{
 "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": "plain-washers-inch-type-b",
 "name": "Plain washers, inch Type B (narrow, regular, wide): #0 to 3 in ID, OD, thickness + 12 washer files",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What are the dimensions of a Type B narrow, regular or wide flat washer, and what is the OD of a 3/8 wide washer?",
 "tags": [
  "flat washer",
  "type b washer",
  "narrow washer",
  "wide washer",
  "regular washer",
  "sae washer",
  "uss washer",
  "fender washer",
  "fastener"
 ],
 "aliases": [
  "type b flat washer dimensions",
  "1/4 wide washer outside diameter",
  "3/8 narrow flat washer",
  "1/2 regular washer dimensions",
  "flat washer size chart inch",
  "#10 washer outside diameter",
  "5/16 flat washer id od",
  "type b washer 3/4 wide",
  "narrow regular wide washer series",
  "washer dimensions inch stl"
 ],
 "overall_mm": {
  "length": 63.5,
  "width": 63.5,
  "height": 4.1
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 12,
 "url": "https://xemstudio.com/objects/plain-washers-inch-type-b/",
 "sheet_txt": "https://xemstudio.com/objects/plain-washers-inch-type-b/sheet.txt",
 "sheet": {
  "basis": "Tubing China's ANSI Type B flat washer table (#0 to 3 in), checked against Portland Bolt's Type B table (1/4 to 3 in, same ID, OD and thickness on every row read) and Fastener SuperStore's narrow-series limits; twelve washer files",
  "overall_mm": {
   "length": 63.5,
   "width": 63.5,
   "height": 4.1
  },
  "notes": [
   "Type B plain washers come in three series for each screw size: narrow (N), regular (R) and wide (W), with a bore that is the same across the three. Dimensions are basic inches with computed mm columns. Basic ID, OD and thickness are the same in Tubing China's and Portland Bolt's tables for every size from 1/4 to 3 in. Fastener SuperStore's narrow-series table (labelled ASME B18.21.1-2009) prints limits that fit the same basics: 1/4 in ID 0.296 / 0.276 around 0.281, OD 0.515 / 0.495 around 0.500, thickness 0.071 / 0.056 around 0.063 (and the same pattern at 3/8, 1/2 in). Standard naming varies by source: Portland Bolt's page is titled 'Type B plain washers', Fastener SuperStore cites ASME B18.21.1-2009, and Engineers Edge's Type A table is credited to ANSI/ASME B18.22.1. Check the edition you buy to.",
   "Portland Bolt prints some obvious slips (a tolerance of 0.303 and a 1-in narrow maximum thickness of 0.122); basic values are used, not tolerances. The Portland Bolt table has the thickness header shifted by one column; its 'basic' thickness (0.063 for 1/4 narrow) is the one used. Portland Bolt's 7/8 and 1 in series rows and the extra half sizes were not all compared.",
   "Type A (SAE narrow / USS wide) washers, 1/4 to 3/4 in, are on flat-washers-inch. Type B is the series with a bore that is about 0.031 in over the screw for the same series, so the 1/4 in Type B wide washer (ID 0.281, OD 1.000) is not the 1/4 in USS Type A washer (ID 0.312, OD 0.734).",
   "Files are Xem-drawn flat annuli at the basic sizes for 1/4, 3/8, 1/2 and 3/4 in in all three series; thickness is the basic value. McMaster-Carr sells these washers with per-part STEP; no category URL could be verified, so none is linked."
