{
 "meta": {
  "title": "Tap Drill Size Chart",
  "generated": "computed from formulas, not copied from any published table",
  "formula_imperial": "drill = D - 0.0130 x %thread x (1/TPI)",
  "formula_metric": "drill = D - (%thread / 76.8) x pitch",
  "thread_standards": [
   "ASME B1.1 (Unified inch screw threads)",
   "ISO 261 / ISO 965 (Metric)"
  ],
  "drill_set": "ANSI fractional + number + letter + metric (public fact)",
  "note": "Tap drills selected as nearest size >= theoretical, since undersize risks tap breakage",
  "rows": 79
 },
 "columns": [
  "thread",
  "series",
  "tpi_or_pitch",
  "major_dia_in",
  "theoretical_drill_in",
  "tap_drill",
  "drill_dia_in",
  "actual_engagement_pct",
  "far_from_nominal",
  "clearance_drill"
 ],
 "rows": [
  {
   "thread": "#1-64",
   "series": "UNC",
   "tpi_or_pitch": 64,
   "major_dia_in": 0.073,
   "theoretical_drill_in": 0.0578,
   "tap_drill": "#53",
   "drill_dia_in": 0.0595,
   "actual_engagement_pct": 66.5,
   "far_from_nominal": "yes",
   "clearance_drill": "#37"
  },
  {
   "thread": "#2-56",
   "series": "UNC",
   "tpi_or_pitch": 56,
   "major_dia_in": 0.086,
   "theoretical_drill_in": 0.0686,
   "tap_drill": "#50",
   "drill_dia_in": 0.07,
   "actual_engagement_pct": 68.9,
   "far_from_nominal": "",
   "clearance_drill": "#32"
  },
  {
   "thread": "#3-48",
   "series": "UNC",
   "tpi_or_pitch": 48,
   "major_dia_in": 0.099,
   "theoretical_drill_in": 0.0787,
   "tap_drill": "#47",
   "drill_dia_in": 0.0785,
   "actual_engagement_pct": 75.7,
   "far_from_nominal": "",
   "clearance_drill": "#30"
  },
  {
   "thread": "#4-40",
   "series": "UNC",
   "tpi_or_pitch": 40,
   "major_dia_in": 0.112,
   "theoretical_drill_in": 0.0876,
   "tap_drill": "#43",
   "drill_dia_in": 0.089,
   "actual_engagement_pct": 70.8,
   "far_from_nominal": "",
   "clearance_drill": "#27"
  },
  {
   "thread": "#5-40",
   "series": "UNC",
   "tpi_or_pitch": 40,
   "major_dia_in": 0.125,
   "theoretical_drill_in": 0.1006,
   "tap_drill": "#38",
   "drill_dia_in": 0.1015,
   "actual_engagement_pct": 72.3,
   "far_from_nominal": "",
   "clearance_drill": "5/32\""
  },
  {
   "thread": "#6-32",
   "series": "UNC",
   "tpi_or_pitch": 32,
   "major_dia_in": 0.138,
   "theoretical_drill_in": 0.1075,
   "tap_drill": "#36",
   "drill_dia_in": 0.1065,
   "actual_engagement_pct": 77.5,
   "far_from_nominal": "",
   "clearance_drill": "#18"
  },
  {
   "thread": "#8-32",
   "series": "UNC",
   "tpi_or_pitch": 32,
   "major_dia_in": 0.164,
   "theoretical_drill_in": 0.1335,
   "tap_drill": "#29",
   "drill_dia_in": 0.136,
   "actual_engagement_pct": 68.9,
   "far_from_nominal": "",
   "clearance_drill": "#9"
  },
  {
   "thread": "#10-24",
   "series": "UNC",
   "tpi_or_pitch": 24,
   "major_dia_in": 0.19,
   "theoretical_drill_in": 0.1494,
   "tap_drill": "#25",
   "drill_dia_in": 0.1495,
