18)  0.10 / 0.07  0.371  0.094  1/16  1/16\nhex castle nut (ANSI B18.2.2-1970)  5/16  1/2  0.500 / 0.489  0.577 / 0.557  21/64  0.336 / 0.320  15/64 (max 0.24 / min 0.22)  0.12 / 0.09  0.425  0.094  5/64  5/64\nhex castle nut (ANSI B18.2.2-1970)  3/8  9/16  0.562 / 0.551  0.650 / 0.628  13/32  0.415 / 0.398  9/32 (max 0.29 / min 0.27)  0.15 / 0.12  0.478  0.094  7/64  7/64\nhex castle nut (ANSI B18.2.2-1970)  7/16  11/16  0.688 / 0.675  0.794 / 0.768  29/64  0.463 / 0.444  19/64 (max 0.31 / min 0.29)  0.15 / 0.12  0.582  0.094  7/64  3/32\nhex castle nut (ANSI B18.2.2-1970)  1/2  3/4  0.750 / 0.736  0.866 / 0.840  9/16  0.573 / 0.552  13/32 (max 0.42 / min 0.40)  0.18 / 0.15  0.637  0.125  7/64  1/8\nhex castle nut (ANSI B18.2.2-1970)  9/16  7/8  0.875 / 0.861  1.010 / 0.982  39/64  0.621 / 0.598  27/64 (max 0.43 / min 0.41)  0.18 / 0.15  0.744  0.156  9/64  7/64\nhex castle nut (ANSI B18.2.2-1970)  5/8  15/16  0.938 / 0.922  1.083 / 1.051  23/32  0.731 / 0.706  1/2 (max 0.51 / min 0.49)  0.24 / 0.18  0.797  0.156  5/32  5/32\nhex castle nut (ANSI B18.2.2-1970)  3/4  1-1/8  1.125 / 1.088  1.299 / 1.240  13/16  0.827 / 0.798  9/16 (max 0.57 / min 0.55)  0.24 / 0.18  0.941  0.188  5/32  5/32\nhex castle nut (ANSI B18.2.2-1970)  7/8  1-5/16  1.312 / 1.269  1.516 / 1.447  29/32  0.922 / 0.890  21/32 (max 0.67 / min 0.64)  0.24 / 0.18  1.097  0.188  3/16  5/32\nhex castle nut (ANSI B18.2.2-1970)  1  1-1/2  1.500 / 1.450  1.732 / 1.653  1  1.018 / 0.982  23/32 (max 0.73 / min 0.70)  0.30 / 0.24  1.254  0.188  3/16  3/16\nhex castle nut (ANSI B18.2.2-1970)  1-1/4  1-7/8  1.875 / 1.812  2.165 / 2.066  1-1/4  1.272 / 1.228  7/8 (max 0.89 / min 0.86)  0.40 / 0.31  1.570  0.250  5/16  9/32\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- AFT Fasteners: Hex slotted nuts, ANSI / ASME B18.2.2: F, G, H, T, S, FIM max / min per size 1/4 to 2 — web — Maker / distributor reference; numbers only. The page table is flattened; columns follow its header order — https://www.aftfasteners.com/hex-slotted-nuts-technical-information/\n- Engineers Edge: Slotted hex nut dimensions (ASME B18.2.2): basic thread dia, F flat width, H thickness, T unslotted thickness, S slot width (1/4, 3/4 to 1-1/2 read) — web — Reference page; numbers only — https://ns2.engineersedge.com/slotted_hex_nut.htm\n- AFT Fasteners: Hex castle nuts, ANSI B18.2.2 (1970): F, G, H, T, S, R, W min, FIR per size 1/4 to 1-1/4 — web — Maker / distributor reference; numbers only — https://aftfasteners.com/hex-castle-nuts-technical-information\n- Castle nut sheet (hosted on a Shopify CDN, maker not named in the text read): Castle nuts, ANSI B18.2.2 (1970): same values as the AFT table with other column labels — web — Maker datasheet; numbers only — https://cdn2.shopify.com/s/files/1/0056/7856/3437/files/Nutscastle.pdf\n- McMaster-Carr: Slotted hex nuts (inch and metric, cotter pin diameter per size) (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/slotted-hex-nuts\n- McMaster-Carr: Castellated nuts (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/castellated-nuts\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 8 parts): https://xemstudio.com/files/hardware/slotted-castle-nuts-inch-asme-b18-2-2/index.json\nAPI: https://xemstudio.com/api/geometry?object=slotted-castle-nuts-inch-asme-b18-2-2\n",
 "sources": [
  {
   "publisher": "AFT Fasteners",
   "title": "Hex slotted nuts, ANSI / ASME B18.2.2: F, G, H, T, S, FIM max / min per size 1/4 to 2",
