{
 "meta": {
  "dataset": "pipe",
  "description": "ASME B36.10M pipe dimensions, one row per NPS × schedule, with NPT.",
  "schema_version": "1",
  "generated": "2026-08-12",
  "records": 39,
  "license": "CC BY 4.0 — attribution: BenchReference (benchreference.com)",
  "sources": [
   "asme-b36-10",
   "asme-b1-20-1",
   "npt-chart"
  ],
  "provenance": "https://benchreference.com/sources/"
 },
 "entries": [
  {
   "nps": "1/8",
   "od_inches": 0.405,
   "od_mm": 10.287,
   "schedule": "40/STD",
   "wall_inches": 0.068,
   "id_inches": 0.269,
   "npt_tpi": 27,
   "npt_tap_drill": "R"
  },
  {
   "nps": "1/8",
   "od_inches": 0.405,
   "od_mm": 10.287,
   "schedule": "80/XS",
   "wall_inches": 0.095,
   "id_inches": 0.21500000000000002,
   "npt_tpi": 27,
   "npt_tap_drill": "R"
  },
  {
   "nps": "1/4",
   "od_inches": 0.54,
   "od_mm": 13.716,
   "schedule": "40/STD",
   "wall_inches": 0.088,
   "id_inches": 0.36400000000000005,
   "npt_tpi": 18,
   "npt_tap_drill": "7/16″"
  },
  {
   "nps": "1/4",
   "od_inches": 0.54,
   "od_mm": 13.716,
   "schedule": "80/XS",
   "wall_inches": 0.119,
   "id_inches": 0.30200000000000005,
   "npt_tpi": 18,
   "npt_tap_drill": "7/16″"
  },
  {
   "nps": "3/8",
   "od_inches": 0.675,
   "od_mm": 17.145,
   "schedule": "40/STD",
   "wall_inches": 0.091,
   "id_inches": 0.49300000000000005,
   "npt_tpi": 18,
   "npt_tap_drill": "37/64″"
  },
  {
   "nps": "3/8",
   "od_inches": 0.675,
   "od_mm": 17.145,
   "schedule": "80/XS",
   "wall_inches": 0.126,
   "id_inches": 0.42300000000000004,
   "npt_tpi": 18,
   "npt_tap_drill": "37/64″"
  },
  {
   "nps": "1/2",
   "od_inches": 0.84,
   "od_mm": 21.336,
   "schedule": "40/STD",
   "wall_inches": 0.109,
   "id_inches": 0.622,
   "npt_tpi": 14,
   "npt_tap_drill": "23/32″"
  },
  {
   "nps": "1/2",
   "od_inches": 0.84,
   "od_mm": 21.336,
   "schedule": "80/XS",
   "wall_inches": 0.147,
   "id_inches": 0.546,
   "npt_tpi": 14,
   "npt_tap_drill": "23/32″"
  },
  {
   "nps": "3/4",
   "od_inches": 1.05,
   "od_mm": 26.669999999999998,
   "schedule": "40/STD",
   "wall_inches": 0.113,
   "id_inches": 0.8240000000000001,
   "npt_tpi": 14,
   "npt_tap_drill": "59/64″"
  },
  {
   "nps": "3/4",
   "od_inches": 1.05,
   "od_mm": 26.669999999999998,
   "schedule": "80/XS",
   "wall_inches": 0.154,
   "id_inches": 0.742,
   "npt_tpi": 14,
   "npt_tap_drill": "59/64″"
  },
  {
   "nps": "1",
   "od_inches": 1.315,
   "od_mm": 33.400999999999996,
   "schedule": "40/STD",
   "wall_inches": 0.133,
   "id_inches": 1.049,
   "npt_tpi": 11.5,
   "npt_tap_drill": "1-5/32″"
  },
  {
   "nps": "1",
   "od_inches": 1.315,
   "od_mm": 33.400999999999996,
   "schedule": "80/XS",
   "wall_inches": 0.179,
   "id_inches": 0.957,
   "npt_tpi": 11.5,
   "npt_tap_drill": "1-5/32″"
  },
  {
   "nps": "1-1/4",
   "od_inches": 1.66,
   "od_mm": 42.163999999999994,
   "schedule": "40/STD",
   "wall_inches": 0.14,
   "id_inches": 1.38,
   "npt_tpi": 11.5,
   "npt_tap_drill": "1-1/2″"
  },
  {
   "nps": "1-1/4",
   "od_inches": 1.66,
   "od_mm": 42.163999999999994,
   "schedule": "80/XS",
   "wall_inches": 0.191,
   "id_inches": 1.278,
   "npt_tpi": 11.5,
   "npt_tap_drill": "1-1/2″"
  },
  {
   "nps": "1-1/2",
   "od_inches": 1.9,
   "od_mm": 48.26,
   "schedule": "40/STD",
   "wall_inches": 0.145,
   "id_inches": 1.6099999999999999,
   "npt_tpi": 11.5,
   "npt_tap_drill": "1-47/64″"
  },
  {
   "nps": "1-1/2",
   "od_inches": 1.9,
   "od_mm": 48.26,
   "schedule": "80/XS",
   "wall_inches": 0.2,
   "id_inches": 1.5,
   "npt_tpi": 11.5,
   "npt_tap_drill": "1-47/64″"
  },
  {
   "nps": "2",
   "od_inches": 2.375,
   "od_mm": 60.324999999999996,
   "schedule": "40/STD",
   "wall_inches": 0.154,
   "id_inches": 2.067,
   "npt_tpi": 11.5,
   "npt_tap_drill": "2-7/32″"
  },
  {
   "nps": "2",
   "od_inches": 2.375,
   "od_mm": 60.324999999999996,
   "schedule": "80/XS",
