{
 "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": "pipe-plugs-npt-square-hex-socket",
 "name": "NPT pipe plugs: square head, hex head, round head and hex socket (ASME B16.11; Dryseal NPTF, flush PTF) 1/16 to 6 in — head size, length, socket + envelope models",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What are the head and socket sizes of a 1/4 or 1/2 NPT pipe plug?",
 "tags": [
  "pipe plug",
  "npt plug",
  "square head plug",
  "hex head plug",
  "hex socket plug",
  "allen pipe plug",
  "asme b16.11",
  "dryseal plug",
  "fastener"
 ],
 "aliases": [
  "npt plug dimensions",
  "1/4 npt hex socket plug allen key size",
  "1/8 npt plug hex size",
  "1/2 npt square head plug dimensions",
  "3/8 npt socket plug key size",
  "npt pipe plug head size",
  "1/4 npt plug length",
  "asme b16.11 square head plug",
  "3/4 npt plug allen key size",
  "npt plug stl step",
  "1/8 npt plug tap drill",
  "hex socket pipe plug torque"
 ],
 "overall_mm": {
  "length": 7.9,
  "width": 7.9,
  "height": 8.2
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 18,
 "url": "https://xemstudio.com/objects/pipe-plugs-npt-square-hex-socket/",
 "sheet_txt": "https://xemstudio.com/objects/pipe-plugs-npt-square-hex-socket/sheet.txt",
 "sheet": {
  "basis": "Penn Machine's forged square head plug catalog (inches), wermac.org's ASME B16.11 plug tables (mm), and Alma Bolt's and American Fastener's hex socket plug sheets (inches); 18 hex-socket plug envelopes as files",
  "overall_mm": {
   "length": 7.9,
   "width": 7.9,
   "height": 8.2
  },
  "notes": [
   "Square head plugs (forged steel, ASME B16.11 family), Penn Machine, inches, 1/8 to 6: A, B, C and the thread length L, with weights. The text read does not define the letters. They were matched to wermac.org's mm table: Penn A tracks wermac's B (width across flats: 1/2 → 0.563 in = 14.3 mm against 14; 1 → 0.813 in = 20.6 mm against 21; 2 → 1.313 in = 33.3 mm against 32), Penn B tracks wermac's E (length: 3/4 → 0.625 in = 15.9 against 16; 2 → 0.880 in = 22.4 against 22) and Penn C tracks wermac's C (square height: 1/2 → 0.380 in = 9.7 mm against 10). That matching is the Xem reading, not a statement of either source. At 4 in Penn's A is 2.500 in (63.5 mm) against wermac's 65 mm. The mm tables are minimum values (wermac: 'min'), so small differences are expected.",
   "wermac.org tables are third-party transcriptions of ASME B16.11 plugs, mm, NPS 1/2 to 4, with the page's own letters; there is no hex-socket table on that page (hex-socket plugs are not an ASME B16.11 product in the sources read). In the round head table the 2-1/2 length E is 37 where hex and square give 27; probably a typo, shown as printed. A hex-head table from a cast stainless catalog (150# CSS) was read but its columns could not be assigned, so it is not used.",
   "Hex socket plugs: Alma Bolt prints two series with the same columns, Dryseal NPTF (1/16 to 2) and flush PTF (1/16 to 1-1/4): OD D, threads per inch, hex socket J (across flats), key engagement T (min), wall G (min), overall length L (max / min), tightening torque, tap drill. American Fastener's flush-seal sheet has the same numbers as Alma's PTF rows. Alma does not define L or G; American Fastener's headers are compressed, so L as overall length and G as wall thickness follow the order of its columns. Alma heads the NPTF table 'tapered 3/4 in diameter per foot' and the flush PTF table 'tapered 7/8 in diameter per foot'. See npt-thread-dimensions-asme-b1-20-1 for the thread numbers.",
   "Files: straight cylinders at the OD D with the L max overall length and a flat-bottomed hex socket of J across flats and T min depth, 10 Dryseal NPTF sizes and 8 flush PTF sizes. The real thread is tapered; here the printed OD D is carried as a plain cylinder at that diameter (taper not drawn). Square-head and hex-head plugs have no file: their head edges, chamfers and thread dimensions are not given as numbers that define the shape. Countersunk hex head plugs are not tabulated (no source read).",
   "McMaster-Carr sells pipe plugs (square, hex head, socket, SAE J531 etc.) with per-part STEP; its SAE J531 and steel socket plug categories are linked, not copied."