   "url": "https://www.aftfasteners.com/hex-slotted-nuts-technical-information/",
   "formats": [
    "web"
   ],
   "license": "Maker / distributor reference; numbers only. The page table is flattened; columns follow its header order",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Engineers Edge",
   "title": "Slotted hex nut dimensions (ASME B18.2.2): basic thread dia, F flat width, H thickness, T unslotted thickness, S slot width (1/4, 3/4 to 1-1/2 read)",
   "url": "https://ns2.engineersedge.com/slotted_hex_nut.htm",
   "formats": [
    "web"
   ],
   "license": "Reference page; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "AFT Fasteners",
   "title": "Hex castle nuts, ANSI B18.2.2 (1970): F, G, H, T, S, R, W min, FIR per size 1/4 to 1-1/4",
   "url": "https://aftfasteners.com/hex-castle-nuts-technical-information",
   "formats": [
    "web"
   ],
   "license": "Maker / distributor reference; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Castle nut sheet (hosted on a Shopify CDN, maker not named in the text read)",
   "title": "Castle nuts, ANSI B18.2.2 (1970): same values as the AFT table with other column labels",
   "url": "https://cdn2.shopify.com/s/files/1/0056/7856/3437/files/Nutscastle.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker datasheet; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Slotted hex nuts (inch and metric, cotter pin diameter per size) (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/slotted-hex-nuts",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Castellated nuts (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/castellated-nuts",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "slotted-castle-nuts-din-935",
  "hex-nuts-inch",
  "hex-nuts-inch-7-8-to-1-1-2-jam-heavy",
  "nylon-insert-lock-nuts-inch-asme-b18-16-6",
  "coupling-nuts-din-6334-and-inch",
  "prevailing-torque-all-metal-nuts",
  "r-clips-hairpin-cotters-din-11024",
  "clevis-pins"
 ],
 "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": "1/4 to 3/4 in: Ø6.35, 9.525, 12.7, 15.875, 19.05 mm (thread major)",
   "mates": "bolt of the same thread (plain cylinder at the major Ø)",
   "fit": "designed",
   "files": "hex-"
  },
  {
   "feature": "six slots",
   "exact": "S max: 1/4 0.10, 3/8 0.15, 1/2 0.18, 5/8 0.24, 3/4 0.24 in",
   "mates": "cotter pin hole (McMaster, Grade 5 slotted nut): 1/4 1/16, 3/8 7/64, 1/2 7/64, 5/8 5/32, 3/4 5/32 in",
   "fit": "slide",
   "files": "hex-"
  },
  {
   "feature": "hex body",
   "exact": "F basic: 1/4 7/16, 3/8 9/16, 1/2 3/4, 5/8 15/16, 3/4 1-1/8 in",
   "mates": "hex pocket or wrench: width = F",
   "fit": "slide",
   "files": "hex-"
  }
 ],
 "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 cotter pin for a 1/2 inch castle nut?",
   "a": "McMaster-Carr lists a 7/64 in cotter pin hole for Grade 5 1/2-13 and 1/2-20 slotted nuts and 1/8 in for low-strength steel ones; the hex is 3/4 in across flats and 7/16 in high (slotted) per AFT's B18.2.2 table."
  },
  {
   "q": "How wide is the slot on a 3/8 inch slotted nut?",
   "a": "0.15 in max and 0.12 in min (S), with an unslotted thickness T of 0.21 / 0.19 in on a 21/64 in thick nut."
  },
  {
   "q": "What is the difference between a slotted nut and a castle nut?",
   "a": "A slotted nut has its slots cut in a plain hex; a castle nut has a round collar on top of the hex and the slots are cut through the collar (diameter W, 0.371 in min for 1/4)."