  ],
  "table": {
   "columns": [
    "screw size",
    "decimal size (in)",
    "series",
    "ID (in)",
    "OD (in)",
    "thickness (in)",
    "ID (mm)",
    "OD (mm)",
    "thickness (mm)"
   ],
   "rows": [
    [
     "#0",
     "0.06",
     "narrow",
     "0.068",
     "0.125",
     "0.025",
     "1.73",
     "3.17",
     "0.64"
    ],
    [
     "#0",
     "0.06",
     "regular",
     "0.068",
     "0.188",
     "0.025",
     "1.73",
     "4.78",
     "0.64"
    ],
    [
     "#0",
     "0.06",
     "wide",
     "0.068",
     "0.250",
     "0.025",
     "1.73",
     "6.35",
     "0.64"
    ],
    [
     "#1",
     "0.073",
     "narrow",
     "0.084",
     "0.156",
     "0.025",
     "2.13",
     "3.96",
     "0.64"
    ],
    [
     "#1",
     "0.073",
     "regular",
     "0.084",
     "0.219",
     "0.025",
     "2.13",
     "5.56",
     "0.64"
    ],
    [
     "#1",
     "0.073",
     "wide",
     "0.084",
     "0.281",
     "0.032",
     "2.13",
     "7.14",
     "0.81"
    ],
    [
     "#2",
     "0.086",
     "narrow",
     "0.094",
     "0.188",
     "0.025",
     "2.39",
     "4.78",
     "0.64"
    ],
    [
     "#2",
     "0.086",
     "regular",
     "0.094",
     "0.250",
     "0.032",
     "2.39",
     "6.35",
     "0.81"
    ],
    [
     "#2",
     "0.086",
     "wide",
     "0.094",
     "0.344",
     "0.032",
     "2.39",
     "8.74",
     "0.81"
    ],
    [
     "#3",
     "0.099",
     "narrow",
     "0.109",
     "0.219",
     "0.025",
     "2.77",
     "5.56",
     "0.64"
    ],
    [
     "#3",
     "0.099",
     "regular",
     "0.109",
     "0.312",
     "0.032",
     "2.77",
     "7.92",
     "0.81"
    ],
    [
     "#3",
     "0.099",
     "wide",
     "0.109",
     "0.406",
     "0.040",
     "2.77",
     "10.31",
     "1.02"
    ],
    [
     "#4",
     "0.112",
     "narrow",
     "0.125",
     "0.250",
     "0.032",
     "3.17",
     "6.35",
     "0.81"
    ],
    [
     "#4",
     "0.112",
     "regular",
     "0.125",
     "0.375",
     "0.040",
     "3.17",
     "9.52",
     "1.02"
    ],
    [
     "#4",
     "0.112",
     "wide",
     "0.125",
     "0.438",
     "0.040",
     "3.17",
     "11.13",
     "1.02"
    ],
    [
     "#5",
     "0.125",
     "narrow",
     "0.141",
     "0.281",
     "0.032",
     "3.58",
     "7.14",
     "0.81"
    ],
    [
     "#5",
     "0.125",
     "regular",
     "0.141",
     "0.406",
     "0.040",
     "3.58",
     "10.31",
     "1.02"
    ],
    [
     "#5",
     "0.125",
     "wide",
     "0.141",
     "0.500",
     "0.040",
     "3.58",
     "12.70",
     "1.02"
    ],
    [
     "#6",
     "0.138",
     "narrow",
     "0.156",
     "0.312",
     "0.032",
     "3.96",
     "7.92",
     "0.81"
    ],
    [
     "#6",
     "0.138",
     "regular",
     "0.156",
     "0.438",
     "0.040",
     "3.96",
     "11.13",
     "1.02"
    ],
    [
     "#6",
     "0.138",
     "wide",
     "0.156",
     "0.562",
     "0.040",
     "3.96",
     "14.27",
     "1.02"
    ],
    [
     "#8",
     "0.164",
     "narrow",
     "0.188",
     "0.375",
     "0.040",
     "4.78",
     "9.52",
     "1.02"
    ],
    [
     "#8",
     "0.164",
     "regular",
     "0.188",
     "0.500",
     "0.040",
     "4.78",
     "12.70",
     "1.02"
    ],
    [
     "#8",
     "0.164",
     "wide",
     "0.188",