   "wall_inches": 0.218,
   "id_inches": 1.939,
   "npt_tpi": 11.5,
   "npt_tap_drill": "2-7/32″"
  },
  {
   "nps": "2-1/2",
   "od_inches": 2.875,
   "od_mm": 73.02499999999999,
   "schedule": "40/STD",
   "wall_inches": 0.203,
   "id_inches": 2.469,
   "npt_tpi": 8,
   "npt_tap_drill": "2-5/8″"
  },
  {
   "nps": "2-1/2",
   "od_inches": 2.875,
   "od_mm": 73.02499999999999,
   "schedule": "80/XS",
   "wall_inches": 0.276,
   "id_inches": 2.323,
   "npt_tpi": 8,
   "npt_tap_drill": "2-5/8″"
  },
  {
   "nps": "3",
   "od_inches": 3.5,
   "od_mm": 88.89999999999999,
   "schedule": "40/STD",
   "wall_inches": 0.216,
   "id_inches": 3.068,
   "npt_tpi": 8,
   "npt_tap_drill": "3-1/4″"
  },
  {
   "nps": "3",
   "od_inches": 3.5,
   "od_mm": 88.89999999999999,
   "schedule": "80/XS",
   "wall_inches": 0.3,
   "id_inches": 2.9,
   "npt_tpi": 8,
   "npt_tap_drill": "3-1/4″"
  },
  {
   "nps": "3-1/2",
   "od_inches": 4,
   "od_mm": 101.6,
   "schedule": "40/STD",
   "wall_inches": 0.226,
   "id_inches": 3.548,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "3-1/2",
   "od_inches": 4,
   "od_mm": 101.6,
   "schedule": "80/XS",
   "wall_inches": 0.318,
   "id_inches": 3.364,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "4",
   "od_inches": 4.5,
   "od_mm": 114.3,
   "schedule": "40/STD",
   "wall_inches": 0.237,
   "id_inches": 4.026,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "4",
   "od_inches": 4.5,
   "od_mm": 114.3,
   "schedule": "80/XS",
   "wall_inches": 0.337,
   "id_inches": 3.826,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "5",
   "od_inches": 5.563,
   "od_mm": 141.3002,
   "schedule": "40/STD",
   "wall_inches": 0.258,
   "id_inches": 5.047,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "5",
   "od_inches": 5.563,
   "od_mm": 141.3002,
   "schedule": "80/XS",
   "wall_inches": 0.375,
   "id_inches": 4.813,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "6",
   "od_inches": 6.625,
   "od_mm": 168.27499999999998,
   "schedule": "40/STD",
   "wall_inches": 0.28,
   "id_inches": 6.0649999999999995,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "6",
   "od_inches": 6.625,
   "od_mm": 168.27499999999998,
   "schedule": "80/XS",
   "wall_inches": 0.432,
   "id_inches": 5.761,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "8",
   "od_inches": 8.625,
   "od_mm": 219.075,
   "schedule": "40/STD",
   "wall_inches": 0.322,
   "id_inches": 7.981,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "8",
   "od_inches": 8.625,
   "od_mm": 219.075,
   "schedule": "80/XS",
   "wall_inches": 0.5,
   "id_inches": 7.625,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "10",
   "od_inches": 10.75,
   "od_mm": 273.05,
   "schedule": "40/STD",
   "wall_inches": 0.365,
   "id_inches": 10.02,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "10",
   "od_inches": 10.75,
   "od_mm": 273.05,
   "schedule": "XS",
   "wall_inches": 0.5,
   "id_inches": 9.75,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "10",
   "od_inches": 10.75,
   "od_mm": 273.05,
   "schedule": "80",
   "wall_inches": 0.594,
   "id_inches": 9.562,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "12",
   "od_inches": 12.75,
   "od_mm": 323.84999999999997,
   "schedule": "STD",
   "wall_inches": 0.375,
   "id_inches": 12,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "12",
   "od_inches": 12.75,
   "od_mm": 323.84999999999997,
   "schedule": "40",
   "wall_inches": 0.406,
   "id_inches": 11.938,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "12",
   "od_inches": 12.75,
   "od_mm": 323.84999999999997,
   "schedule": "XS",
   "wall_inches": 0.5,
   "id_inches": 11.75,
   "npt_tpi": null,
   "npt_tap_drill": null
  },
  {
   "nps": "12",
   "od_inches": 12.75,
   "od_mm": 323.84999999999997,
   "schedule": "80",
   "wall_inches": 0.688,
   "id_inches": 11.374,
   "npt_tpi": null,
   "npt_tap_drill": null
  }
 ]
}