  ],
  "table": {
   "columns": [
    "table (source)",
    "NPS",
    "TPI",
    "across flats / OD",
    "head height",
    "length / thread length",
    "key engagement T",
    "wall G",
    "torque",
    "tap drill",
    "note"
   ],
   "rows": [
    [
     "square head plug, Penn Machine (in)",
     "1/8",
     "—",
     "A 0.281",
     "C 0.250",
     "B 0.380; thread L 0.273",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 0.02 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "1/4",
     "—",
     "A 0.380",
     "C 0.250",
     "B 0.440; thread L 0.395",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 0.03 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "3/8",
     "—",
     "A 0.440",
     "C 0.313",
     "B 0.500; thread L 0.407",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 0.06 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "1/2",
     "—",
     "A 0.563",
     "C 0.380",
     "B 0.563; thread L 0.534",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 0.11 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "3/4",
     "—",
     "A 0.625",
     "C 0.440",
     "B 0.625; thread L 0.553",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 0.18 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "1",
     "—",
     "A 0.813",
     "C 0.500",
     "B 0.750; thread L 0.661",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 0.35 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "1-1/4",
     "—",
     "A 0.940",
     "C 0.563",
     "B 0.813; thread L 0.681",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 0.6 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "1-1/2",
     "—",
     "A 1.125",
     "C 0.625",
     "B 0.813; thread L 0.681",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 0.82 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "2",
     "—",
     "A 1.313",
     "C 0.690",
     "B 0.880; thread L 0.697",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 1.36 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "2-1/2",
     "—",
     "A 1.500",
     "C 0.750",
     "B 1.063; thread L 0.933",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 2.21 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "3",
     "—",
     "A 1.690",
     "C 0.813",
     "B 1.125; thread L 1.016",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 3.47 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "3-1/2",
     "—",
     "A 1.875",
     "C 0.875",
     "B 1.187; thread L 1.071",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 4.73 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "4",
     "—",
     "A 2.500",
     "C 1.000",
     "B 1.250; thread L 1.094",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 8.64 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "5",
     "—",
     "A 3.250",
     "C 1.625",
     "B 1.875; thread L 1.187",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 17.12 lb"
    ],
    [
     "square head plug, Penn Machine (in)",
     "6",
     "—",
     "A 4.250",
     "C 1.875",
     "B 2.000; thread L 1.208",
     "—",
     "—",
     "—",
     "—",
     "letters as printed; weight (carbon steel) 28.41 lb"
    ],
    [
     "square head plug, ASME B16.11 (wermac, mm)",
     "1/2",
     "—",
     "B min 14",
     "C min 10",
     "E min length 14",
     "—",
     "—",
     "—",
     "—",
     "wermac letters: B across flats, C square height, E length"
    ],
    [
     "square head plug, ASME B16.11 (wermac, mm)",
     "3/4",
     "—",
     "B min 16",
     "C min 11",
     "E min length 16",
     "—",
     "—",
     "—",
     "—",
     "wermac letters: B across flats, C square height, E length"
    ],
    [
     "square head plug, ASME B16.11 (wermac, mm)",
     "1",
     "—",
     "B min 21",
     "C min 13",
     "E min length 19",
     "—",
     "—",
     "—",
     "—",
     "wermac letters: B across flats, C square height, E length"
    ],
    [
     "square head plug, ASME B16.11 (wermac, mm)",
     "1-1/4",
     "—",
     "B min 24",
     "C min 14",
     "E min length 21",
     "—",
     "—",
     "—",
     "—",
     "wermac letters: B across flats, C square height, E length"
    ],
    [
     "square head plug, ASME B16.11 (wermac, mm)",
     "1-1/2",
     "—",
     "B min 28",
     "C min 16",
     "E min length 21",
     "—",
     "—",
     "—",
     "—",
     "wermac letters: B across flats, C square height, E length"
    ],
    [
     "square head plug, ASME B16.11 (wermac, mm)",
     "2",
     "—",
     "B min 32",
     "C min 18",
     "E min length 22",
     "—",
     "—",
     "—",
     "—",
     "wermac letters: B across flats, C square height, E length"
    ],
    [
     "square head plug, ASME B16.11 (wermac, mm)",
     "2-1/2",
     "—",
     "B min 36",
     "C min 19",
