{
 "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": "hex-bolts-inch",
 "name": "Hex bolts, inch: 1/4-20 to 3/4-10 (ASME B18.2.1)",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What wrench fits a 3/8-16 hex bolt?",
 "tags": [
  "bolt",
  "hex bolt",
  "inch",
  "unc"
 ],
 "aliases": [
  "3/8 hex bolt dimensions",
  "1/2-13 bolt head size",
  "inch hex bolt step"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 47,
 "url": "https://xemstudio.com/objects/hex-bolts-inch/",
 "sheet_txt": "https://xemstudio.com/objects/hex-bolts-inch/sheet.txt",
 "sheet": {
  "basis": "ASME B18.2.1 hex bolt / cap screw: width across flats F, head height H (nominal)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Threads are plain cylinders at the major diameter, as every thread on this site.",
   "Length is under the head."
  ],
  "table": {
   "columns": [
    "thread",
    "tpi",
    "af_in",
    "head_h_in",
    "lengths_in"
   ],
   "rows": [
    [
     "1/4-20",
     20,
     0.4375,
     0.1562,
     "0.5, 0.75, 1, 1.25, 1.5, 2, 2.5, 3"
    ],
    [
     "5/16-18",
     18,
     0.5,
     0.2031,
     "0.75, 1, 1.25, 1.5, 2, 2.5, 3"
    ],
    [
     "3/8-16",
     16,
     0.5625,
     0.2344,
     "0.75, 1, 1.25, 1.5, 2, 2.5, 3, 4"
    ],
    [
     "7/16-14",
     14,
     0.625,
     0.2812,
     "1, 1.5, 2, 3"
    ],
    [
     "1/2-13",
     13,
     0.75,
     0.3438,
     "1, 1.25, 1.5, 2, 2.5, 3, 4, 5, 6"
    ],
    [
     "5/8-11",
     11,
     0.9375,
     0.4219,
     "1.5, 2, 3, 4, 5, 6"
    ],
    [
     "3/4-10",
     10,
     1.125,
     0.5,
     "2, 3, 4, 5, 6"
    ]
   ]
  }
 },
 "sheet_text": "Hex bolts, inch: 1/4-20 to 3/4-10 (ASME B18.2.1) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/hex-bolts-inch/  (CC BY 4.0)\nBasis: ASME B18.2.1 hex bolt / cap screw: width across flats F, head height H (nominal)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Threads are plain cylinders at the major diameter, as every thread on this site.\n- Length is under the head.\n\nthread  tpi  af_in  head_h_in  lengths_in\n1/4-20  20  0.4375  0.1562  0.5, 0.75, 1, 1.25, 1.5, 2, 2.5, 3\n5/16-18  18  0.5  0.2031  0.75, 1, 1.25, 1.5, 2, 2.5, 3\n3/8-16  16  0.5625  0.2344  0.75, 1, 1.25, 1.5, 2, 2.5, 3, 4\n7/16-14  14  0.625  0.2812  1, 1.5, 2, 3\n1/2-13  13  0.75  0.3438  1, 1.25, 1.5, 2, 2.5, 3, 4, 5, 6\n5/8-11  11  0.9375  0.4219  1.5, 2, 3, 4, 5, 6\n3/4-10  10  1.125  0.5  2, 3, 4, 5, 6\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- ASME: ASME B18.2.1 Square, hex, heavy hex and askew head bolts and hex, heavy hex, hex flange, lobed head and lag screws (inch) — standard — ASME; dimensions are facts [verify license at link] — https://www.asme.org/codes-standards/find-codes-standards/b18-2-1-square-hex-heavy-hex-askew-head-bolts-hex-heavy-hex-hex-flange-lobed-head-lag-screws-inch-series\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 47 parts): https://xemstudio.com/files/hardware/hex-bolts-inch/index.json\nAPI: https://xemstudio.com/api/geometry?object=hex-bolts-inch\n",
 "sources": [
  {
   "publisher": "ASME",
   "title": "ASME B18.2.1 Square, hex, heavy hex and askew head bolts and hex, heavy hex, hex flange, lobed head and lag screws (inch)",
   "url": "https://www.asme.org/codes-standards/find-codes-standards/b18-2-1-square-hex-heavy-hex-askew-head-bolts-hex-heavy-hex-hex-flange-lobed-head-lag-screws-inch-series",
   "formats": [
    "standard"
   ],
   "license": "ASME; 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": [
  "hex-nuts-inch",
  "flat-washers-inch",
  "socket-head-cap-screws-inch",
  "button-head-socket-screws-inch",
  "imperial-machine-screws"
 ],
 "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": "3/8-16 bolt head?",
   "a": "9/16 in across flats, 15/64 in high."
