{
 "meta": {
  "title": "Drill Bit Size Chart",
  "rows": 352,
  "series": {
   "fraction": 96,
   "number": 80,
   "letter": 26,
   "metric": 150
  },
  "method": "All conversions computed (1 in = 25.4 mm exactly). Sizes are public fact; the four-series merge and equivalence grouping are original editorial work.",
  "equivalence_tolerance_in": 0.002,
  "equivalence_method": "Pairwise: a size lists only those within TOL of itself. Not chain-linked clustering, which lets a chain of compliant steps accumulate into a non-compliant span.",
  "note": "Equivalent group = sizes within 0.002 in of each other, generally interchangeable for clearance holes but NOT for reamed or tapped holes."
 },
 "columns": [
  "size",
  "system",
  "diameter_in",
  "diameter_mm",
  "interchangeable_with"
 ],
 "rows": [
  {
   "size": "#80",
   "system": "number",
   "diameter_in": 0.0135,
   "diameter_mm": 0.343,
   "interchangeable_with": "#79"
  },
  {
   "size": "#79",
   "system": "number",
   "diameter_in": 0.0145,
   "diameter_mm": 0.368,
   "interchangeable_with": "#80, 1/64\", #78"
  },
  {
   "size": "1/64\"",
   "system": "fraction",
   "diameter_in": 0.0156,
   "diameter_mm": 0.397,
   "interchangeable_with": "#79, #78"
  },
  {
   "size": "#78",
   "system": "number",
   "diameter_in": 0.016,
   "diameter_mm": 0.406,
   "interchangeable_with": "1/64\", #79, #77"
  },
  {
   "size": "#77",
   "system": "number",
   "diameter_in": 0.018,
   "diameter_mm": 0.457,
   "interchangeable_with": "#78, 0.5 mm"
  },
  {
   "size": "0.5 mm",
   "system": "metric",
   "diameter_in": 0.0197,
   "diameter_mm": 0.5,
   "interchangeable_with": "#77, #76, #75"
  },
  {
   "size": "#76",
   "system": "number",
   "diameter_in": 0.02,
   "diameter_mm": 0.508,
   "interchangeable_with": "0.5 mm, #75"
  },
  {
   "size": "#75",
   "system": "number",
   "diameter_in": 0.021,
   "diameter_mm": 0.533,
   "interchangeable_with": "#76, 0.5 mm, #74"
  },
  {
   "size": "#74",
   "system": "number",
   "diameter_in": 0.0225,
   "diameter_mm": 0.571,
   "interchangeable_with": "#75, 0.6 mm, #73"
  },
  {
   "size": "0.6 mm",
   "system": "metric",
   "diameter_in": 0.0236,
   "diameter_mm": 0.6,
   "interchangeable_with": "#74, #73, #72"
  },
  {
   "size": "#73",
   "system": "number",
   "diameter_in": 0.024,
   "diameter_mm": 0.61,
   "interchangeable_with": "0.6 mm, #74, #72, #71"
  },
  {
   "size": "#72",
   "system": "number",
   "diameter_in": 0.025,
   "diameter_mm": 0.635,
   "interchangeable_with": "#73, 0.6 mm, #71"
  },
  {
   "size": "#71",
   "system": "number",
   "diameter_in": 0.026,
   "diameter_mm": 0.66,
   "interchangeable_with": "#72, #73, 0.7 mm"
  },
  {
   "size": "0.7 mm",
   "system": "metric",
   "diameter_in": 0.0276,
   "diameter_mm": 0.7,
   "interchangeable_with": "#71, #70, #69"
  },
  {
   "size": "#70",
   "system": "number",
   "diameter_in": 0.028,
   "diameter_mm": 0.711,
   "interchangeable_with": "0.7 mm, #69"
  },
  {
   "size": "#69",
   "system": "number",
   "diameter_in": 0.0292,
   "diameter_mm": 0.742,
   "interchangeable_with": "#70, 0.7 mm, #68"
  },
  {
   "size": "#68",
   "system": "number",
   "diameter_in": 0.031,
   "diameter_mm": 0.787,