     "0.625",
     "0.063",
     "4.78",
     "15.88",
     "1.60"
    ],
    [
     "#10",
     "0.19",
     "narrow",
     "0.203",
     "0.406",
     "0.040",
     "5.16",
     "10.31",
     "1.02"
    ],
    [
     "#10",
     "0.19",
     "regular",
     "0.203",
     "0.562",
     "0.040",
     "5.16",
     "14.27",
     "1.02"
    ],
    [
     "#10",
     "0.19",
     "wide",
     "0.203",
     "0.734",
     "0.063",
     "5.16",
     "18.64",
     "1.60"
    ],
    [
     "#12",
     "0.216",
     "narrow",
     "0.234",
     "0.438",
     "0.040",
     "5.94",
     "11.13",
     "1.02"
    ],
    [
     "#12",
     "0.216",
     "regular",
     "0.234",
     "0.625",
     "0.063",
     "5.94",
     "15.88",
     "1.60"
    ],
    [
     "#12",
     "0.216",
     "wide",
     "0.234",
     "0.875",
     "0.063",
     "5.94",
     "22.22",
     "1.60"
    ],
    [
     "1/4",
     "0.25",
     "narrow",
     "0.281",
     "0.500",
     "0.063",
     "7.14",
     "12.70",
     "1.60"
    ],
    [
     "1/4",
     "0.25",
     "regular",
     "0.281",
     "0.734",
     "0.063",
     "7.14",
     "18.64",
     "1.60"
    ],
    [
     "1/4",
     "0.25",
     "wide",
     "0.281",
     "1.000",
     "0.063",
     "7.14",
     "25.40",
     "1.60"
    ],
    [
     "5/16",
     "0.3125",
     "narrow",
     "0.344",
     "0.625",
     "0.063",
     "8.74",
     "15.88",
     "1.60"
    ],
    [
     "5/16",
     "0.3125",
     "regular",
     "0.344",
     "0.875",
     "0.063",
     "8.74",
     "22.22",
     "1.60"
    ],
    [
     "5/16",
     "0.3125",
     "wide",
     "0.344",
     "1.125",
     "0.063",
     "8.74",
     "28.57",
     "1.60"
    ],
    [
     "3/8",
     "0.375",
     "narrow",
     "0.406",
     "0.734",
     "0.063",
     "10.31",
     "18.64",
     "1.60"
    ],
    [
     "3/8",
     "0.375",
     "regular",
     "0.406",
     "1.000",
     "0.063",
     "10.31",
     "25.40",
     "1.60"
    ],
    [
     "3/8",
     "0.375",
     "wide",
     "0.406",
     "1.250",
     "0.100",
     "10.31",
     "31.75",
     "2.54"
    ],
    [
     "7/16",
     "0.4375",
     "narrow",
     "0.469",
     "0.875",
     "0.063",
     "11.91",
     "22.22",
     "1.60"
    ],
    [
     "7/16",
     "0.4375",
     "regular",
     "0.469",
     "1.125",
     "0.063",
     "11.91",
     "28.57",
     "1.60"
    ],
    [
     "7/16",
     "0.4375",
     "wide",
     "0.469",
     "1.469",
     "0.100",
     "11.91",
     "37.31",
     "2.54"
    ],
    [
     "1/2",
     "0.5",
     "narrow",
     "0.531",
     "1.000",
     "0.063",
     "13.49",
     "25.40",
     "1.60"
    ],
    [
     "1/2",
     "0.5",
     "regular",
     "0.531",
     "1.250",
     "0.100",
     "13.49",
     "31.75",
     "2.54"
    ],
    [
     "1/2",
     "0.5",
     "wide",
     "0.531",
     "1.750",
     "0.100",
     "13.49",
     "44.45",
     "2.54"
    ],
    [
     "9/16",
     "0.5625",
     "narrow",
     "0.594",
     "1.125",
     "0.063",
     "15.09",
     "28.57",
     "1.60"
    ],
    [
     "9/16",
     "0.5625",
     "regular",
     "0.594",
     "1.469",
     "0.100",
     "15.09",
     "37.31",
     "2.54"
    ],
    [
     "9/16",
     "0.5625",
     "wide",
     "0.594",
     "2.000",
     "0.100",
     "15.09",
     "50.80",
     "2.54"
    ],
    [