     "E min length 27",
     "—",
     "—",
     "—",
     "—",
     "wermac letters: B across flats, C square height, E length"
    ],
    [
     "square head plug, ASME B16.11 (wermac, mm)",
     "3",
     "—",
     "B min 41",
     "C min 21",
     "E min length 28",
     "—",
     "—",
     "—",
     "—",
     "wermac letters: B across flats, C square height, E length"
    ],
    [
     "square head plug, ASME B16.11 (wermac, mm)",
     "4",
     "—",
     "B min 65",
     "C min 25",
     "E min length 32",
     "—",
     "—",
     "—",
     "—",
     "wermac letters: B across flats, C square height, E length"
    ],
    [
     "hex head plug, ASME B16.11 (wermac, mm)",
     "1/2",
     "—",
     "F nominal 22",
     "J min 8",
     "E min length 14",
     "—",
     "—",
     "—",
     "—",
     "wermac letters; F read as the hex width"
    ],
    [
     "hex head plug, ASME B16.11 (wermac, mm)",
     "3/4",
     "—",
     "F nominal 27",
     "J min 10",
     "E min length 16",
     "—",
     "—",
     "—",
     "—",
     "wermac letters; F read as the hex width"
    ],
    [
     "hex head plug, ASME B16.11 (wermac, mm)",
     "1",
     "—",
     "F nominal 35",
     "J min 10",
     "E min length 19",
     "—",
     "—",
     "—",
     "—",
     "wermac letters; F read as the hex width"
    ],
    [
     "hex head plug, ASME B16.11 (wermac, mm)",
     "1-1/4",
     "—",
     "F nominal 44.5",
     "J min 14",
     "E min length 21",
     "—",
     "—",
     "—",
     "—",
     "wermac letters; F read as the hex width"
    ],
    [
     "hex head plug, ASME B16.11 (wermac, mm)",
     "1-1/2",
     "—",
     "F nominal 51",
     "J min 16",
     "E min length 21",
     "—",
     "—",
     "—",
     "—",
     "wermac letters; F read as the hex width"
    ],
    [
     "hex head plug, ASME B16.11 (wermac, mm)",
     "2",
     "—",
     "F nominal 63.5",
     "J min 18",
     "E min length 22",
     "—",
     "—",
     "—",
     "—",
     "wermac letters; F read as the hex width"
    ],
    [
     "hex head plug, ASME B16.11 (wermac, mm)",
     "2-1/2",
     "—",
     "F nominal 76",
     "J min 19",
     "E min length 27",
     "—",
     "—",
     "—",
     "—",
     "wermac letters; F read as the hex width"
    ],
    [
     "hex head plug, ASME B16.11 (wermac, mm)",
     "3",
     "—",
     "F nominal 89",
     "J min 21",
     "E min length 28",
     "—",
     "—",
     "—",
     "—",
     "wermac letters; F read as the hex width"
    ],
    [
     "hex head plug, ASME B16.11 (wermac, mm)",
     "4",
     "—",
     "F nominal 117.5",
     "J min 25",
     "E min length 32",
     "—",
     "—",
     "—",
     "—",
     "wermac letters; F read as the hex width"
    ],
    [
     "round head plug, ASME B16.11 (wermac, mm)",
     "1/2",
     "—",
     "D head dia 21",
     "—",
     "E min length 14; A min length 44",
     "—",
     "—",
     "—",
     "—",
     "wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo"
    ],
    [
     "round head plug, ASME B16.11 (wermac, mm)",
     "3/4",
     "—",
     "D head dia 27",
     "—",
     "E min length 16; A min length 44",
     "—",
     "—",
     "—",
     "—",
     "wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo"
    ],
    [
     "round head plug, ASME B16.11 (wermac, mm)",
     "1",
     "—",
     "D head dia 33",
     "—",
     "E min length 19; A min length 51",
     "—",
     "—",
     "—",
     "—",
     "wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo"
    ],
    [
     "round head plug, ASME B16.11 (wermac, mm)",
     "1-1/4",
     "—",
     "D head dia 43",
     "—",
     "E min length 21; A min length 51",
     "—",
     "—",
     "—",
     "—",
     "wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo"
    ],
    [
     "round head plug, ASME B16.11 (wermac, mm)",
     "1-1/2",
     "—",
     "D head dia 48",
     "—",
     "E min length 21; A min length 51",
     "—",
     "—",
     "—",
     "—",
     "wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo"
    ],
    [
     "round head plug, ASME B16.11 (wermac, mm)",
     "2",
     "—",
     "D head dia 60",
     "—",
     "E min length 22; A min length 64",
     "—",
     "—",
     "—",
     "—",
     "wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo"
    ],
    [
     "round head plug, ASME B16.11 (wermac, mm)",
     "2-1/2",
     "—",
     "D head dia 73",
     "—",
     "E min length 37; A min length 70",
     "—",
     "—",
     "—",
     "—",
     "wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo"
    ],
    [
     "round head plug, ASME B16.11 (wermac, mm)",
     "3",
     "—",
     "D head dia 89",
     "—",
     "E min length 28; A min length 70",
     "—",
     "—",
     "—",
     "—",
     "wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo"