   "interchangeable_with": "#69, 1/32\", 0.8 mm, #67"
  },
  {
   "size": "1/32\"",
   "system": "fraction",
   "diameter_in": 0.0312,
   "diameter_mm": 0.794,
   "interchangeable_with": "#68, 0.8 mm, #67, #66"
  },
  {
   "size": "0.8 mm",
   "system": "metric",
   "diameter_in": 0.0315,
   "diameter_mm": 0.8,
   "interchangeable_with": "1/32\", #68, #67, #66"
  },
  {
   "size": "#67",
   "system": "number",
   "diameter_in": 0.032,
   "diameter_mm": 0.813,
   "interchangeable_with": "0.8 mm, 1/32\", #68, #66"
  },
  {
   "size": "#66",
   "system": "number",
   "diameter_in": 0.033,
   "diameter_mm": 0.838,
   "interchangeable_with": "#67, 0.8 mm, 1/32\""
  },
  {
   "size": "#65",
   "system": "number",
   "diameter_in": 0.035,
   "diameter_mm": 0.889,
   "interchangeable_with": "0.9 mm, #64, #63"
  },
  {
   "size": "0.9 mm",
   "system": "metric",
   "diameter_in": 0.0354,
   "diameter_mm": 0.9,
   "interchangeable_with": "#65, #64, #63"
  },
  {
   "size": "#64",
   "system": "number",
   "diameter_in": 0.036,
   "diameter_mm": 0.914,
   "interchangeable_with": "0.9 mm, #65, #63"
  },
  {
   "size": "#63",
   "system": "number",
   "diameter_in": 0.037,
   "diameter_mm": 0.94,
   "interchangeable_with": "#64, 0.9 mm, #65, #62"
  },
  {
   "size": "#62",
   "system": "number",
   "diameter_in": 0.038,
   "diameter_mm": 0.965,
   "interchangeable_with": "#63, #61, 1.0 mm"
  },
  {
   "size": "#61",
   "system": "number",
   "diameter_in": 0.039,
   "diameter_mm": 0.991,
   "interchangeable_with": "#62, 1.0 mm, #60"
  },
  {
   "size": "1.0 mm",
   "system": "metric",
   "diameter_in": 0.0394,
   "diameter_mm": 1.0,
   "interchangeable_with": "#61, #62, #60, #59"
  },
  {
   "size": "#60",
   "system": "number",
   "diameter_in": 0.04,
   "diameter_mm": 1.016,
   "interchangeable_with": "1.0 mm, #61, #59"
  },
  {
   "size": "#59",
   "system": "number",
   "diameter_in": 0.041,
   "diameter_mm": 1.041,
   "interchangeable_with": "#60, 1.0 mm, #58, #57"
  },
  {
   "size": "#58",
   "system": "number",
   "diameter_in": 0.042,
   "diameter_mm": 1.067,
   "interchangeable_with": "#59, #57, 1.1 mm"
  },
  {
   "size": "#57",
   "system": "number",
   "diameter_in": 0.043,
   "diameter_mm": 1.092,
   "interchangeable_with": "#58, #59, 1.1 mm"
  },
  {
   "size": "1.1 mm",
   "system": "metric",
   "diameter_in": 0.0433,
   "diameter_mm": 1.1,
   "interchangeable_with": "#57, #58"
  },
  {
   "size": "#56",
   "system": "number",
   "diameter_in": 0.0465,
   "diameter_mm": 1.181,
   "interchangeable_with": "3/64\", 1.2 mm"
  },
  {
   "size": "3/64\"",
   "system": "fraction",
   "diameter_in": 0.0469,
   "diameter_mm": 1.191,
   "interchangeable_with": "#56, 1.2 mm"
  },
  {
   "size": "1.2 mm",
   "system": "metric",
   "diameter_in": 0.0472,
   "diameter_mm": 1.2,
   "interchangeable_with": "3/64\", #56"
  },
  {
   "size": "1.3 mm",
   "system": "metric",
   "diameter_in": 0.0512,
   "diameter_mm": 1.3,
   "interchangeable_with": "#55"
  },
  {
   "size": "#55",
   "system": "number",
   "diameter_in": 0.052,
   "diameter_mm": 1.321,
   "interchangeable_with": "1.3 mm"
  },
  {
   "size": "#54",
   "system": "number",
   "diameter_in": 0.055,
   "diameter_mm": 1.397,
   "interchangeable_with": "1.4 mm"
