{
 "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": "button-head-socket-screws-inch",
 "name": "Button head socket cap screws, inch: #4-40 to 1/2-13 (ASME B18.3)",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What are the dimensions of a 5/16-18 button head socket cap screw?",
 "tags": [
  "screw",
  "socket screw",
  "inch",
  "unc",
  "t-slot",
  "fastener"
 ],
 "aliases": [
  "5/16-18 bhcs",
  "button head cap screw dimensions inch",
  "1/4-20 button head",
  "t-slot button head screw",
  "bhcs step file"
 ],
 "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/button-head-socket-screws-inch/",
 "sheet_txt": "https://xemstudio.com/objects/button-head-socket-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 low-profile screw T-slot framing uses on brackets and panels: 1/4-20 for 10-series, 5/16-18 for 15-series. Length is under the head; the head is a dome to height H over diameter A."
  ],
  "table": {
   "columns": [
    "size",
    "major_mm",
    "tpi",
    "head_dia_mm",
    "head_h_mm",
    "hex_key_in",
    "lengths_in"
   ],
   "rows": [
    [
     "#4-40",
     2.845,
     40,
     5.41,
     1.5,
     "1/16",
     "0.25, 0.375, 0.5"
    ],
    [
     "#6-32",
     3.505,
     32,
     6.65,
     1.83,
     "5/64",
     "0.25, 0.375, 0.5"
    ],
    [
     "#8-32",
     4.166,
     32,
     7.92,
     2.11,
     "3/32",
     "0.375, 0.5"
    ],
    [
     "#10-24",
     4.826,
     24,
     9.17,
     2.54,
     "1/8",
     "0.375, 0.5, 0.75"
    ],
    [
     "#10-32",
     4.826,
     32,
     9.17,
     2.54,
     "1/8",
     "0.375, 0.5"
    ],
    [
     "1/4-20",
     6.35,
     20,
     11.1,
     3.35,
     "5/32",
     "0.375, 0.5, 0.625, 0.75, 1"
    ],
    [
     "5/16-18",
     7.938,
     18,
     13.89,
     4.22,
     "3/16",
     "0.5, 0.625, 0.75, 1"
    ],
    [
     "3/8-16",
     9.525,
     16,
     16.66,
     5.05,
     "7/32",
     "0.75, 1"
    ],
    [
     "1/2-13",
     12.7,
     13,
     22.22,
     6.73,
     "5/16",
     "1"
    ]
   ]
  }
 },
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 "sources": [
  {
   "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,
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  "tolerance_mm": null
 },
 "related": [
  "socket-head-cap-screws-inch",
  "imperial-machine-screws",
  "1515-t-slot-extrusion-inch",
  "t-slot-joining-plates"
 ],
 "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 BHCS?",
   "a": "Ø0.547 in (13.89 mm) × 0.166 in (4.22 mm) high, 3/16 in hex key."
  }
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}