  }
 ],
 "files_license": null,
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   "stl": "https://xemstudio.com/files/hardware/slotted-castle-nuts-inch-asme-b18-2-2/hex-slotted-nut-1-4-envelope.stl",
   "note": "1/4 hex slotted nut envelope: hex 7/16 in across flats (basic) × 7/32 in high (H basic), six slots 0.10 in wide (S max) to the unslotted thickness T max 0.14 in (slot depth 2.00 mm), bore Ø6.35 mm (1/4 in thread major diameter as a plain cylinder); no chamfers, thread or washer face"
  },
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   "stl": "https://xemstudio.com/files/hardware/slotted-castle-nuts-inch-asme-b18-2-2/hex-slotted-nut-3-8-envelope.stl",
   "note": "3/8 hex slotted nut envelope: hex 9/16 in across flats (basic) × 21/64 in high (H basic), six slots 0.15 in wide (S max) to the unslotted thickness T max 0.21 in (slot depth 3.00 mm), bore Ø9.52 mm (3/8 in thread major diameter as a plain cylinder); no chamfers, thread or washer face"
  },
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   "stl": "https://xemstudio.com/files/hardware/slotted-castle-nuts-inch-asme-b18-2-2/hex-slotted-nut-1-2-envelope.stl",
   "note": "1/2 hex slotted nut envelope: hex 3/4 in across flats (basic) × 7/16 in high (H basic), six slots 0.18 in wide (S max) to the unslotted thickness T max 0.29 in (slot depth 3.75 mm), bore Ø12.70 mm (1/2 in thread major diameter as a plain cylinder); no chamfers, thread or washer face"
  },
  {
   "file": "hex-slotted-nut-5-8-envelope",
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   "stl": "https://xemstudio.com/files/hardware/slotted-castle-nuts-inch-asme-b18-2-2/hex-slotted-nut-5-8-envelope.stl",
   "note": "5/8 hex slotted nut envelope: hex 15/16 in across flats (basic) × 35/64 in high (H basic), six slots 0.24 in wide (S max) to the unslotted thickness T max 0.34 in (slot depth 5.25 mm), bore Ø15.88 mm (5/8 in thread major diameter as a plain cylinder); no chamfers, thread or washer face"
  },
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   "stl": "https://xemstudio.com/files/hardware/slotted-castle-nuts-inch-asme-b18-2-2/hex-slotted-nut-3-4-envelope.stl",
   "note": "3/4 hex slotted nut envelope: hex 1-1/8 in across flats (basic) × 41/64 in high (H basic), six slots 0.24 in wide (S max) to the unslotted thickness T max 0.40 in (slot depth 6.11 mm), bore Ø19.05 mm (3/4 in thread major diameter as a plain cylinder); no chamfers, thread or washer face"
  },
  {
   "file": "hex-castle-nut-1-4-envelope",
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   "stl": "https://xemstudio.com/files/hardware/slotted-castle-nuts-inch-asme-b18-2-2/hex-castle-nut-1-4-envelope.stl",
   "note": "1/4 hex castle nut envelope: hex 7/16 in across flats (basic) × 3/16 in (T basic), round collar Ø0.371 in (W min) up to 9/32 in overall height (H basic), six slots 0.10 in wide (S max) through the collar, bore Ø6.35 mm (1/4 in thread major diameter as a plain cylinder); no chamfers, fillet R or thread"
  },
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   "file": "hex-castle-nut-1-2-envelope",
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   "stl": "https://xemstudio.com/files/hardware/slotted-castle-nuts-inch-asme-b18-2-2/hex-castle-nut-1-2-envelope.stl",
   "note": "1/2 hex castle nut envelope: hex 3/4 in across flats (basic) × 13/32 in (T basic), round collar Ø0.637 in (W min) up to 9/16 in overall height (H basic), six slots 0.18 in wide (S max) through the collar, bore Ø12.70 mm (1/2 in thread major diameter as a plain cylinder); no chamfers, fillet R or thread"
  },
  {
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   "stl": "https://xemstudio.com/files/hardware/slotted-castle-nuts-inch-asme-b18-2-2/hex-castle-nut-3-4-envelope.stl",
   "note": "3/4 hex castle nut envelope: hex 1-1/8 in across flats (basic) × 9/16 in (T basic), round collar Ø0.941 in (W min) up to 13/16 in overall height (H basic), six slots 0.24 in wide (S max) through the collar, bore Ø19.05 mm (3/4 in thread major diameter as a plain cylinder); no chamfers, fillet R or thread"
  }
 ],
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}