   "actual_engagement_pct": 74.8,
   "far_from_nominal": "",
   "clearance_drill": "#2"
  },
  {
   "thread": "#12-24",
   "series": "UNC",
   "tpi_or_pitch": 24,
   "major_dia_in": 0.216,
   "theoretical_drill_in": 0.1754,
   "tap_drill": "#16",
   "drill_dia_in": 0.177,
   "actual_engagement_pct": 72.0,
   "far_from_nominal": "",
   "clearance_drill": "D"
  },
  {
   "thread": "1/4-20",
   "series": "UNC",
   "tpi_or_pitch": 20,
   "major_dia_in": 0.25,
   "theoretical_drill_in": 0.2012,
   "tap_drill": "#7",
   "drill_dia_in": 0.201,
   "actual_engagement_pct": 75.4,
   "far_from_nominal": "",
   "clearance_drill": "K"
  },
  {
   "thread": "5/16-18",
   "series": "UNC",
   "tpi_or_pitch": 18,
   "major_dia_in": 0.3125,
   "theoretical_drill_in": 0.2583,
   "tap_drill": "F",
   "drill_dia_in": 0.257,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "11/32\""
  },
  {
   "thread": "3/8-16",
   "series": "UNC",
   "tpi_or_pitch": 16,
   "major_dia_in": 0.375,
   "theoretical_drill_in": 0.3141,
   "tap_drill": "5/16\"",
   "drill_dia_in": 0.3125,
   "actual_engagement_pct": 76.9,
   "far_from_nominal": "",
   "clearance_drill": "13/32\""
  },
  {
   "thread": "7/16-14",
   "series": "UNC",
   "tpi_or_pitch": 14,
   "major_dia_in": 0.4375,
   "theoretical_drill_in": 0.3679,
   "tap_drill": "U",
   "drill_dia_in": 0.368,
   "actual_engagement_pct": 74.8,
   "far_from_nominal": "",
   "clearance_drill": "15/32\""
  },
  {
   "thread": "1/2-13",
   "series": "UNC",
   "tpi_or_pitch": 13,
   "major_dia_in": 0.5,
   "theoretical_drill_in": 0.425,
   "tap_drill": "27/64\"",
   "drill_dia_in": 0.4219,
   "actual_engagement_pct": 78.1,
   "far_from_nominal": "",
   "clearance_drill": "17/32\""
  },
  {
   "thread": "9/16-12",
   "series": "UNC",
   "tpi_or_pitch": 12,
   "major_dia_in": 0.5625,
   "theoretical_drill_in": 0.4813,
   "tap_drill": "31/64\"",
   "drill_dia_in": 0.4844,
   "actual_engagement_pct": 72.1,
   "far_from_nominal": "",
   "clearance_drill": "19/32\""
  },
  {
   "thread": "5/8-11",
   "series": "UNC",
   "tpi_or_pitch": 11,
   "major_dia_in": 0.625,
   "theoretical_drill_in": 0.5364,
   "tap_drill": "17/32\"",
   "drill_dia_in": 0.5312,
   "actual_engagement_pct": 79.4,
   "far_from_nominal": "",
   "clearance_drill": "21/32\""
  },
  {
   "thread": "3/4-10",
   "series": "UNC",
   "tpi_or_pitch": 10,
   "major_dia_in": 0.75,
   "theoretical_drill_in": 0.6525,
   "tap_drill": "21/32\"",
   "drill_dia_in": 0.6562,
   "actual_engagement_pct": 72.2,
   "far_from_nominal": "",
   "clearance_drill": "25/32\""
  },
  {
   "thread": "7/8-9",
   "series": "UNC",
   "tpi_or_pitch": 9,
   "major_dia_in": 0.875,
   "theoretical_drill_in": 0.7667,
   "tap_drill": "49/64\"",
   "drill_dia_in": 0.7656,
   "actual_engagement_pct": 75.7,
   "far_from_nominal": "",
   "clearance_drill": "29/32\""
  },
  {
   "thread": "1-8",