     "5/8",
     "0.625",
     "narrow",
     "0.656",
     "1.250",
     "0.100",
     "16.66",
     "31.75",
     "2.54"
    ],
    [
     "5/8",
     "0.625",
     "regular",
     "0.656",
     "1.750",
     "0.100",
     "16.66",
     "44.45",
     "2.54"
    ],
    [
     "5/8",
     "0.625",
     "wide",
     "0.656",
     "2.250",
     "0.160",
     "16.66",
     "57.15",
     "4.06"
    ],
    [
     "3/4",
     "0.75",
     "narrow",
     "0.812",
     "1.375",
     "0.100",
     "20.62",
     "34.92",
     "2.54"
    ],
    [
     "3/4",
     "0.75",
     "regular",
     "0.812",
     "2.000",
     "0.100",
     "20.62",
     "50.80",
     "2.54"
    ],
    [
     "3/4",
     "0.75",
     "wide",
     "0.812",
     "2.500",
     "0.160",
     "20.62",
     "63.50",
     "4.06"
    ],
    [
     "7/8",
     "0.875",
     "narrow",
     "0.938",
     "1.469",
     "0.100",
     "23.83",
     "37.31",
     "2.54"
    ],
    [
     "7/8",
     "0.875",
     "regular",
     "0.938",
     "2.250",
     "0.160",
     "23.83",
     "57.15",
     "4.06"
    ],
    [
     "7/8",
     "0.875",
     "wide",
     "0.938",
     "2.750",
     "0.160",
     "23.83",
     "69.85",
     "4.06"
    ],
    [
     "1",
     "1",
     "narrow",
     "1.062",
     "1.750",
     "0.100",
     "26.97",
     "44.45",
     "2.54"
    ],
    [
     "1",
     "1",
     "regular",
     "1.062",
     "2.500",
     "0.160",
     "26.97",
     "63.50",
     "4.06"
    ],
    [
     "1",
     "1",
     "wide",
     "1.062",
     "3.000",
     "0.160",
     "26.97",
     "76.20",
     "4.06"
    ],
    [
     "1-1/8",
     "1.125",
     "narrow",
     "1.188",
     "2.000",
     "0.100",
     "30.18",
     "50.80",
     "2.54"
    ],
    [
     "1-1/8",
     "1.125",
     "regular",
     "1.188",
     "2.750",
     "0.160",
     "30.18",
     "69.85",
     "4.06"
    ],
    [
     "1-1/8",
     "1.125",
     "wide",
     "1.188",
     "3.250",
     "0.160",
     "30.18",
     "82.55",
     "4.06"
    ],
    [
     "1-1/4",
     "1.25",
     "narrow",
     "1.312",
     "2.250",
     "0.160",
     "33.32",
     "57.15",
     "4.06"
    ],
    [
     "1-1/4",
     "1.25",
     "regular",
     "1.312",
     "3.000",
     "0.160",
     "33.32",
     "76.20",
     "4.06"
    ],
    [
     "1-1/4",
     "1.25",
     "wide",
     "1.312",
     "3.500",
     "0.250",
     "33.32",
     "88.90",
     "6.35"
    ],
    [
     "1-1/2",
     "1.5",
     "narrow",
     "1.562",
     "2.750",
     "0.160",
     "39.67",
     "69.85",
     "4.06"
    ],
    [
     "1-1/2",
     "1.5",
     "regular",
     "1.562",
     "3.500",
     "0.250",
     "39.67",
     "88.90",
     "6.35"
    ],
    [
     "1-1/2",
     "1.5",
     "wide",
     "1.562",
     "4.000",
     "0.250",
     "39.67",
     "101.60",
     "6.35"
    ],
    [
     "2",
     "2",
     "narrow",
     "2.125",
     "3.750",
     "0.250",
     "53.97",
     "95.25",
     "6.35"
    ],
    [
     "2",
     "2",
     "regular",
     "2.125",
     "4.500",
     "0.250",
     "53.97",
     "114.30",
     "6.35"
    ],
    [
     "2",
     "2",
     "wide",
     "2.125",
     "5.000",
     "0.250",
     "53.97",
     "127.00",
     "6.35"
    ],
    [
     "3",
     "3",
     "narrow",
     "3.125",
     "5.500",
     "0.375",
     "79.38",
     "139.70",