  }
 ],
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    "stl"
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   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x1.5in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x1.5in.stl",
   "note": "1/2-13 × 1.5 in hex bolt: 0.75 in AF, head 0.3438 in"
  },
  {
   "file": "hex-bolt-1-2-13x2in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x2in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x2in.stl",
   "note": "1/2-13 × 2 in hex bolt: 0.75 in AF, head 0.3438 in"
  },
  {
   "file": "hex-bolt-1-2-13x2.5in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x2.5in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x2.5in.stl",
   "note": "1/2-13 × 2.5 in hex bolt: 0.75 in AF, head 0.3438 in"
  },
  {
   "file": "hex-bolt-1-2-13x3in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x3in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x3in.stl",
   "note": "1/2-13 × 3 in hex bolt: 0.75 in AF, head 0.3438 in"
  },
  {
   "file": "hex-bolt-1-2-13x4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x4in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x4in.stl",
   "note": "1/2-13 × 4 in hex bolt: 0.75 in AF, head 0.3438 in"
  },
  {
   "file": "hex-bolt-1-2-13x5in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x5in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x5in.stl",
   "note": "1/2-13 × 5 in hex bolt: 0.75 in AF, head 0.3438 in"
  },
  {
   "file": "hex-bolt-1-2-13x6in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x6in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-1-2-13x6in.stl",
   "note": "1/2-13 × 6 in hex bolt: 0.75 in AF, head 0.3438 in"
  },
  {
   "file": "hex-bolt-5-8-11x1.5in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x1.5in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x1.5in.stl",
   "note": "5/8-11 × 1.5 in hex bolt: 0.9375 in AF, head 0.4219 in"
  },
  {
   "file": "hex-bolt-5-8-11x2in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x2in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x2in.stl",
   "note": "5/8-11 × 2 in hex bolt: 0.9375 in AF, head 0.4219 in"
  },
  {
   "file": "hex-bolt-5-8-11x3in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x3in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x3in.stl",
   "note": "5/8-11 × 3 in hex bolt: 0.9375 in AF, head 0.4219 in"
  },
  {
   "file": "hex-bolt-5-8-11x4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x4in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x4in.stl",
   "note": "5/8-11 × 4 in hex bolt: 0.9375 in AF, head 0.4219 in"
  },
  {
   "file": "hex-bolt-5-8-11x5in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x5in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x5in.stl",
   "note": "5/8-11 × 5 in hex bolt: 0.9375 in AF, head 0.4219 in"
  },
  {
   "file": "hex-bolt-5-8-11x6in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x6in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-5-8-11x6in.stl",
   "note": "5/8-11 × 6 in hex bolt: 0.9375 in AF, head 0.4219 in"
  },
  {
   "file": "hex-bolt-3-4-10x2in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x2in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x2in.stl",
   "note": "3/4-10 × 2 in hex bolt: 1.125 in AF, head 0.5 in"
  },
  {
   "file": "hex-bolt-3-4-10x3in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x3in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x3in.stl",
   "note": "3/4-10 × 3 in hex bolt: 1.125 in AF, head 0.5 in"
  },
  {
   "file": "hex-bolt-3-4-10x4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x4in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x4in.stl",
   "note": "3/4-10 × 4 in hex bolt: 1.125 in AF, head 0.5 in"
  },
  {
   "file": "hex-bolt-3-4-10x5in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x5in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x5in.stl",
   "note": "3/4-10 × 5 in hex bolt: 1.125 in AF, head 0.5 in"
  },
  {
   "file": "hex-bolt-3-4-10x6in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x6in.step",
   "stl": "https://xemstudio.com/files/hardware/hex-bolts-inch/hex-bolt-3-4-10x6in.stl",
   "note": "3/4-10 × 6 in hex bolt: 1.125 in AF, head 0.5 in"
  }
 ],
 "markdown": "https://xemstudio.com/objects/hex-bolts-inch/index.md"
}