   "series": "UNC",
   "tpi_or_pitch": 8,
   "major_dia_in": 1.0,
   "theoretical_drill_in": 0.8781,
   "tap_drill": "7/8\"",
   "drill_dia_in": 0.875,
   "actual_engagement_pct": 76.9,
   "far_from_nominal": "",
   "clearance_drill": "1-1/32\""
  },
  {
   "thread": "1-1/8-7",
   "series": "UNC",
   "tpi_or_pitch": 7,
   "major_dia_in": 1.125,
   "theoretical_drill_in": 0.9857,
   "tap_drill": "63/64\"",
   "drill_dia_in": 0.9844,
   "actual_engagement_pct": 75.7,
   "far_from_nominal": "",
   "clearance_drill": "1-5/32\""
  },
  {
   "thread": "1-1/4-7",
   "series": "UNC",
   "tpi_or_pitch": 7,
   "major_dia_in": 1.25,
   "theoretical_drill_in": 1.1107,
   "tap_drill": "1-7/64\"",
   "drill_dia_in": 1.1094,
   "actual_engagement_pct": 75.7,
   "far_from_nominal": "",
   "clearance_drill": "1-9/32\""
  },
  {
   "thread": "1-3/8-6",
   "series": "UNC",
   "tpi_or_pitch": 6,
   "major_dia_in": 1.375,
   "theoretical_drill_in": 1.2125,
   "tap_drill": "1-7/32\"",
   "drill_dia_in": 1.2188,
   "actual_engagement_pct": 72.1,
   "far_from_nominal": "",
   "clearance_drill": "1-13/32\""
  },
  {
   "thread": "1-1/2-6",
   "series": "UNC",
   "tpi_or_pitch": 6,
   "major_dia_in": 1.5,
   "theoretical_drill_in": 1.3375,
   "tap_drill": "1-11/32\"",
   "drill_dia_in": 1.3438,
   "actual_engagement_pct": 72.1,
   "far_from_nominal": "",
   "clearance_drill": "1-17/32\""
  },
  {
   "thread": "#0-80",
   "series": "UNF",
   "tpi_or_pitch": 80,
   "major_dia_in": 0.06,
   "theoretical_drill_in": 0.0478,
   "tap_drill": "3/64\"",
   "drill_dia_in": 0.0469,
   "actual_engagement_pct": 80.6,
   "far_from_nominal": "",
   "clearance_drill": "#43"
  },
  {
   "thread": "#1-72",
   "series": "UNF",
   "tpi_or_pitch": 72,
   "major_dia_in": 0.073,
   "theoretical_drill_in": 0.0595,
   "tap_drill": "#53",
   "drill_dia_in": 0.0595,
   "actual_engagement_pct": 74.8,
   "far_from_nominal": "",
   "clearance_drill": "#37"
  },
  {
   "thread": "#2-64",
   "series": "UNF",
   "tpi_or_pitch": 64,
   "major_dia_in": 0.086,
   "theoretical_drill_in": 0.0708,
   "tap_drill": "#50",
   "drill_dia_in": 0.07,
   "actual_engagement_pct": 78.8,
   "far_from_nominal": "",
   "clearance_drill": "#32"
  },
  {
   "thread": "#3-56",
   "series": "UNF",
   "tpi_or_pitch": 56,
   "major_dia_in": 0.099,
   "theoretical_drill_in": 0.0816,
   "tap_drill": "#45",
   "drill_dia_in": 0.082,
   "actual_engagement_pct": 73.2,
   "far_from_nominal": "",
   "clearance_drill": "#30"
  },
  {
   "thread": "#4-48",
   "series": "UNF",
   "tpi_or_pitch": 48,
   "major_dia_in": 0.112,
   "theoretical_drill_in": 0.0917,
   "tap_drill": "#42",
   "drill_dia_in": 0.0935,
   "actual_engagement_pct": 68.3,
   "far_from_nominal": "",
   "clearance_drill": "#27"
  },
  {
   "thread": "#5-44",
   "series": "UNF",
   "tpi_or_pitch": 44,
   "major_dia_in": 0.125,