     "9.52"
    ],
    [
     "3",
     "3",
     "regular",
     "3.125",
     "6.500",
     "0.375",
     "79.38",
     "165.10",
     "9.52"
    ],
    [
     "3",
     "3",
     "wide",
     "3.125",
     "7.000",
     "0.375",
     "79.38",
     "177.80",
     "9.52"
    ]
   ]
  }
 },
 "sheet_text": "Plain washers, inch Type B (narrow, regular, wide): #0 to 3 in ID, OD, thickness + 12 washer files — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/plain-washers-inch-type-b/  (sheet CC BY 4.0)\nBasis: Tubing China's ANSI Type B flat washer table (#0 to 3 in), checked against Portland Bolt's Type B table (1/4 to 3 in, same ID, OD and thickness on every row read) and Fastener SuperStore's narrow-series limits; twelve washer files\nCatalog version: 2026-10-20\n\nOverall (mm): length 63.5, width 63.5, height 4.1\n- Type B plain washers come in three series for each screw size: narrow (N), regular (R) and wide (W), with a bore that is the same across the three. Dimensions are basic inches with computed mm columns. Basic ID, OD and thickness are the same in Tubing China's and Portland Bolt's tables for every size from 1/4 to 3 in. Fastener SuperStore's narrow-series table (labelled ASME B18.21.1-2009) prints limits that fit the same basics: 1/4 in ID 0.296 / 0.276 around 0.281, OD 0.515 / 0.495 around 0.500, thickness 0.071 / 0.056 around 0.063 (and the same pattern at 3/8, 1/2 in). Standard naming varies by source: Portland Bolt's page is titled 'Type B plain washers', Fastener SuperStore cites ASME B18.21.1-2009, and Engineers Edge's Type A table is credited to ANSI/ASME B18.22.1. Check the edition you buy to.\n- Portland Bolt prints some obvious slips (a tolerance of 0.303 and a 1-in narrow maximum thickness of 0.122); basic values are used, not tolerances. The Portland Bolt table has the thickness header shifted by one column; its 'basic' thickness (0.063 for 1/4 narrow) is the one used. Portland Bolt's 7/8 and 1 in series rows and the extra half sizes were not all compared.\n- Type A (SAE narrow / USS wide) washers, 1/4 to 3/4 in, are on flat-washers-inch. Type B is the series with a bore that is about 0.031 in over the screw for the same series, so the 1/4 in Type B wide washer (ID 0.281, OD 1.000) is not the 1/4 in USS Type A washer (ID 0.312, OD 0.734).\n- Files are Xem-drawn flat annuli at the basic sizes for 1/4, 3/8, 1/2 and 3/4 in in all three series; thickness is the basic value. McMaster-Carr sells these washers with per-part STEP; no category URL could be verified, so none is linked.\n\nscrew size  decimal size (in)  series  ID (in)  OD (in)  thickness (in)  ID (mm)  OD (mm)  thickness (mm)\n#0  0.06  narrow  0.068  0.125  0.025  1.73  3.17  0.64\n#0  0.06  regular  0.068  0.188  0.025  1.73  4.78  0.64\n#0  0.06  wide  0.068  0.250  0.025  1.73  6.35  0.64\n#1  0.073  narrow  0.084  0.156  0.025  2.13  3.96  0.64\n#1  0.073  regular  0.084  0.219  0.025  2.13  5.56  0.64\n#1  0.073  wide  0.084  0.281  0.032  2.13  7.14  0.81\n#2  0.086  narrow  0.094  0.188  0.025  2.39  4.78  0.64\n#2  0.086  regular  0.094  0.250  0.032  2.39  6.35  0.81\n#2  0.086  wide  0.094  0.344  0.032  2.39  8.74  0.81\n#3  0.099  narrow  0.109  0.219  0.025  2.77  5.56  0.64\n#3  0.099  regular  0.109  0.312  0.032  2.77  7.92  0.81\n#3  0.099  wide  0.109  0.406  