    ],
    [
     "round head plug, ASME B16.11 (wermac, mm)",
     "4",
     "—",
     "D head dia 114",
     "—",
     "E min length 32; A min length 76",
     "—",
     "—",
     "—",
     "—",
     "wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo"
    ],
    [
     "hex socket plug, Dryseal NPTF (Alma, in)",
     "1/16",
     "27",
     "OD D 0.312",
     "J 5/32",
     "L 0.300 – 0.324",
     "T min 0.140",
     "G min 0.062",
     "150 in-lb",
     "15/64",
     "letters as printed by Alma (L, G not defined)"
    ],
    [
     "hex socket plug, Dryseal NPTF (Alma, in)",
     "1/8",
     "27",
     "OD D 0.405",
     "J 3/16",
     "L 0.300 – 0.324",
     "T min 0.140",
     "G min 0.062",
     "250 in-lb",
     "21/64",
     "letters as printed by Alma (L, G not defined)"
    ],
    [
     "hex socket plug, Dryseal NPTF (Alma, in)",
     "1/4",
     "18",
     "OD D 0.540",
     "J 1/4",
     "L 0.417 – 0.457",
     "T min 0.218",
     "G min 0.073",
     "600 in-lb",
     "27/64",
     "letters as printed by Alma (L, G not defined)"
    ],
    [
     "hex socket plug, Dryseal NPTF (Alma, in)",
     "3/8",
     "18",
     "OD D 0.675",
     "J 5/16",
     "L 0.480 – 0.520",
     "T min 0.250",
     "G min 0.084",
     "1200 in-lb",
     "7/16",
     "letters as printed by Alma (L, G not defined)"
    ],
    [
     "hex socket plug, Dryseal NPTF (Alma, in)",
     "1/2",
     "14",
     "OD D 0.840",
     "J 3/8",
     "L 0.542 – 0.582",
     "T min 0.312",
     "G min 0.095",
     "1800 in-lb",
     "9/16",
     "letters as printed by Alma (L, G not defined)"
    ],
    [
     "hex socket plug, Dryseal NPTF (Alma, in)",
     "3/4",
     "14",
     "OD D 1.050",
     "J 9/16",
     "L 0.605 – 0.645",
     "T min 0.312",
     "G min 0.125",
     "3000 in-lb",
     "57/64",
     "letters as printed by Alma (L, G not defined)"
    ],
    [
     "hex socket plug, Dryseal NPTF (Alma, in)",
     "1",
     "11-1/2",
     "OD D 1.315",
     "J 5/8",
     "L 0.730 – 0.770",
     "T min 0.375",
     "G min 0.125",
     "4200 in-lb",
     "1-1/8",
     "letters as printed by Alma (L, G not defined)"
    ],
    [
     "hex socket plug, Dryseal NPTF (Alma, in)",
     "1-1/4",
     "11-1/2",
     "OD D 1.660",
     "J 3/4",
     "L 0.792 – 0.832",
     "T min 0.437",
     "G min 0.156",
     "5400 in-lb",
     "37.5 mm",
     "letters as printed by Alma (L, G not defined)"
    ],
    [
     "hex socket plug, Dryseal NPTF (Alma, in)",
     "1-1/2",
     "11-1/2",
     "OD D 1.900",
     "J 1",
     "L 0.780 – 0.843",
     "T min 0.437",
     "G min 0.156",
     "6900 in-lb",
     "43.5 mm",
     "letters as printed by Alma (L, G not defined)"
    ],
    [
     "hex socket plug, Dryseal NPTF (Alma, in)",
     "2",
     "11-1/2",
     "OD D 2.375",
     "J 1",
     "L 0.844 – 0.906",
     "T min 0.437",
     "G min 0.156",
     "8500 in-lb",
     "2-3/16",
     "letters as printed by Alma (L, G not defined)"
    ],
    [
     "hex socket plug, flush PTF (Alma, American Fastener, in)",
     "1/16",
     "27",
     "OD D 0.307",
     "J 5/32",
     "L 0.235 – 0.250",
     "T min 0.140",
     "G min 0.052",
     "150 in-lb",
     "15/64",
     "same numbers on both sheets"
    ],
    [
     "hex socket plug, flush PTF (Alma, American Fastener, in)",
     "1/8",
     "27",
     "OD D 0.401",
     "J 3/16",
     "L 0.235 – 0.250",
     "T min 0.140",
     "G min 0.049",
     "250 in-lb",
     "21/64",
     "same numbers on both sheets"
    ],
    [
     "hex socket plug, flush PTF (Alma, American Fastener, in)",
     "1/4",
     "18",
     "OD D 0.529",
     "J 1/4",
     "L 0.391 – 0.406",
     "T min 0.218",
     "G min 0.045",
     "600 in-lb",
     "27/64",
     "same numbers on both sheets"
    ],
    [
     "hex socket plug, flush PTF (Alma, American Fastener, in)",
     "3/8",
     "18",
     "OD D 0.667",
     "J 5/16",
     "L 0.391 – 0.406",
     "T min 0.250",
     "G min 0.040",
     "1200 in-lb",
     "9/16",
     "same numbers on both sheets"
    ],
    [
     "hex socket plug, flush PTF (Alma, American Fastener, in)",
     "1/2",
     "14",
     "OD D 0.830",
     "J 3/8",
     "L 0.516 – 0.531",
     "T min 0.312",
     "G min 0.067",
     "1800 in-lb",
     "9/16",
     "same numbers on both sheets"
    ],
    [
     "hex socket plug, flush PTF (Alma, American Fastener, in)",
     "3/4",
     "14",
     "OD D 1.041",
     "J 9/16",
     "L 0.516 – 0.531",
     "T min 0.312",
     "G min 0.054",
     "3000 in-lb",
     "57/64",
     "same numbers on both sheets"
    ],
    [
     "hex socket plug, flush PTF (Alma, American Fastener, in)",
     "1",
     "11-1/2",
     "OD D 1.302",
     "J 5/8",
     "L 0.641 – 0.656",
     "T min 0.375",
     "G min 0.112",
     "4200 in-lb",