   "theoretical_drill_in": 0.1028,
   "tap_drill": "#37",
   "drill_dia_in": 0.104,
   "actual_engagement_pct": 71.1,
   "far_from_nominal": "",
   "clearance_drill": "5/32\""
  },
  {
   "thread": "#6-40",
   "series": "UNF",
   "tpi_or_pitch": 40,
   "major_dia_in": 0.138,
   "theoretical_drill_in": 0.1136,
   "tap_drill": "#33",
   "drill_dia_in": 0.113,
   "actual_engagement_pct": 76.9,
   "far_from_nominal": "",
   "clearance_drill": "#18"
  },
  {
   "thread": "#8-36",
   "series": "UNF",
   "tpi_or_pitch": 36,
   "major_dia_in": 0.164,
   "theoretical_drill_in": 0.1369,
   "tap_drill": "#29",
   "drill_dia_in": 0.136,
   "actual_engagement_pct": 77.5,
   "far_from_nominal": "",
   "clearance_drill": "#9"
  },
  {
   "thread": "#10-32",
   "series": "UNF",
   "tpi_or_pitch": 32,
   "major_dia_in": 0.19,
   "theoretical_drill_in": 0.1595,
   "tap_drill": "#21",
   "drill_dia_in": 0.159,
   "actual_engagement_pct": 76.3,
   "far_from_nominal": "",
   "clearance_drill": "#2"
  },
  {
   "thread": "#12-28",
   "series": "UNF",
   "tpi_or_pitch": 28,
   "major_dia_in": 0.216,
   "theoretical_drill_in": 0.1812,
   "tap_drill": "#14",
   "drill_dia_in": 0.182,
   "actual_engagement_pct": 73.2,
   "far_from_nominal": "",
   "clearance_drill": "D"
  },
  {
   "thread": "1/4-28",
   "series": "UNF",
   "tpi_or_pitch": 28,
   "major_dia_in": 0.25,
   "theoretical_drill_in": 0.2152,
   "tap_drill": "#3",
   "drill_dia_in": 0.213,
   "actual_engagement_pct": 79.7,
   "far_from_nominal": "",
   "clearance_drill": "K"
  },
  {
   "thread": "5/16-24",
   "series": "UNF",
   "tpi_or_pitch": 24,
   "major_dia_in": 0.3125,
   "theoretical_drill_in": 0.2719,
   "tap_drill": "I",
   "drill_dia_in": 0.272,
   "actual_engagement_pct": 74.8,
   "far_from_nominal": "",
   "clearance_drill": "11/32\""
  },
  {
   "thread": "3/8-24",
   "series": "UNF",
   "tpi_or_pitch": 24,
   "major_dia_in": 0.375,
   "theoretical_drill_in": 0.3344,
   "tap_drill": "Q",
   "drill_dia_in": 0.332,
   "actual_engagement_pct": 79.4,
   "far_from_nominal": "",
   "clearance_drill": "13/32\""
  },
  {
   "thread": "7/16-20",
   "series": "UNF",
   "tpi_or_pitch": 20,
   "major_dia_in": 0.4375,
   "theoretical_drill_in": 0.3887,
   "tap_drill": "25/64\"",
   "drill_dia_in": 0.3906,
   "actual_engagement_pct": 72.2,
   "far_from_nominal": "",
   "clearance_drill": "15/32\""
  },
  {
   "thread": "1/2-20",
   "series": "UNF",
   "tpi_or_pitch": 20,
   "major_dia_in": 0.5,
   "theoretical_drill_in": 0.4512,
   "tap_drill": "29/64\"",
   "drill_dia_in": 0.4531,
   "actual_engagement_pct": 72.2,
   "far_from_nominal": "",
   "clearance_drill": "17/32\""
  },
  {
   "thread": "9/16-18",
   "series": "UNF",
   "tpi_or_pitch": 18,
   "major_dia_in": 0.5625,
   "theoretical_drill_in": 0.5083,
   "tap_drill": "33/64\"",
   "drill_dia_in": 0.5156,
   "actual_engagement_pct": 64.9,