0.040  2.77  10.31  1.02\n#4  0.112  narrow  0.125  0.250  0.032  3.17  6.35  0.81\n#4  0.112  regular  0.125  0.375  0.040  3.17  9.52  1.02\n#4  0.112  wide  0.125  0.438  0.040  3.17  11.13  1.02\n#5  0.125  narrow  0.141  0.281  0.032  3.58  7.14  0.81\n#5  0.125  regular  0.141  0.406  0.040  3.58  10.31  1.02\n#5  0.125  wide  0.141  0.500  0.040  3.58  12.70  1.02\n#6  0.138  narrow  0.156  0.312  0.032  3.96  7.92  0.81\n#6  0.138  regular  0.156  0.438  0.040  3.96  11.13  1.02\n#6  0.138  wide  0.156  0.562  0.040  3.96  14.27  1.02\n#8  0.164  narrow  0.188  0.375  0.040  4.78  9.52  1.02\n#8  0.164  regular  0.188  0.500  0.040  4.78  12.70  1.02\n#8  0.164  wide  0.188  0.625  0.063  4.78  15.88  1.60\n#10  0.19  narrow  0.203  0.406  0.040  5.16  10.31  1.02\n#10  0.19  regular  0.203  0.562  0.040  5.16  14.27  1.02\n#10  0.19  wide  0.203  0.734  0.063  5.16  18.64  1.60\n#12  0.216  narrow  0.234  0.438  0.040  5.94  11.13  1.02\n#12  0.216  regular  0.234  0.625  0.063  5.94  15.88  1.60\n#12  0.216  wide  0.234  0.875  0.063  5.94  22.22  1.60\n1/4  0.25  narrow  0.281  0.500  0.063  7.14  12.70  1.60\n1/4  0.25  regular  0.281  0.734  0.063  7.14  18.64  1.60\n1/4  0.25  wide  0.281  1.000  0.063  7.14  25.40  1.60\n5/16  0.3125  narrow  0.344  0.625  0.063  8.74  15.88  1.60\n5/16  0.3125  regular  0.344  0.875  0.063  8.74  22.22  1.60\n5/16  0.3125  wide  0.344  1.125  0.063  8.74  28.57  1.60\n3/8  0.375  narrow  0.406  0.734  0.063  10.31  18.64  1.60\n3/8  0.375  regular  0.406  1.000  0.063  10.31  25.40  1.60\n3/8  0.375  wide  0.406  1.250  0.100  10.31  31.75  2.54\n7/16  0.4375  narrow  0.469  0.875  0.063  11.91  22.22  1.60\n7/16  0.4375  regular  0.469  1.125  0.063  11.91  28.57  1.60\n7/16  0.4375  wide  0.469  1.469  0.100  11.91  37.31  2.54\n1/2  0.5  narrow  0.531  1.000  0.063  13.49  25.40  1.60\n1/2  0.5  regular  0.531  1.250  0.100  13.49  31.75  2.54\n1/2  0.5  wide  0.531  1.750  0.100  13.49  44.45  2.54\n9/16  0.5625  narrow  0.594  1.125  0.063  15.09  28.57  1.60\n9/16  0.5625  regular  0.594  1.469  0.100  15.09  37.31  2.54\n9/16  0.5625  wide  0.594  2.000  0.100  15.09  50.80  2.54\n5/8  0.625  narrow  0.656  1.250  0.100  16.66  31.75  2.54\n5/8  0.625  regular  0.656  1.750  0.100  16.66  44.45  2.54\n5/8  0.625  wide  0.656  2.250  0.160  16.66  57.15  4.06\n3/4  0.75  narrow  0.812  1.375  0.100  20.62  34.92  2.54\n3/4  0.75  regular  0.812  2.000  0.100  20.62  50.80  2.54\n3/4  0.75  wide  0.812  2.500  0.160  20.62  63.50  4.06\n7/8  0.875  narrow  0.938  1.469  0.100  23.83  37.31  2.54\n7/8  0.875  regular  0.938  2.250  0.160  23.83  57.15  4.06\n7/8  0.875  wide  0.938  2.750  0.160  23.83  69.85  4.06\n1  1  narrow  1.062  1.750  0.100  26.97  44.45  2.54\n1  1  regular  1.062  2.500  0.160  26.97  63.50  4.06\n1  1  wide  1.062  3.000  0.160  26.97  76.20  4.06\n1-1/8  1.125  narrow  1.188  2.000  0.100  30.18  50.80  2.54\n1-1/8  1.125  regular  1.188  2.750  0.160  30.18  69.85  4.06\n1-1/8  1.125  wide  1.188  3.250  0.160  30.18  82.55  4.06\n1-1/4  1.25  narrow  1.312  2.250  0.160  33.32  57.15  4.06\n1-1/4  1.25  regular  1.312  3.000  0.160  33.32  76.20  4.06\n1-1/4  1.25  wide  1.312  3.500  0.250  33.32  88.90  6.35\n1-1/2  1.5  narrow  1.562  2.750  0.160  39.67  69.85  4.06\n1-1/2  1.5  