     "1-1/8",
     "same numbers on both sheets"
    ],
    [
     "hex socket plug, flush PTF (Alma, American Fastener, in)",
     "1-1/4",
     "11-1/2",
     "OD D 1.647",
     "J 3/4",
     "L 0.641 – 0.656",
     "T min 0.437",
     "G min 0.102",
     "5400 in-lb",
     "37.5 mm",
     "same numbers on both sheets"
    ]
   ]
  }
 },
 "sheet_text": "NPT pipe plugs: square head, hex head, round head and hex socket (ASME B16.11; Dryseal NPTF, flush PTF) 1/16 to 6 in — head size, length, socket + envelope models — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/pipe-plugs-npt-square-hex-socket/  (sheet CC BY 4.0)\nBasis: Penn Machine's forged square head plug catalog (inches), wermac.org's ASME B16.11 plug tables (mm), and Alma Bolt's and American Fastener's hex socket plug sheets (inches); 18 hex-socket plug envelopes as files\nCatalog version: 2026-10-20\n\nOverall (mm): length 7.9, width 7.9, height 8.2\n- Square head plugs (forged steel, ASME B16.11 family), Penn Machine, inches, 1/8 to 6: A, B, C and the thread length L, with weights. The text read does not define the letters. They were matched to wermac.org's mm table: Penn A tracks wermac's B (width across flats: 1/2 → 0.563 in = 14.3 mm against 14; 1 → 0.813 in = 20.6 mm against 21; 2 → 1.313 in = 33.3 mm against 32), Penn B tracks wermac's E (length: 3/4 → 0.625 in = 15.9 against 16; 2 → 0.880 in = 22.4 against 22) and Penn C tracks wermac's C (square height: 1/2 → 0.380 in = 9.7 mm against 10). That matching is the Xem reading, not a statement of either source. At 4 in Penn's A is 2.500 in (63.5 mm) against wermac's 65 mm. The mm tables are minimum values (wermac: 'min'), so small differences are expected.\n- wermac.org tables are third-party transcriptions of ASME B16.11 plugs, mm, NPS 1/2 to 4, with the page's own letters; there is no hex-socket table on that page (hex-socket plugs are not an ASME B16.11 product in the sources read). In the round head table the 2-1/2 length E is 37 where hex and square give 27; probably a typo, shown as printed. A hex-head table from a cast stainless catalog (150# CSS) was read but its columns could not be assigned, so it is not used.\n- Hex socket plugs: Alma Bolt prints two series with the same columns, Dryseal NPTF (1/16 to 2) and flush PTF (1/16 to 1-1/4): OD D, threads per inch, hex socket J (across flats), key engagement T (min), wall G (min), overall length L (max / min), tightening torque, tap drill. American Fastener's flush-seal sheet has the same numbers as Alma's PTF rows. Alma does not define L or G; American Fastener's headers are compressed, so L as overall length and G as wall thickness follow the order of its columns. Alma heads the NPTF table 'tapered 3/4 in diameter per foot' and the flush PTF table 'tapered 7/8 in diameter per foot'. See npt-thread-dimensions-asme-b1-20-1 for the thread numbers.\n- Files: straight cylinders at the OD D with the L max overall length and a flat-bottomed hex socket of J across flats and T min depth, 10 Dryseal NPTF sizes and 8 flush PTF sizes. The real thread is tapered; here the printed OD D is carried as a plain cylinder at that diameter (taper not drawn). Square-head and hex-head plugs have no file: their head edges, chamfers and thread dimensions are not given as numbers that define the shape. Countersunk hex head plugs are not tabulated (no source read).\n- McMaster-Carr sells pipe plugs (square, hex head, socket, SAE J531 etc.) with per-part STEP; its SAE J531 and steel socket plug categories are linked, not copied.\n\ntable (source)  NPS  TPI  across flats / OD  head height  length / thread length  key engagement T  wall G  torque  tap drill  note\nsquare head plug, Penn Machine (in)  1/8  —  A 0.281  C 0.250  B 0.380; thread L 0.273  —  —  —  —  letters as printed; weight (carbon steel) 0.02 lb\nsquare head plug, Penn Machine (in)  1/4  —  A 0.380  C 0.250  B 0.440; thread L 0.395  —  —  —  —  letters as printed; weight (carbon steel) 0.03 lb\nsquare head plug, Penn Machine (in)  3/8  —  A 0.440  C 0.313  B 0.500; thread L 0.407  —  —  —  —  letters as printed; weight (carbon steel) 0.06 lb\nsquare head plug, Penn Machine (in)  1/2  —  A 0.563  C 0.380  B 0.563; thread L 0.534  —  —  —  —  letters as printed; weight (carbon steel) 0.11 lb\nsquare head plug, Penn Machine (in)  3/4  —  A 0.625  C 0.440  B 0.625; thread L 0.553  —  —  —  —  letters as printed; weight (carbon steel) 0.18 lb\nsquare head plug, Penn Machine (in)  1  —  A 0.813  C 0.500  B 0.750; thread L 0.661  —  —  —  —  letters as printed; weight (carbon steel) 0.35 lb\nsquare head plug, Penn Machine (in)  1-1/4  —  A 0.940  C 0.563  B 0.813; thread L 0.681  —  —  —  —  letters as printed; weight (carbon steel) 0.6 lb\nsquare head plug, Penn Machine (in)  1-1/2  —  A 1.125  C 