   "far_from_nominal": "yes",
   "clearance_drill": "19/32\""
  },
  {
   "thread": "5/8-18",
   "series": "UNF",
   "tpi_or_pitch": 18,
   "major_dia_in": 0.625,
   "theoretical_drill_in": 0.5708,
   "tap_drill": "37/64\"",
   "drill_dia_in": 0.5781,
   "actual_engagement_pct": 64.9,
   "far_from_nominal": "yes",
   "clearance_drill": "21/32\""
  },
  {
   "thread": "3/4-16",
   "series": "UNF",
   "tpi_or_pitch": 16,
   "major_dia_in": 0.75,
   "theoretical_drill_in": 0.6891,
   "tap_drill": "11/16\"",
   "drill_dia_in": 0.6875,
   "actual_engagement_pct": 76.9,
   "far_from_nominal": "",
   "clearance_drill": "25/32\""
  },
  {
   "thread": "7/8-14",
   "series": "UNF",
   "tpi_or_pitch": 14,
   "major_dia_in": 0.875,
   "theoretical_drill_in": 0.8054,
   "tap_drill": "13/16\"",
   "drill_dia_in": 0.8125,
   "actual_engagement_pct": 67.3,
   "far_from_nominal": "",
   "clearance_drill": "29/32\""
  },
  {
   "thread": "1-12",
   "series": "UNF",
   "tpi_or_pitch": 12,
   "major_dia_in": 1.0,
   "theoretical_drill_in": 0.9187,
   "tap_drill": "59/64\"",
   "drill_dia_in": 0.9219,
   "actual_engagement_pct": 72.1,
   "far_from_nominal": "",
   "clearance_drill": "1-1/32\""
  },
  {
   "thread": "1-1/8-12",
   "series": "UNF",
   "tpi_or_pitch": 12,
   "major_dia_in": 1.125,
   "theoretical_drill_in": 1.0437,
   "tap_drill": "1-3/64\"",
   "drill_dia_in": 1.0469,
   "actual_engagement_pct": 72.1,
   "far_from_nominal": "",
   "clearance_drill": "1-5/32\""
  },
  {
   "thread": "1-1/4-12",
   "series": "UNF",
   "tpi_or_pitch": 12,
   "major_dia_in": 1.25,
   "theoretical_drill_in": 1.1687,
   "tap_drill": "1-11/64\"",
   "drill_dia_in": 1.1719,
   "actual_engagement_pct": 72.1,
   "far_from_nominal": "",
   "clearance_drill": "1-9/32\""
  },
  {
   "thread": "1-3/8-12",
   "series": "UNF",
   "tpi_or_pitch": 12,
   "major_dia_in": 1.375,
   "theoretical_drill_in": 1.2937,
   "tap_drill": "1-19/64\"",
   "drill_dia_in": 1.2969,
   "actual_engagement_pct": 72.1,
   "far_from_nominal": "",
   "clearance_drill": "1-13/32\""
  },
  {
   "thread": "1-1/2-12",
   "series": "UNF",
   "tpi_or_pitch": 12,
   "major_dia_in": 1.5,
   "theoretical_drill_in": 1.4187,
   "tap_drill": "1-27/64\"",
   "drill_dia_in": 1.4219,
   "actual_engagement_pct": 72.1,
   "far_from_nominal": "",
   "clearance_drill": "1-17/32\""
  },
  {
   "thread": "M1.6\u00d70.35",
   "series": "Metric Coarse",
   "tpi_or_pitch": "0.35 mm",
   "major_dia_in": 0.063,
   "theoretical_drill_in": 1.258,
   "tap_drill": "1.3 mm",
   "drill_dia_in": 0.0512,
   "actual_engagement_pct": 65.8,
   "far_from_nominal": "yes",
   "clearance_drill": "2.4 mm"
  },
  {
   "thread": "M2\u00d70.4",
   "series": "Metric Coarse",
   "tpi_or_pitch": "0.4 mm",
   "major_dia_in": 0.0787,
   "theoretical_drill_in": 1.609,
   "tap_drill": "1.6 mm",