  },
  {
   "size": "1.4 mm",
   "system": "metric",
   "diameter_in": 0.0551,
   "diameter_mm": 1.4,
   "interchangeable_with": "#54"
  },
  {
   "size": "1.5 mm",
   "system": "metric",
   "diameter_in": 0.0591,
   "diameter_mm": 1.5,
   "interchangeable_with": "#53"
  },
  {
   "size": "#53",
   "system": "number",
   "diameter_in": 0.0595,
   "diameter_mm": 1.511,
   "interchangeable_with": "1.5 mm"
  },
  {
   "size": "1/16\"",
   "system": "fraction",
   "diameter_in": 0.0625,
   "diameter_mm": 1.587,
   "interchangeable_with": "1.6 mm, #52"
  },
  {
   "size": "1.6 mm",
   "system": "metric",
   "diameter_in": 0.063,
   "diameter_mm": 1.6,
   "interchangeable_with": "1/16\", #52"
  },
  {
   "size": "#52",
   "system": "number",
   "diameter_in": 0.0635,
   "diameter_mm": 1.613,
   "interchangeable_with": "1.6 mm, 1/16\""
  },
  {
   "size": "1.7 mm",
   "system": "metric",
   "diameter_in": 0.0669,
   "diameter_mm": 1.7,
   "interchangeable_with": "#51"
  },
  {
   "size": "#51",
   "system": "number",
   "diameter_in": 0.067,
   "diameter_mm": 1.702,
   "interchangeable_with": "1.7 mm"
  },
  {
   "size": "#50",
   "system": "number",
   "diameter_in": 0.07,
   "diameter_mm": 1.778,
   "interchangeable_with": "1.8 mm"
  },
  {
   "size": "1.8 mm",
   "system": "metric",
   "diameter_in": 0.0709,
   "diameter_mm": 1.8,
   "interchangeable_with": "#50"
  },
  {
   "size": "#49",
   "system": "number",
   "diameter_in": 0.073,
   "diameter_mm": 1.854,
   "interchangeable_with": "1.9 mm"
  },
  {
   "size": "1.9 mm",
   "system": "metric",
   "diameter_in": 0.0748,
   "diameter_mm": 1.9,
   "interchangeable_with": "#49, #48"
  },
  {
   "size": "#48",
   "system": "number",
   "diameter_in": 0.076,
   "diameter_mm": 1.93,
   "interchangeable_with": "1.9 mm"
  },
  {
   "size": "5/64\"",
   "system": "fraction",
   "diameter_in": 0.0781,
   "diameter_mm": 1.984,
   "interchangeable_with": "#47, 2.0 mm"
  },
  {
   "size": "#47",
   "system": "number",
   "diameter_in": 0.0785,
   "diameter_mm": 1.994,
   "interchangeable_with": "5/64\", 2.0 mm"
  },
  {
   "size": "2.0 mm",
   "system": "metric",
   "diameter_in": 0.0787,
   "diameter_mm": 2.0,
   "interchangeable_with": "#47, 5/64\""
  },
  {
   "size": "#46",
   "system": "number",
   "diameter_in": 0.081,
   "diameter_mm": 2.057,
   "interchangeable_with": "#45, 2.1 mm"
  },
  {
   "size": "#45",
   "system": "number",
   "diameter_in": 0.082,
   "diameter_mm": 2.083,
   "interchangeable_with": "#46, 2.1 mm"
  },
  {
   "size": "2.1 mm",
   "system": "metric",
   "diameter_in": 0.0827,
   "diameter_mm": 2.1,
   "interchangeable_with": "#45, #46"
  },
  {
   "size": "#44",
   "system": "number",
   "diameter_in": 0.086,
   "diameter_mm": 2.184,
   "interchangeable_with": "2.2 mm"
  },
  {
   "size": "2.2 mm",
   "system": "metric",
   "diameter_in": 0.0866,
   "diameter_mm": 2.2,
   "interchangeable_with": "#44"
  },
  {
   "size": "#43",
   "system": "number",
   "diameter_in": 0.089,
   "diameter_mm": 2.261,
   "interchangeable_with": "2.3 mm"
  },
  {
   "size": "2.3 mm",
   "system": "metric",
   "diameter_in": 0.0906,
   "diameter_mm": 2.3,
   "interchangeable_with": "#43"
  },
  {
   "size": "#42",
