{
 "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": "socket-head-cap-screws-inch",
 "name": "Socket head cap screws, inch: #10-24, #10-32, 5/16-18, 3/8-16, 1/2-13 (ASME B18.3)",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What are the dimensions of a 5/16-18 socket head cap screw?",
 "tags": [
  "screw",
  "socket screw",
  "inch",
  "unc",
  "t-slot",
  "fastener"
 ],
 "aliases": [
  "5/16-18 shcs",
  "5/16 socket head cap screw dimensions",
  "inch socket head cap screw step",
  "15 series t-slot screw",
  "3/8-16 shcs",
  "1/2-13 socket cap screw"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 25,
 "url": "https://xemstudio.com/objects/socket-head-cap-screws-inch/",
 "sheet_txt": "https://xemstudio.com/objects/socket-head-cap-screws-inch/sheet.txt",
 "sheet": {
  "basis": "ASME B18.3 inch socket screws: head diameter A (max), head height H, hex socket J; thread drawn as a plain cylinder at the major diameter",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "The inch sizes above 1/4-20 (the #4 to 1/4-20 sizes are on the imperial machine screws page). 5/16-18 is the screw for 15-series (1.5 in) T-slot brackets, gussets and slide-in T-nuts; 1/4-20 for 10-series.",
   "Length is under the head. Threads are plain cylinders at the major diameter."
  ],
  "table": {
   "columns": [
    "size",
    "major_mm",
    "tpi",
    "head_dia_mm",
    "head_h_mm",
    "hex_key_in",
    "lengths_in"
   ],
   "rows": [
    [
     "#10-24",
     4.826,
     24,
     7.92,
     4.83,
     "5/32",
     "0.375, 0.5, 0.625, 0.75, 1"
    ],
    [
     "#10-32",
     4.826,
     32,
     7.92,
     4.83,
     "5/32",
     "0.375, 0.5, 0.75, 1"
    ],
    [
     "5/16-18",
     7.938,
     18,
     11.91,
     7.94,
     "1/4",
     "0.5, 0.625, 0.75, 1, 1.25, 1.5, 2"
    ],
    [
     "3/8-16",
     9.525,
     16,
     14.27,
     9.52,
     "5/16",
     "0.75, 1, 1.25, 1.5, 2"
    ],
    [
     "1/2-13",
     12.7,
     13,
     19.05,
     12.7,
     "3/8",
     "1, 1.5, 2, 2.5"
    ]
   ]
  }
 },
 "sheet_text": "Socket head cap screws, inch: #10-24, #10-32, 5/16-18, 3/8-16, 1/2-13 (ASME B18.3) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/socket-head-cap-screws-inch/  (CC BY 4.0)\nBasis: ASME B18.3 inch socket screws: head diameter A (max), head height H, hex socket J; thread drawn as a plain cylinder at the major diameter\nCatalog version: 2026-10-20\n\nSizes: see table below\n- The inch sizes above 1/4-20 (the #4 to 1/4-20 sizes are on the imperial machine screws page). 5/16-18 is the screw for 15-series (1.5 in) T-slot brackets, gussets and slide-in T-nuts; 1/4-20 for 10-series.\n- Length is under the head. Threads are plain cylinders at the major diameter.\n\nsize  major_mm  tpi  head_dia_mm  head_h_mm  hex_key_in  lengths_in\n#10-24  4.826  24  7.92  4.83  5/32  0.375, 0.5, 0.625, 0.75, 1\n#10-32  4.826  32  7.92  4.83  5/32  0.375, 0.5, 0.75, 1\n5/16-18  7.938  18  11.91  7.94  1/4  0.5, 0.625, 0.75, 1, 1.25, 1.5, 2\n3/8-16  9.525  16  14.27  9.52  5/16  0.75, 1, 1.25, 1.5, 2\n1/2-13  12.7  13  19.05  12.7  3/8  1, 1.5, 2, 2.5\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- ASME: B18.3 Socket cap, shoulder, set screws, hex and spline keys (inch series): head diameter, height, hex socket — standard — ASME; dimensions are facts [verify license at link] — https://www.asme.org/codes-standards/find-codes-standards/b18-3-socket-cap-shoulder-set-screws-hex-spline-keys-inch-series\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 25 parts): https://xemstudio.com/files/hardware/socket-head-cap-screws-inch/index.json\nAPI: https://xemstudio.com/api/geometry?object=socket-head-cap-screws-inch\n",
 "sources": [
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   "publisher": "ASME",
   "title": "B18.3 Socket cap, shoulder, set screws, hex and spline keys (inch series): head diameter, height, hex socket",
   "url": "https://www.asme.org/codes-standards/find-codes-standards/b18-3-socket-cap-shoulder-set-screws-hex-spline-keys-inch-series",
   "formats": [
    "standard"
   ],
   "license": "ASME; dimensions are facts",
   "license_verified": false,
   "hosted": false
  }
 ],
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  "sheet_free": true,
  "mesh_price_usd": null,
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  "tolerance_mm": null
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 "related": [
  "imperial-machine-screws",
  "button-head-socket-screws-inch",
  "1515-t-slot-extrusion-inch",
  "t-slot-corner-brackets"
 ],
 "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": "What is the head of a 5/16-18 SHCS?",
   "a": "Ø0.469 in (11.91 mm) × 0.3125 in (7.94 mm) high, 1/4 in hex key."
  }
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