regular  1.562  3.500  0.250  39.67  88.90  6.35\n1-1/2  1.5  wide  1.562  4.000  0.250  39.67  101.60  6.35\n2  2  narrow  2.125  3.750  0.250  53.97  95.25  6.35\n2  2  regular  2.125  4.500  0.250  53.97  114.30  6.35\n2  2  wide  2.125  5.000  0.250  53.97  127.00  6.35\n3  3  narrow  3.125  5.500  0.375  79.38  139.70  9.52\n3  3  regular  3.125  6.500  0.375  79.38  165.10  9.52\n3  3  wide  3.125  7.000  0.375  79.38  177.80  9.52\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Tubing China: Standard ANSI Type B flat washer sizes: No. 0 to 3 in, N / R / W series, ID, OD, thickness — web — Distributor table; numbers only — https://tubingchina.com/Standard-ANSI-Type-B-Flat-Washer-Sizes.htm\n- Portland Bolt: Dimensions of Type B plain washers: narrow / regular / wide, 1/4 to 3 in (ID, OD, thickness basic / max / min) — web — Distributor table; numbers only — https://www.portlandbolt.com/print/?table=9931\n- Fastener SuperStore: Type B plain washers, narrow series (ASME B18.21.1-2009): ID, OD, thickness max / min — web — Distributor table; numbers only — https://www.fastenersuperstore.com/product_specs/washers-flat-type-b-narrow\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 12 parts): https://xemstudio.com/files/hardware/plain-washers-inch-type-b/index.json\nAPI: https://xemstudio.com/api/geometry?object=plain-washers-inch-type-b\n",
 "sources": [
  {
   "publisher": "Tubing China",
   "title": "Standard ANSI Type B flat washer sizes: No. 0 to 3 in, N / R / W series, ID, OD, thickness",
   "url": "https://tubingchina.com/Standard-ANSI-Type-B-Flat-Washer-Sizes.htm",
   "formats": [
    "web"
   ],
   "license": "Distributor table; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Portland Bolt",
   "title": "Dimensions of Type B plain washers: narrow / regular / wide, 1/4 to 3 in (ID, OD, thickness basic / max / min)",
   "url": "https://www.portlandbolt.com/print/?table=9931",
   "formats": [
    "web"
   ],
   "license": "Distributor table; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Fastener SuperStore",
   "title": "Type B plain washers, narrow series (ASME B18.21.1-2009): ID, OD, thickness max / min",
   "url": "https://www.fastenersuperstore.com/product_specs/washers-flat-type-b-narrow",
   "formats": [
    "web"
   ],
   "license": "Distributor table; numbers only",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "flat-washers-inch",
  "flat-washers-metric",
  "hex-nuts-inch",
  "hex-bolts-inch",
  "large-washers-din-9021-iso-7093"
 ],
 "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",
   "exact": "1/4 in 0.281 (7.14 mm), 3/8 in 0.406 (10.31), 1/2 in 0.531 (13.49), 3/4 in 0.812 (20.62)",
   "mates": "bolt of the nominal size; plain cylinder at the major diameter",
   "fit": "designed",
   "files": "washer-type-b-"
  },
  {
   "feature": "outside",
   "exact": "N/R/W: 1/4 in 0.500 / 0.734 / 1.000, 3/8 in 0.734 / 1.000 / 1.250, 1/2 in 1.000 / 1.250 / 1.750, 3/4 in 1.375 / 2.000 / 2.500 in",
   "mates": "round counterbore that seats the washer: Ø = OD + your process clearance",
   "fit": "slide",
   "files": "washer-type-b-"
  }
 ],
 "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 OD of a 3/8 wide Type B washer?",
   "a": "1.250 in (31.75 mm) with 0.406 in bore and 0.100 in thickness (Tubing China and Portland Bolt agree)."
