{
 "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": "split-key-rings",
 "name": "Split key rings 1/2 to 1-1/4 in: outside diameter, inside diameter and wire diameter (Key Ring maker table)",
 "kind": "standard",
 "category": "Mechanisms",
 "group": "Mechanism parts",
 "year": null,
 "question": "What is the actual outside diameter and wire diameter of a 1 inch split key ring?",
 "tags": [
  "split ring",
  "key ring",
  "keychain ring",
  "split key ring",
  "key ring size",
  "wire ring",
  "lanyard ring",
  "tool"
 ],
 "aliases": [
  "split key ring dimensions",
  "1 inch key ring outside diameter",
  "key ring wire diameter",
  "3/4 inch split ring size",
  "key ring inside diameter",
  "1/2 inch split ring od",
  "split ring size chart",
  "key ring od vs id",
  "1-1/4 inch key ring dimensions",
  "keychain split ring thickness"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/split-key-rings/",
 "sheet_txt": "https://xemstudio.com/objects/split-key-rings/sheet.txt",
 "sheet": {
  "basis": "four keyring.com product pages (actual dimensions per nominal size); numbers only. mm values are the inch figures × 25.4",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A split key ring is sold by a nominal diameter ('1 in'), which is approximate: keyring.com's actual figures are, for the stainless 1 in ring, outside diameter 1.100 in, inside diameter 0.932 in, wire diameter 0.072 in; for the 1/2 in stainless ring 0.670 / 0.510 / 0.050 in. Its pages also print dimensions called A and B for each ring (A .070 to .090 in, B .105 to .130 in); the pages do not define A and B, so the meanings are not given here.",
   "Different materials and origins of the same nominal size differ: the 3/4 in solid-brass ring is 0.875 in outside diameter and the 3/4 in stainless ring is listed at 0.880 in (its other dimensions are not printed). One page lists the 1-1/4 in ring as 'approximately 33 mm' outside diameter, against 1.255 in (31.9 mm) in its table; the table values are used. The 1 in nickel-plated and the 1-1/2 and 2 in rings are listed without dimensions in the pages read, and a retailer page for a 2 in Lucky Line ring gives only '2 in diameter' without saying outside or inside, so none of these is tabulated.",
   "S-hooks and other closed ring types were not tabulated: no maker table with wire diameter and opening was read. A split ring is two turns of wire; the turn spacing is not defined by the numbers published, so no ring is drawn.",
   "No file. McMaster-Carr lists split rings and tag rings with per-part CAD; linked, not copied. Ball chain, which also ends in a split ring or connector: ball-chain-sizes."
  ],
  "table": {
   "columns": [
    "ring",
    "nominal",
    "outside diameter",
    "inside diameter",
    "wire diameter",
    "A / B (as printed)"
   ],
   "rows": [
    [
     "stainless steel, USA (type 304, spring tempered)",
     "1/2 in",
     ".670 in (17.02 mm)",
     ".510 in (12.95 mm)",
     ".050 in (1.27 mm)",
     ".070 / .105 in"
    ],
    [
     "solid brass, USA",
     "3/4 in",
     ".875 in (22.22 mm)",
     ".707 in (17.96 mm)",
     ".072 in (1.83 mm)",
     ".084 / .110 in"
    ],
    [
     "stainless steel, USA",
     "1 in",
     "1.100 in (27.94 mm)",
     ".932 in (23.67 mm)",
     ".072 in (1.83 mm)",
     ".084 / .110 in"
    ],
    [
     "nickel plated, China",
     "1-1/4 in",
     "1.255 in (31.88 mm)",
     "1.060 in (26.92 mm)",
     ".090 in (2.29 mm)",
     ".090 / .130 in"
    ]
   ]
  }
 },
 "sheet_text": "Split key rings 1/2 to 1-1/4 in: outside diameter, inside diameter and wire diameter (Key Ring maker table) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/split-key-rings/  (sheet CC BY 4.0)\nBasis: four keyring.com product pages (actual dimensions per nominal size); numbers only. mm values are the inch figures × 25.4\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A split key ring is sold by a nominal diameter ('1 in'), which is approximate: keyring.com's actual figures are, for the stainless 1 in ring, outside diameter 1.100 in, inside diameter 0.932 in, wire diameter 0.072 in; for the 1/2 in stainless ring 0.670 / 0.510 / 0.050 in. Its pages also print dimensions called A and B for each ring (A .070 to .090 in, B .105 to .130 in); the pages do not define A and B, so the meanings are not given here.