   "drill_dia_in": 0.063,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "2.8 mm"
  },
  {
   "thread": "M2.5\u00d70.45",
   "series": "Metric Coarse",
   "tpi_or_pitch": "0.45 mm",
   "major_dia_in": 0.0984,
   "theoretical_drill_in": 2.061,
   "tap_drill": "2.1 mm",
   "drill_dia_in": 0.0827,
   "actual_engagement_pct": 68.3,
   "far_from_nominal": "",
   "clearance_drill": "3.3 mm"
  },
  {
   "thread": "M3\u00d70.5",
   "series": "Metric Coarse",
   "tpi_or_pitch": "0.5 mm",
   "major_dia_in": 0.1181,
   "theoretical_drill_in": 2.512,
   "tap_drill": "2.5 mm",
   "drill_dia_in": 0.0984,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "3.8 mm"
  },
  {
   "thread": "M3.5\u00d70.6",
   "series": "Metric Coarse",
   "tpi_or_pitch": "0.6 mm",
   "major_dia_in": 0.1378,
   "theoretical_drill_in": 2.914,
   "tap_drill": "2.9 mm",
   "drill_dia_in": 0.1142,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "4.3 mm"
  },
  {
   "thread": "M4\u00d70.7",
   "series": "Metric Coarse",
   "tpi_or_pitch": "0.7 mm",
   "major_dia_in": 0.1575,
   "theoretical_drill_in": 3.316,
   "tap_drill": "3.3 mm",
   "drill_dia_in": 0.1299,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "4.8 mm"
  },
  {
   "thread": "M5\u00d70.8",
   "series": "Metric Coarse",
   "tpi_or_pitch": "0.8 mm",
   "major_dia_in": 0.1969,
   "theoretical_drill_in": 4.219,
   "tap_drill": "4.2 mm",
   "drill_dia_in": 0.1654,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "5.8 mm"
  },
  {
   "thread": "M6\u00d71",
   "series": "Metric Coarse",
   "tpi_or_pitch": "1.0 mm",
   "major_dia_in": 0.2362,
   "theoretical_drill_in": 5.023,
   "tap_drill": "5.0 mm",
   "drill_dia_in": 0.1969,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "6.8 mm"
  },
  {
   "thread": "M8\u00d71.25",
   "series": "Metric Coarse",
   "tpi_or_pitch": "1.25 mm",
   "major_dia_in": 0.315,
   "theoretical_drill_in": 6.779,
   "tap_drill": "6.8 mm",
   "drill_dia_in": 0.2677,
   "actual_engagement_pct": 73.7,
   "far_from_nominal": "",
   "clearance_drill": "8.8 mm"
  },
  {
   "thread": "M10\u00d71.5",
   "series": "Metric Coarse",
   "tpi_or_pitch": "1.5 mm",
   "major_dia_in": 0.3937,
   "theoretical_drill_in": 8.535,
   "tap_drill": "8.5 mm",
   "drill_dia_in": 0.3346,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "10.8 mm"
  },
  {
   "thread": "M12\u00d71.75",
   "series": "Metric Coarse",
   "tpi_or_pitch": "1.75 mm",
   "major_dia_in": 0.4724,
   "theoretical_drill_in": 10.291,
   "tap_drill": "10.3 mm",
   "drill_dia_in": 0.4055,
   "actual_engagement_pct": 74.6,
   "far_from_nominal": "",
   "clearance_drill": "12.8 mm"
  },
  {
   "thread": "M14\u00d72",
   "series": "Metric Coarse",
   "tpi_or_pitch": "2.0 mm",
   "major_dia_in": 0.5512,
   "theoretical_drill_in": 12.047,
   "tap_drill": "12.0 mm",
   "drill_dia_in": 0.4724,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "14.8 mm"