0.625  B 0.813; thread L 0.681  —  —  —  —  letters as printed; weight (carbon steel) 0.82 lb\nsquare head plug, Penn Machine (in)  2  —  A 1.313  C 0.690  B 0.880; thread L 0.697  —  —  —  —  letters as printed; weight (carbon steel) 1.36 lb\nsquare head plug, Penn Machine (in)  2-1/2  —  A 1.500  C 0.750  B 1.063; thread L 0.933  —  —  —  —  letters as printed; weight (carbon steel) 2.21 lb\nsquare head plug, Penn Machine (in)  3  —  A 1.690  C 0.813  B 1.125; thread L 1.016  —  —  —  —  letters as printed; weight (carbon steel) 3.47 lb\nsquare head plug, Penn Machine (in)  3-1/2  —  A 1.875  C 0.875  B 1.187; thread L 1.071  —  —  —  —  letters as printed; weight (carbon steel) 4.73 lb\nsquare head plug, Penn Machine (in)  4  —  A 2.500  C 1.000  B 1.250; thread L 1.094  —  —  —  —  letters as printed; weight (carbon steel) 8.64 lb\nsquare head plug, Penn Machine (in)  5  —  A 3.250  C 1.625  B 1.875; thread L 1.187  —  —  —  —  letters as printed; weight (carbon steel) 17.12 lb\nsquare head plug, Penn Machine (in)  6  —  A 4.250  C 1.875  B 2.000; thread L 1.208  —  —  —  —  letters as printed; weight (carbon steel) 28.41 lb\nsquare head plug, ASME B16.11 (wermac, mm)  1/2  —  B min 14  C min 10  E min length 14  —  —  —  —  wermac letters: B across flats, C square height, E length\nsquare head plug, ASME B16.11 (wermac, mm)  3/4  —  B min 16  C min 11  E min length 16  —  —  —  —  wermac letters: B across flats, C square height, E length\nsquare head plug, ASME B16.11 (wermac, mm)  1  —  B min 21  C min 13  E min length 19  —  —  —  —  wermac letters: B across flats, C square height, E length\nsquare head plug, ASME B16.11 (wermac, mm)  1-1/4  —  B min 24  C min 14  E min length 21  —  —  —  —  wermac letters: B across flats, C square height, E length\nsquare head plug, ASME B16.11 (wermac, mm)  1-1/2  —  B min 28  C min 16  E min length 21  —  —  —  —  wermac letters: B across flats, C square height, E length\nsquare head plug, ASME B16.11 (wermac, mm)  2  —  B min 32  C min 18  E min length 22  —  —  —  —  wermac letters: B across flats, C square height, E length\nsquare head plug, ASME B16.11 (wermac, mm)  2-1/2  —  B min 36  C min 19  E min length 27  —  —  —  —  wermac letters: B across flats, C square height, E length\nsquare head plug, ASME B16.11 (wermac, mm)  3  —  B min 41  C min 21  E min length 28  —  —  —  —  wermac letters: B across flats, C square height, E length\nsquare head plug, ASME B16.11 (wermac, mm)  4  —  B min 65  C min 25  E min length 32  —  —  —  —  wermac letters: B across flats, C square height, E length\nhex head plug, ASME B16.11 (wermac, mm)  1/2  —  F nominal 22  J min 8  E min length 14  —  —  —  —  wermac letters; F read as the hex width\nhex head plug, ASME B16.11 (wermac, mm)  3/4  —  F nominal 27  J min 10  E min length 16  —  —  —  —  wermac letters; F read as the hex width\nhex head plug, ASME B16.11 (wermac, mm)  1  —  F nominal 35  J min 10  E min length 19  —  —  —  —  wermac letters; F read as the hex width\nhex head plug, ASME B16.11 (wermac, mm)  1-1/4  —  F nominal 44.5  J min 14  E min length 21  —  —  —  —  wermac letters; F read as the hex width\nhex head plug, ASME B16.11 (wermac, mm)  1-1/2  —  F nominal 51  J min 16  E min length 21  —  —  —  —  wermac letters; F read as the hex width\nhex head plug, ASME B16.11 (wermac, mm)  2  —  F nominal 63.5  J min 18  E min length 22  —  —  —  —  wermac letters; F read as the hex width\nhex head plug, ASME B16.11 (wermac, mm)  2-1/2  —  F nominal 76  J min 19  E min length 27  —  —  —  —  wermac letters; F read as the hex width\nhex head plug, ASME B16.11 (wermac, mm)  3  —  F nominal 89  J min 21  E min length 28  —  —  —  —  wermac letters; F read as the hex width\nhex head plug, ASME B16.11 (wermac, mm)  4  —  F nominal 117.5  J min 25  E min length 32  —  —  —  —  wermac letters; F read as the hex width\nround head plug, ASME B16.11 (wermac, mm)  1/2  —  D head dia 21  —  E min length 14; A min length 44  —  —  —  —  wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo\nround head plug, ASME B16.11 (wermac, mm)  3/4  —  D head dia 27  —  E min length 16; A min length 44  —  —  —  —  wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo\nround head plug, ASME B16.11 (wermac, mm)  1  —  D head dia 33  —  E min length 19; A min length 51  —  —  —  —  wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo\nround head plug, ASME B16.11 (wermac, mm)  1-1/4  —  D head dia 43  —  E min length 21; A min length 51  —  —  —  —  wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo\nround head plug, ASME B16.11 (wermac, mm)  1-1/2  —  D head dia 48  —  E min length 21; A min length 51  —  —  —  —  wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo\nround head plug, ASME B16.11 (wermac, mm)  2  —  D