   "system": "number",
   "diameter_in": 0.0935,
   "diameter_mm": 2.375,
   "interchangeable_with": "3/32\", 2.4 mm"
  },
  {
   "size": "3/32\"",
   "system": "fraction",
   "diameter_in": 0.0938,
   "diameter_mm": 2.381,
   "interchangeable_with": "#42, 2.4 mm"
  },
  {
   "size": "2.4 mm",
   "system": "metric",
   "diameter_in": 0.0945,
   "diameter_mm": 2.4,
   "interchangeable_with": "3/32\", #42, #41"
  },
  {
   "size": "#41",
   "system": "number",
   "diameter_in": 0.096,
   "diameter_mm": 2.438,
   "interchangeable_with": "2.4 mm"
  },
  {
   "size": "#40",
   "system": "number",
   "diameter_in": 0.098,
   "diameter_mm": 2.489,
   "interchangeable_with": "2.5 mm, #39"
  },
  {
   "size": "2.5 mm",
   "system": "metric",
   "diameter_in": 0.0984,
   "diameter_mm": 2.5,
   "interchangeable_with": "#40, #39"
  },
  {
   "size": "#39",
   "system": "number",
   "diameter_in": 0.0995,
   "diameter_mm": 2.527,
   "interchangeable_with": "2.5 mm, #40"
  },
  {
   "size": "#38",
   "system": "number",
   "diameter_in": 0.1015,
   "diameter_mm": 2.578,
   "interchangeable_with": "2.6 mm"
  },
  {
   "size": "2.6 mm",
   "system": "metric",
   "diameter_in": 0.1024,
   "diameter_mm": 2.6,
   "interchangeable_with": "#38, #37"
  },
  {
   "size": "#37",
   "system": "number",
   "diameter_in": 0.104,
   "diameter_mm": 2.642,
   "interchangeable_with": "2.6 mm"
  },
  {
   "size": "2.7 mm",
   "system": "metric",
   "diameter_in": 0.1063,
   "diameter_mm": 2.7,
   "interchangeable_with": "#36"
  },
  {
   "size": "#36",
   "system": "number",
   "diameter_in": 0.1065,
   "diameter_mm": 2.705,
   "interchangeable_with": "2.7 mm"
  },
  {
   "size": "7/64\"",
   "system": "fraction",
   "diameter_in": 0.1094,
   "diameter_mm": 2.778,
   "interchangeable_with": "#35, 2.8 mm, #34"
  },
  {
   "size": "#35",
   "system": "number",
   "diameter_in": 0.11,
   "diameter_mm": 2.794,
   "interchangeable_with": "7/64\", 2.8 mm, #34"
  },
  {
   "size": "2.8 mm",
   "system": "metric",
   "diameter_in": 0.1102,
   "diameter_mm": 2.8,
   "interchangeable_with": "#35, 7/64\", #34"
  },
  {
   "size": "#34",
   "system": "number",
   "diameter_in": 0.111,
   "diameter_mm": 2.819,
   "interchangeable_with": "2.8 mm, #35, 7/64\""
  },
  {
   "size": "#33",
   "system": "number",
   "diameter_in": 0.113,
   "diameter_mm": 2.87,
   "interchangeable_with": "2.9 mm"
  },
  {
   "size": "2.9 mm",
   "system": "metric",
   "diameter_in": 0.1142,
   "diameter_mm": 2.9,
   "interchangeable_with": "#33, #32"
  },
  {
   "size": "#32",
   "system": "number",
   "diameter_in": 0.116,
   "diameter_mm": 2.946,
   "interchangeable_with": "2.9 mm"
  },
  {
   "size": "3.0 mm",
   "system": "metric",
   "diameter_in": 0.1181,
   "diameter_mm": 3.0,
   "interchangeable_with": "#31"
  },
  {
   "size": "#31",
   "system": "number",
   "diameter_in": 0.12,
   "diameter_mm": 3.048,
   "interchangeable_with": "3.0 mm"
  },
  {
   "size": "3.1 mm",
   "system": "metric",
   "diameter_in": 0.1221,
   "diameter_mm": 3.1,
   "interchangeable_with": ""
  },
  {
   "size": "1/8\"",
   "system": "fraction",
   "diameter_in": 0.125,
   "diameter_mm": 3.175,
   "interchangeable_with": "3.2 mm"
  },
  {
   "size": "3.2 mm",