  },
  {
   "thread": "M16\u00d72",
   "series": "Metric Coarse",
   "tpi_or_pitch": "2.0 mm",
   "major_dia_in": 0.6299,
   "theoretical_drill_in": 14.047,
   "tap_drill": "14.0 mm",
   "drill_dia_in": 0.5512,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "16.8 mm"
  },
  {
   "thread": "M18\u00d72.5",
   "series": "Metric Coarse",
   "tpi_or_pitch": "2.5 mm",
   "major_dia_in": 0.7087,
   "theoretical_drill_in": 15.559,
   "tap_drill": "15.6 mm",
   "drill_dia_in": 0.6142,
   "actual_engagement_pct": 73.7,
   "far_from_nominal": "",
   "clearance_drill": "18.8 mm"
  },
  {
   "thread": "M20\u00d72.5",
   "series": "Metric Coarse",
   "tpi_or_pitch": "2.5 mm",
   "major_dia_in": 0.7874,
   "theoretical_drill_in": 17.559,
   "tap_drill": "17.6 mm",
   "drill_dia_in": 0.6929,
   "actual_engagement_pct": 73.7,
   "far_from_nominal": "",
   "clearance_drill": "20.8 mm"
  },
  {
   "thread": "M22\u00d72.5",
   "series": "Metric Coarse",
   "tpi_or_pitch": "2.5 mm",
   "major_dia_in": 0.8661,
   "theoretical_drill_in": 19.559,
   "tap_drill": "19.6 mm",
   "drill_dia_in": 0.7717,
   "actual_engagement_pct": 73.7,
   "far_from_nominal": "",
   "clearance_drill": "22.8 mm"
  },
  {
   "thread": "M24\u00d73",
   "series": "Metric Coarse",
   "tpi_or_pitch": "3.0 mm",
   "major_dia_in": 0.9449,
   "theoretical_drill_in": 21.07,
   "tap_drill": "21.1 mm",
   "drill_dia_in": 0.8307,
   "actual_engagement_pct": 74.2,
   "far_from_nominal": "",
   "clearance_drill": "24.8 mm"
  },
  {
   "thread": "M27\u00d73",
   "series": "Metric Coarse",
   "tpi_or_pitch": "3.0 mm",
   "major_dia_in": 1.063,
   "theoretical_drill_in": 24.07,
   "tap_drill": "24.1 mm",
   "drill_dia_in": 0.9488,
   "actual_engagement_pct": 74.2,
   "far_from_nominal": "",
   "clearance_drill": "27.8 mm"
  },
  {
   "thread": "M30\u00d73.5",
   "series": "Metric Coarse",
   "tpi_or_pitch": "3.5 mm",
   "major_dia_in": 1.1811,
   "theoretical_drill_in": 26.582,
   "tap_drill": "26.6 mm",
   "drill_dia_in": 1.0472,
   "actual_engagement_pct": 74.6,
   "far_from_nominal": "",
   "clearance_drill": "30.0 mm"
  },
  {
   "thread": "M8\u00d71",
   "series": "Metric Fine",
   "tpi_or_pitch": "1.0 mm",
   "major_dia_in": 0.315,
   "theoretical_drill_in": 7.023,
   "tap_drill": "7.0 mm",
   "drill_dia_in": 0.2756,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "8.8 mm"
  },
  {
   "thread": "M10\u00d71.25",
   "series": "Metric Fine",
   "tpi_or_pitch": "1.25 mm",
   "major_dia_in": 0.3937,
   "theoretical_drill_in": 8.779,
   "tap_drill": "8.8 mm",
   "drill_dia_in": 0.3465,
   "actual_engagement_pct": 73.7,
   "far_from_nominal": "",
   "clearance_drill": "10.8 mm"
  },
  {
   "thread": "M10\u00d71",
   "series": "Metric Fine",
   "tpi_or_pitch": "1.0 mm",
   "major_dia_in": 0.3937,
   "theoretical_drill_in": 9.023,
   "tap_drill": "9.0 mm",