head dia 60  —  E min length 22; A min length 64  —  —  —  —  wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo\nround head plug, ASME B16.11 (wermac, mm)  2-1/2  —  D head dia 73  —  E min length 37; A min length 70  —  —  —  —  wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo\nround head plug, ASME B16.11 (wermac, mm)  3  —  D head dia 89  —  E min length 28; A min length 70  —  —  —  —  wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo\nround head plug, ASME B16.11 (wermac, mm)  4  —  D head dia 114  —  E min length 32; A min length 76  —  —  —  —  wermac prints E = 37 at 2-1/2, against 27 for hex / square: probably a typo\nhex socket plug, Dryseal NPTF (Alma, in)  1/16  27  OD D 0.312  J 5/32  L 0.300 – 0.324  T min 0.140  G min 0.062  150 in-lb  15/64  letters as printed by Alma (L, G not defined)\nhex socket plug, Dryseal NPTF (Alma, in)  1/8  27  OD D 0.405  J 3/16  L 0.300 – 0.324  T min 0.140  G min 0.062  250 in-lb  21/64  letters as printed by Alma (L, G not defined)\nhex socket plug, Dryseal NPTF (Alma, in)  1/4  18  OD D 0.540  J 1/4  L 0.417 – 0.457  T min 0.218  G min 0.073  600 in-lb  27/64  letters as printed by Alma (L, G not defined)\nhex socket plug, Dryseal NPTF (Alma, in)  3/8  18  OD D 0.675  J 5/16  L 0.480 – 0.520  T min 0.250  G min 0.084  1200 in-lb  7/16  letters as printed by Alma (L, G not defined)\nhex socket plug, Dryseal NPTF (Alma, in)  1/2  14  OD D 0.840  J 3/8  L 0.542 – 0.582  T min 0.312  G min 0.095  1800 in-lb  9/16  letters as printed by Alma (L, G not defined)\nhex socket plug, Dryseal NPTF (Alma, in)  3/4  14  OD D 1.050  J 9/16  L 0.605 – 0.645  T min 0.312  G min 0.125  3000 in-lb  57/64  letters as printed by Alma (L, G not defined)\nhex socket plug, Dryseal NPTF (Alma, in)  1  11-1/2  OD D 1.315  J 5/8  L 0.730 – 0.770  T min 0.375  G min 0.125  4200 in-lb  1-1/8  letters as printed by Alma (L, G not defined)\nhex socket plug, Dryseal NPTF (Alma, in)  1-1/4  11-1/2  OD D 1.660  J 3/4  L 0.792 – 0.832  T min 0.437  G min 0.156  5400 in-lb  37.5 mm  letters as printed by Alma (L, G not defined)\nhex socket plug, Dryseal NPTF (Alma, in)  1-1/2  11-1/2  OD D 1.900  J 1  L 0.780 – 0.843  T min 0.437  G min 0.156  6900 in-lb  43.5 mm  letters as printed by Alma (L, G not defined)\nhex socket plug, Dryseal NPTF (Alma, in)  2  11-1/2  OD D 2.375  J 1  L 0.844 – 0.906  T min 0.437  G min 0.156  8500 in-lb  2-3/16  letters as printed by Alma (L, G not defined)\nhex socket plug, flush PTF (Alma, American Fastener, in)  1/16  27  OD D 0.307  J 5/32  L 0.235 – 0.250  T min 0.140  G min 0.052  150 in-lb  15/64  same numbers on both sheets\nhex socket plug, flush PTF (Alma, American Fastener, in)  1/8  27  OD D 0.401  J 3/16  L 0.235 – 0.250  T min 0.140  G min 0.049  250 in-lb  21/64  same numbers on both sheets\nhex socket plug, flush PTF (Alma, American Fastener, in)  1/4  18  OD D 0.529  J 1/4  L 0.391 – 0.406  T min 0.218  G min 0.045  600 in-lb  27/64  same numbers on both sheets\nhex socket plug, flush PTF (Alma, American Fastener, in)  3/8  18  OD D 0.667  J 5/16  L 0.391 – 0.406  T min 0.250  G min 0.040  1200 in-lb  9/16  same numbers on both sheets\nhex socket plug, flush PTF (Alma, American Fastener, in)  1/2  14  OD D 0.830  J 3/8  L 0.516 – 0.531  T min 0.312  G min 0.067  1800 in-lb  9/16  same numbers on both sheets\nhex socket plug, flush PTF (Alma, American Fastener, in)  3/4  14  OD D 1.041  J 9/16  L 0.516 – 0.531  T min 0.312  G min 0.054  3000 in-lb  57/64  same numbers on both sheets\nhex socket plug, flush PTF (Alma, American Fastener, in)  1  11-1/2  OD D 1.302  J 5/8  L 0.641 – 0.656  T min 0.375  G min 0.112  4200 in-lb  1-1/8  same numbers on both sheets\nhex socket plug, flush PTF (Alma, American Fastener, in)  1-1/4  11-1/2  OD D 1.647  J 3/4  L 0.641 – 0.656  T min 0.437  G min 0.102  5400 in-lb  37.5 mm  same numbers on both sheets\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Pennsylvania Machine Works (Penn Machine): Forged steel square head plug: pipe size 1/8 to 6, dimensions A, B, C, weight and thread length L, inches — web — Maker catalog; numbers only. Letters A / B / C are not defined in the text read — https://www.cooneybrothers.com/userfiles/ad/documents/Pennsylvania_12203304_Catalog.pdf\n- wermac.org: Threaded plugs (ASME B16.11): hex head, square head and round head plug dimensions in mm, NPS 1/2 to 4 — web — Third-party reference; numbers only. No hex-socket table on the page — https://www.wermac.org/fittings/dim_thd_plugs.html\n- Alma Bolt: Hex socket pressure plugs: Dryseal NPTF (1/16 to 2) and flush PTF (1/16 to 1-1/4): D, TPI, J hex socket, T key engagement, G wall, L max / min, torque, tap drill — web — Distributor catalog; numbers only. The page does not define the L and G letters — https://www.almabolt.com/pages/catalog/alloysocket/hexpressureplugs.htm\n- American Fastener: Socket pipe plug, flush seal: nominal size, OD, TPI, hex socket size, key engagement, wall, overall length max / min, tightening torque, 1/16 to 1-1/4 — web — Maker data sheet; numbers only. No standard cited — https://www.americanfastener.com/wp-content/uploads/2020/06/SOCKETS-SOCKET-PIPE-PLUG-FLUSH-SEAL-AMERICAN-FASTENER.pdf\n- McMaster-Carr: SAE J531 pipe plugs (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/products/pipe-plugs/specifications-met~sae-j531/\n- McMaster-Carr: Steel socket pipe fitting plugs (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/products/socket-pipe-fitting-plugs/material~steel-2/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 18 parts): https://xemstudio.com/files/hardware/pipe-plugs-npt-square-hex-socket/index.json\nAPI: https://xemstudio.com/api/geometry?object=pipe-plugs-npt-square-hex-socket\n",
 "sources": [
  {
   "publisher": "Pennsylvania Machine Works (Penn Machine)",
   "title": "Forged steel square head plug: pipe size 1/8 to 6, dimensions A, B, C, weight and thread length L, inches",
   "url": "https://www.cooneybrothers.com/userfiles/ad/documents/Pennsylvania_12203304_Catalog.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker catalog; numbers only. Letters A / B / C are not defined in the text read",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "wermac.org",
   "title": "Threaded plugs (ASME B16.11): hex head, square head and round head plug dimensions in mm, NPS 1/2 to 4",
   "url": "https://www.wermac.org/fittings/dim_thd_plugs.html",
   "formats": [
    "web"
   ],
   "license": "Third-party reference; numbers only. No hex-socket table on the page",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Alma Bolt",
   "title": "Hex socket pressure plugs: Dryseal NPTF (1/16 to 2) and flush PTF (1/16 to 1-1/4): D, TPI, J hex socket, T key engagement, G wall, L max / min, torque, tap drill",
   "url": "https://www.almabolt.com/pages/catalog/alloysocket/hexpressureplugs.htm",
   "formats": [
    "web"
   ],
   "license": "Distributor catalog; numbers only. The page does not define the L and G letters",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "American Fastener",
   "title": "Socket pipe plug, flush seal: nominal size, OD, TPI, hex socket size, key engagement, wall, overall length max / min, tightening torque, 1/16 to 1-1/4",
   "url": "https://www.americanfastener.com/wp-content/uploads/2020/06/SOCKETS-SOCKET-PIPE-PLUG-FLUSH-SEAL-AMERICAN-FASTENER.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker data sheet; numbers only. No standard cited",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "SAE J531 pipe plugs (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/pipe-plugs/specifications-met~sae-j531/",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Steel socket pipe fitting plugs (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/socket-pipe-fitting-plugs/material~steel-2/",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "npt-thread-dimensions-asme-b1-20-1",
  "npt-thread-envelopes",
  "forged-threaded-fittings-b16-11",
  "forged-socket-weld-fittings-b16-11",
  "malleable-iron-fittings-class-150",
  "hex-keys-iso-2936-asme-b18-3",
  "schedule-40-pipe",
  "tri-clamp-male-npt-adapters"
 ],
 "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": "hex socket",
   "exact": "J across flats: 1/16 5/32, 1/8 3/16, 1/4 1/4, 3/8 5/16, 1/2 3/8, 3/4 9/16, 1 5/8, 1-1/4 3/4, 1-1/2 and 2 in 1 in; depth T min 0.140 to 0.437 in",
   "mates": "hex key (Allen key) of the same size",
   "fit": "socket",
   "files": "hex-socket-plug-"
  },
  {
   "feature": "thread (tapered; OD as plain cylinder)",
   "exact": "OD D: Dryseal NPTF 1/16 0.312 … 2 in 2.375 in; flush PTF 1/16 0.307 … 1-1/4 1.647 in",
   "mates": "tapped hole: tap drill per Alma 1/16 15/64, 1/8 21/64, 1/4 27/64, 3/8 7/16 (Dryseal) or 9/16 (flush), 1/2 9/16, 3/4 57/64, 1 1-1/8 in",
   "fit": "designed",
   "files": "hex-socket-plug-"
  }
 ],
 "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 Allen key fits a 1/4 NPT socket plug?",
   "a": "1/4 in across flats (J), key engagement 0.218 in min, in both Alma's Dryseal and flush-PTF tables; 1/8 NPT takes a 3/16 in key and 3/8 NPT a 5/16 in key."
  },
  {
   "q": "What is the tap drill for a 1/8 NPT plug?",
   "a": "21/64 in in Alma's tables for both the Dryseal and flush series; the OD of the plug is 0.405 in (Dryseal) or 0.401 in (flush)."
  },
  {
   "q": "How big is a 1/2 NPT square head plug?",
   "a": "About 9/16 in (0.563) across flats and 0.380 in high in Penn's catalog, 14 mm across flats and 10 mm high in wermac's B16.11 table, 0.534 in of thread (Penn L)."
  }
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