   "system": "metric",
   "diameter_in": 0.126,
   "diameter_mm": 3.2,
   "interchangeable_with": "1/8\""
  },
  {
   "size": "#30",
   "system": "number",
   "diameter_in": 0.1285,
   "diameter_mm": 3.264,
   "interchangeable_with": "3.3 mm"
  },
  {
   "size": "3.3 mm",
   "system": "metric",
   "diameter_in": 0.1299,
   "diameter_mm": 3.3,
   "interchangeable_with": "#30"
  },
  {
   "size": "3.4 mm",
   "system": "metric",
   "diameter_in": 0.1339,
   "diameter_mm": 3.4,
   "interchangeable_with": ""
  },
  {
   "size": "#29",
   "system": "number",
   "diameter_in": 0.136,
   "diameter_mm": 3.454,
   "interchangeable_with": "3.5 mm"
  },
  {
   "size": "3.5 mm",
   "system": "metric",
   "diameter_in": 0.1378,
   "diameter_mm": 3.5,
   "interchangeable_with": "#29"
  },
  {
   "size": "#28",
   "system": "number",
   "diameter_in": 0.1405,
   "diameter_mm": 3.569,
   "interchangeable_with": "9/64\", 3.6 mm"
  },
  {
   "size": "9/64\"",
   "system": "fraction",
   "diameter_in": 0.1406,
   "diameter_mm": 3.572,
   "interchangeable_with": "#28, 3.6 mm"
  },
  {
   "size": "3.6 mm",
   "system": "metric",
   "diameter_in": 0.1417,
   "diameter_mm": 3.6,
   "interchangeable_with": "9/64\", #28"
  },
  {
   "size": "#27",
   "system": "number",
   "diameter_in": 0.144,
   "diameter_mm": 3.658,
   "interchangeable_with": "3.7 mm"
  },
  {
   "size": "3.7 mm",
   "system": "metric",
   "diameter_in": 0.1457,
   "diameter_mm": 3.7,
   "interchangeable_with": "#27, #26"
  },
  {
   "size": "#26",
   "system": "number",
   "diameter_in": 0.147,
   "diameter_mm": 3.734,
   "interchangeable_with": "3.7 mm"
  },
  {
   "size": "#25",
   "system": "number",
   "diameter_in": 0.1495,
   "diameter_mm": 3.797,
   "interchangeable_with": "3.8 mm"
  },
  {
   "size": "3.8 mm",
   "system": "metric",
   "diameter_in": 0.1496,
   "diameter_mm": 3.8,
   "interchangeable_with": "#25"
  },
  {
   "size": "#24",
   "system": "number",
   "diameter_in": 0.152,
   "diameter_mm": 3.861,
   "interchangeable_with": "3.9 mm"
  },
  {
   "size": "3.9 mm",
   "system": "metric",
   "diameter_in": 0.1535,
   "diameter_mm": 3.9,
   "interchangeable_with": "#24, #23"
  },
  {
   "size": "#23",
   "system": "number",
   "diameter_in": 0.154,
   "diameter_mm": 3.912,
   "interchangeable_with": "3.9 mm"
  },
  {
   "size": "5/32\"",
   "system": "fraction",
   "diameter_in": 0.1562,
   "diameter_mm": 3.969,
   "interchangeable_with": "#22, 4.0 mm"
  },
  {
   "size": "#22",
   "system": "number",
   "diameter_in": 0.157,
   "diameter_mm": 3.988,
   "interchangeable_with": "5/32\", 4.0 mm"
  },
  {
   "size": "4.0 mm",
   "system": "metric",
   "diameter_in": 0.1575,
   "diameter_mm": 4.0,
   "interchangeable_with": "#22, 5/32\", #21"
  },
  {
   "size": "#21",
   "system": "number",
   "diameter_in": 0.159,
   "diameter_mm": 4.039,
   "interchangeable_with": "4.0 mm"
  },
  {
   "size": "#20",
   "system": "number",
   "diameter_in": 0.161,
   "diameter_mm": 4.089,
   "interchangeable_with": "4.1 mm"
  },
  {
   "size": "4.1 mm",
   "system": "metric",
   "diameter_in": 0.1614,
   "diameter_mm": 4.1,
   "interchangeable_with": "#20"
  },
  {
   "size": "4.2 mm",
   "system": "metric",
   "diameter_in": 0.1653,