   "drill_dia_in": 0.3543,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "10.8 mm"
  },
  {
   "thread": "M12\u00d71.5",
   "series": "Metric Fine",
   "tpi_or_pitch": "1.5 mm",
   "major_dia_in": 0.4724,
   "theoretical_drill_in": 10.535,
   "tap_drill": "10.5 mm",
   "drill_dia_in": 0.4134,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "12.8 mm"
  },
  {
   "thread": "M12\u00d71.25",
   "series": "Metric Fine",
   "tpi_or_pitch": "1.25 mm",
   "major_dia_in": 0.4724,
   "theoretical_drill_in": 10.779,
   "tap_drill": "10.8 mm",
   "drill_dia_in": 0.4252,
   "actual_engagement_pct": 73.7,
   "far_from_nominal": "",
   "clearance_drill": "12.8 mm"
  },
  {
   "thread": "M14\u00d71.5",
   "series": "Metric Fine",
   "tpi_or_pitch": "1.5 mm",
   "major_dia_in": 0.5512,
   "theoretical_drill_in": 12.535,
   "tap_drill": "12.5 mm",
   "drill_dia_in": 0.4921,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "14.8 mm"
  },
  {
   "thread": "M16\u00d71.5",
   "series": "Metric Fine",
   "tpi_or_pitch": "1.5 mm",
   "major_dia_in": 0.6299,
   "theoretical_drill_in": 14.535,
   "tap_drill": "14.5 mm",
   "drill_dia_in": 0.5709,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "16.8 mm"
  },
  {
   "thread": "M18\u00d71.5",
   "series": "Metric Fine",
   "tpi_or_pitch": "1.5 mm",
   "major_dia_in": 0.7087,
   "theoretical_drill_in": 16.535,
   "tap_drill": "16.5 mm",
   "drill_dia_in": 0.6496,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "18.8 mm"
  },
  {
   "thread": "M20\u00d71.5",
   "series": "Metric Fine",
   "tpi_or_pitch": "1.5 mm",
   "major_dia_in": 0.7874,
   "theoretical_drill_in": 18.535,
   "tap_drill": "18.5 mm",
   "drill_dia_in": 0.7283,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "20.8 mm"
  },
  {
   "thread": "M22\u00d71.5",
   "series": "Metric Fine",
   "tpi_or_pitch": "1.5 mm",
   "major_dia_in": 0.8661,
   "theoretical_drill_in": 20.535,
   "tap_drill": "20.5 mm",
   "drill_dia_in": 0.8071,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "22.8 mm"
  },
  {
   "thread": "M24\u00d72",
   "series": "Metric Fine",
   "tpi_or_pitch": "2.0 mm",
   "major_dia_in": 0.9449,
   "theoretical_drill_in": 22.047,
   "tap_drill": "22.0 mm",
   "drill_dia_in": 0.8661,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "24.8 mm"
  },
  {
   "thread": "M27\u00d72",
   "series": "Metric Fine",
   "tpi_or_pitch": "2.0 mm",
   "major_dia_in": 1.063,
   "theoretical_drill_in": 25.047,
   "tap_drill": "25.0 mm",
   "drill_dia_in": 0.9843,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "27.8 mm"
  },
  {
   "thread": "M30\u00d72",
   "series": "Metric Fine",
   "tpi_or_pitch": "2.0 mm",
   "major_dia_in": 1.1811,
   "theoretical_drill_in": 28.047,
   "tap_drill": "28.0 mm",
   "drill_dia_in": 1.1024,
   "actual_engagement_pct": 76.8,
   "far_from_nominal": "",
   "clearance_drill": "30.0 mm"
  }
 ]
}