  },
  {
   "q": "What is the difference between narrow, regular and wide washers?",
   "a": "Bore is the same; outside diameter grows: 1/4 in is 0.500, 0.734 and 1.000 in, with thickness 0.063 in in all three."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "washer-type-b-1-4-narrow",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-1-4-narrow.step",
   "stl": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-1-4-narrow.stl",
   "note": "1/4 in Type B plain washer, narrow series: ID 0.281 in (7.14 mm), OD 0.500 in (12.70 mm), thickness 0.063 in (1.60 mm), basic sizes; flat annulus, no tolerances"
  },
  {
   "file": "washer-type-b-1-4-regular",
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   "stl": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-1-4-regular.stl",
   "note": "1/4 in Type B plain washer, regular series: ID 0.281 in (7.14 mm), OD 0.734 in (18.64 mm), thickness 0.063 in (1.60 mm), basic sizes; flat annulus, no tolerances"
  },
  {
   "file": "washer-type-b-1-4-wide",
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   ],
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-1-4-wide.stl",
   "note": "1/4 in Type B plain washer, wide series: ID 0.281 in (7.14 mm), OD 1.000 in (25.40 mm), thickness 0.063 in (1.60 mm), basic sizes; flat annulus, no tolerances"
  },
  {
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-3-8-narrow.stl",
   "note": "3/8 in Type B plain washer, narrow series: ID 0.406 in (10.31 mm), OD 0.734 in (18.64 mm), thickness 0.063 in (1.60 mm), basic sizes; flat annulus, no tolerances"
  },
  {
   "file": "washer-type-b-3-8-regular",
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-3-8-regular.stl",
   "note": "3/8 in Type B plain washer, regular series: ID 0.406 in (10.31 mm), OD 1.000 in (25.40 mm), thickness 0.063 in (1.60 mm), basic sizes; flat annulus, no tolerances"
  },
  {
   "file": "washer-type-b-3-8-wide",
   "formats": [
    "step",
    "stl"
   ],
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-3-8-wide.stl",
   "note": "3/8 in Type B plain washer, wide series: ID 0.406 in (10.31 mm), OD 1.250 in (31.75 mm), thickness 0.100 in (2.54 mm), basic sizes; flat annulus, no tolerances"
  },
  {
   "file": "washer-type-b-1-2-narrow",
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-1-2-narrow.stl",
   "note": "1/2 in Type B plain washer, narrow series: ID 0.531 in (13.49 mm), OD 1.000 in (25.40 mm), thickness 0.063 in (1.60 mm), basic sizes; flat annulus, no tolerances"
  },
  {
   "file": "washer-type-b-1-2-regular",
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    "step",
    "stl"
   ],
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   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-1-2-regular.step",
   "stl": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-1-2-regular.stl",
   "note": "1/2 in Type B plain washer, regular series: ID 0.531 in (13.49 mm), OD 1.250 in (31.75 mm), thickness 0.100 in (2.54 mm), basic sizes; flat annulus, no tolerances"
  },
  {
   "file": "washer-type-b-1-2-wide",
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   ],
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   "stl": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-1-2-wide.stl",
   "note": "1/2 in Type B plain washer, wide series: ID 0.531 in (13.49 mm), OD 1.750 in (44.45 mm), thickness 0.100 in (2.54 mm), basic sizes; flat annulus, no tolerances"
  },
  {
   "file": "washer-type-b-3-4-narrow",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-3-4-narrow.step",
   "stl": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-3-4-narrow.stl",
   "note": "3/4 in Type B plain washer, narrow series: ID 0.812 in (20.62 mm), OD 1.375 in (34.92 mm), thickness 0.100 in (2.54 mm), basic sizes; flat annulus, no tolerances"
  },
  {
   "file": "washer-type-b-3-4-regular",
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   ],
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-3-4-regular.stl",
   "note": "3/4 in Type B plain washer, regular series: ID 0.812 in (20.62 mm), OD 2.000 in (50.80 mm), thickness 0.100 in (2.54 mm), basic sizes; flat annulus, no tolerances"
  },
  {
   "file": "washer-type-b-3-4-wide",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-3-4-wide.step",
   "stl": "https://xemstudio.com/files/hardware/plain-washers-inch-type-b/washer-type-b-3-4-wide.stl",
   "note": "3/4 in Type B plain washer, wide series: ID 0.812 in (20.62 mm), OD 2.500 in (63.50 mm), thickness 0.160 in (4.06 mm), basic sizes; flat annulus, no tolerances"
  }
 ],
 "markdown": "https://xemstudio.com/objects/plain-washers-inch-type-b/index.md"
}