   "diameter_mm": 4.2,
   "interchangeable_with": "#19"
  },
  {
   "size": "#19",
   "system": "number",
   "diameter_in": 0.166,
   "diameter_mm": 4.216,
   "interchangeable_with": "4.2 mm"
  },
  {
   "size": "4.3 mm",
   "system": "metric",
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   "interchangeable_with": "4.3 mm"
  },
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   "interchangeable_with": "#17, 4.4 mm"
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   "system": "number",
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   "interchangeable_with": "11/64\", 4.4 mm"
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   "size": "4.4 mm",
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   "interchangeable_with": "#17, 11/64\""
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   "diameter_mm": 4.5,
   "interchangeable_with": "#16"
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   "diameter_mm": 4.7,
   "interchangeable_with": "#13"
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   "interchangeable_with": "4.8 mm, #12"
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   "interchangeable_with": "4.8 mm, 3/16\""
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   "diameter_mm": 4.9,
   "interchangeable_with": "#11, #10"
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   "interchangeable_with": "4.9 mm"
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   "size": "5.0 mm",
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   "diameter_mm": 5.0,
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   "size": "5.1 mm",
   "system": "metric",
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   "diameter_mm": 5.1,
   "interchangeable_with": "#8, #7"
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   "interchangeable_with": "5.1 mm"
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   "size": "13/64\"",
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   "diameter_mm": 5.182,
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   "size": "5.2 mm",
   "system": "metric",
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   "diameter_mm": 5.2,
   "interchangeable_with": "#6, 13/64\", #5"
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   "diameter_mm": 5.22,
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   "system": "metric",
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   "diameter_mm": 5.3,
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   "system": "number",
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   "size": "5.8 mm",
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   "interchangeable_with": "#1"
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   "interchangeable_with": ""
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   "interchangeable_with": ""
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   "interchangeable_with": ""
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   "interchangeable_with": ""
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   "interchangeable_with": ""
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   "interchangeable_with": ""
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 ]
}