\n- Different materials and origins of the same nominal size differ: the 3/4 in solid-brass ring is 0.875 in outside diameter and the 3/4 in stainless ring is listed at 0.880 in (its other dimensions are not printed). One page lists the 1-1/4 in ring as 'approximately 33 mm' outside diameter, against 1.255 in (31.9 mm) in its table; the table values are used. The 1 in nickel-plated and the 1-1/2 and 2 in rings are listed without dimensions in the pages read, and a retailer page for a 2 in Lucky Line ring gives only '2 in diameter' without saying outside or inside, so none of these is tabulated.\n- S-hooks and other closed ring types were not tabulated: no maker table with wire diameter and opening was read. A split ring is two turns of wire; the turn spacing is not defined by the numbers published, so no ring is drawn.\n- No file. McMaster-Carr lists split rings and tag rings with per-part CAD; linked, not copied. Ball chain, which also ends in a split ring or connector: ball-chain-sizes.\n\nring  nominal  outside diameter  inside diameter  wire diameter  A / B (as printed)\nstainless steel, USA (type 304, spring tempered)  1/2 in  .670 in (17.02 mm)  .510 in (12.95 mm)  .050 in (1.27 mm)  .070 / .105 in\nsolid brass, USA  3/4 in  .875 in (22.22 mm)  .707 in (17.96 mm)  .072 in (1.83 mm)  .084 / .110 in\nstainless steel, USA  1 in  1.100 in (27.94 mm)  .932 in (23.67 mm)  .072 in (1.83 mm)  .084 / .110 in\nnickel plated, China  1-1/4 in  1.255 in (31.88 mm)  1.060 in (26.92 mm)  .090 in (2.29 mm)  .090 / .130 in\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Key Ring (keyring.com): Split key rings: stainless 1/2 in USA, solid brass 3/4 in USA, stainless 1 in USA, nickel plated 1-1/4 in (China): outside / inside / wire diameter, A and B dimensions — web — Maker page; numbers only — https://www.keyring.com/stainless-steel-split-keyring-1_2-diameter-usa.aspx\n- Key Ring (keyring.com): Solid brass split key ring 3/4 in (USA), actual dimensions — web — Maker page; numbers only — https://keyring.com/solid-brass-split-key-ring-3-4-inch-diameter-usa\n- Key Ring (keyring.com): Stainless steel split key ring 1 in (USA) — web — Maker page; numbers only — https://keyring.com/stainlesssteelsplitkeyring1diameterusa.aspx\n- Key Ring (keyring.com): Split key ring 1-1/4 in nickel plated (China) — web — Maker page; numbers only — https://keyring.com/split-key-ring-1-1-4-inch-diameter-nickel-plated-china\n- McMaster-Carr: Split key rings and tag rings (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/chain/tag-rings-6\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=split-key-rings\n",
 "sources": [
  {
   "publisher": "Key Ring (keyring.com)",
   "title": "Split key rings: stainless 1/2 in USA, solid brass 3/4 in USA, stainless 1 in USA, nickel plated 1-1/4 in (China): outside / inside / wire diameter, A and B dimensions",
   "url": "https://www.keyring.com/stainless-steel-split-keyring-1_2-diameter-usa.aspx",
   "formats": [
    "web"
   ],
   "license": "Maker page; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Key Ring (keyring.com)",
   "title": "Solid brass split key ring 3/4 in (USA), actual dimensions",
   "url": "https://keyring.com/solid-brass-split-key-ring-3-4-inch-diameter-usa",
   "formats": [
    "web"
   ],
   "license": "Maker page; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Key Ring (keyring.com)",
   "title": "Stainless steel split key ring 1 in (USA)",
   "url": "https://keyring.com/stainlesssteelsplitkeyring1diameterusa.aspx",
   "formats": [
    "web"
   ],
   "license": "Maker page; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Key Ring (keyring.com)",
   "title": "Split key ring 1-1/4 in nickel plated (China)",
   "url": "https://keyring.com/split-key-ring-1-1-4-inch-diameter-nickel-plated-china",
   "formats": [
    "web"
   ],
   "license": "Maker page; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Split key rings and tag rings (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/chain/tag-rings-6",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "ball-chain-sizes",
  "eye-bolts-din-580",
  "shoulder-eye-bolts-inch"
 ],
 "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": [],
 "faq": [
  {
   "q": "What is the outside diameter of a 1 in split key ring?",
   "a": "1.100 in (27.9 mm) for keyring.com's stainless 1 in ring, inside diameter 0.932 in (23.7 mm), wire 0.072 in (1.83 mm). The nominal 1 in is approximate."
  },
  {
   "q": "What is the wire diameter of a 1/2 in split ring?",
   "a": "0.050 in (1.27 mm) for keyring.com's stainless 1/2 in ring (outside diameter 0.670 in, inside 0.510 in)."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/split-key-rings/index.md"
}