{ "version": "v1", "generated": "2026-10-18T08:11:34.274Z", "site": "https://lavignelabs.net", "license": "Reference values published as-is for free use and printing in your own shop; verify against your own tooling before cutting. Attribution to Lavigne Labs appreciated.", "charts": [ { "slug": "metric-tap-drills", "title": "Metric Tap Drill Chart (M1–M24)", "description": "ISO metric coarse and fine tap drill sizes M1–M24 (75% thread, 65% for hard material) with clearance holes, SHCS counterbores and FHCS countersinks. All sizes in mm.", "pageUrl": "https://lavignelabs.net/tools/charts/metric-tap-drills/", "pdfA4Url": "https://lavignelabs.net/tools/charts/metric-tap-drills-a4.pdf", "pdfLetterUrl": "https://lavignelabs.net/tools/charts/metric-tap-drills-letter.pdf", "jsonUrl": "https://lavignelabs.net/api/v1/charts/metric-tap-drills.json", "data": { "units": "mm", "notes": "tap = 75% thread drill; tapHard = 65% thread drill for hard material; clear* = clearance holes (close/normal/loose); shcsCbore/shcsCboreDepth = socket head cap screw counterbore diameter and depth; fhcsCsink = flat head countersink diameter. null = no value listed.", "rows": [ { "size": "M1", "d": 1, "pitch": 0.25, "series": "coarse", "tap": 0.75, "tapHard": 0.8, "clearClose": 1.1, "clearNormal": 1.2, "clearLoose": 1.3, "shcsCbore": null, "shcsCboreDepth": null, "fhcsCsink": null }, { "size": "M1.2", "d": 1.2, "pitch": 0.25, "series": "coarse", "tap": 0.95, "tapHard": 1, "clearClose": 1.3, "clearNormal": 1.4, "clearLoose": 1.5, "shcsCbore": null, "shcsCboreDepth": null, "fhcsCsink": null }, { "size": "M1.4", "d": 1.4, "pitch": 0.3, "series": "coarse", "tap": 1.1, "tapHard": 1.15, "clearClose": 1.5, "clearNormal": 1.6, "clearLoose": 1.8, "shcsCbore": null, "shcsCboreDepth": null, "fhcsCsink": null }, { "size": "M1.6", "d": 1.6, "pitch": 0.35, "series": "coarse", "tap": 1.25, "tapHard": 1.3, "clearClose": 1.7, "clearNormal": 1.8, "clearLoose": 2, "shcsCbore": null, "shcsCboreDepth": null, "fhcsCsink": null }, { "size": "M1.8", "d": 1.8, "pitch": 0.35, "series": "coarse", "tap": 1.45, "tapHard": 1.5, "clearClose": 1.9, "clearNormal": 2, "clearLoose": 2.1, "shcsCbore": null, "shcsCboreDepth": null, "fhcsCsink": null }, { "size": "M2", "d": 2, "pitch": 0.4, "series": "coarse", "tap": 1.6, "tapHard": 1.65, "clearClose": 2.2, "clearNormal": 2.4, "clearLoose": 2.6, "shcsCbore": 4.4, "shcsCboreDepth": 2, "fhcsCsink": null }, { "size": "M2.2", "d": 2.2, "pitch": 0.45, "series": "coarse", "tap": 1.75, "tapHard": 1.8, "clearClose": 2.4, "clearNormal": 2.6, "clearLoose": 2.8, "shcsCbore": null, "shcsCboreDepth": null, "fhcsCsink": null }, { "size": "M2.5", "d": 2.5, "pitch": 0.45, "series": "coarse", "tap": 2.05, "tapHard": 2.1, "clearClose": 2.7, "clearNormal": 2.9, "clearLoose": 3.1, "shcsCbore": 5.4, "shcsCboreDepth": 2.5, "fhcsCsink": null }, { "size": "M3", "d": 3, "pitch": 0.5, "series": "coarse", "tap": 2.5, "tapHard": 2.6, "clearClose": 3.2, "clearNormal": 3.4, "clearLoose": 3.6, "shcsCbore": 6.5, "shcsCboreDepth": 3, "fhcsCsink": 6.72 }, { "size": "M3.5", "d": 3.5, "pitch": 0.6, "series": "coarse", "tap": 2.9, "tapHard": 3, "clearClose": 3.7, "clearNormal": 3.9, "clearLoose": 4.2, "shcsCbore": null, "shcsCboreDepth": null, "fhcsCsink": null }, { "size": "M4", "d": 4, "pitch": 0.7, "series": "coarse", "tap": 3.3, "tapHard": 3.4, "clearClose": 4.3, "clearNormal": 4.5, "clearLoose": 4.8, "shcsCbore": 8.25, "shcsCboreDepth": 4, "fhcsCsink": 8.96 }, { "size": "M5", "d": 5, "pitch": 0.8, "series": "coarse", "tap": 4.2, "tapHard": 4.3, "clearClose": 5.3, "clearNormal": 5.5, "clearLoose": 5.8, "shcsCbore": 9.75, "shcsCboreDepth": 5, "fhcsCsink": 11.2 }, { "size": "M6", "d": 6, "pitch": 1, "series": "coarse", "tap": 5, "tapHard": 5.2, "clearClose": 6.4, "clearNormal": 6.6, "clearLoose": 7, "shcsCbore": 11.2, "shcsCboreDepth": 6, "fhcsCsink": 13.44 }, { "size": "M7", "d": 7, "pitch": 1, "series": "coarse", "tap": 6, "tapHard": 6.2, "clearClose": 7.4, "clearNormal": 7.6, "clearLoose": 8, "shcsCbore": null, "shcsCboreDepth": null, "fhcsCsink": null }, { "size": "M8", "d": 8, "pitch": 1.25, "series": "coarse", "tap": 6.8, "tapHard": 6.9, "clearClose": 8.4, "clearNormal": 9, "clearLoose": 10, "shcsCbore": 14.5, "shcsCboreDepth": 8, "fhcsCsink": 17.92 }, { "size": "M10", "d": 10, "pitch": 1.5, "series": "coarse", "tap": 8.5, "tapHard": 8.7, "clearClose": 10.5, "clearNormal": 11, "clearLoose": 12, "shcsCbore": 17.5, "shcsCboreDepth": 10, "fhcsCsink": 22.4 }, { "size": "M12", "d": 12, "pitch": 1.75, "series": "coarse", "tap": 10.2, "tapHard": 10.5, "clearClose": 13, "clearNormal": 13.5, "clearLoose": 14.5, "shcsCbore": 19.5, "shcsCboreDepth": 12, "fhcsCsink": 26.88 }, { "size": "M14", "d": 14, "pitch": 2, "series": "coarse", "tap": 12, "tapHard": 12.3, "clearClose": 15, "clearNormal": 15.5, "clearLoose": 16.5, "shcsCbore": 22.5, "shcsCboreDepth": 14, "fhcsCsink": 30.8 }, { "size": "M16", "d": 16, "pitch": 2, "series": "coarse", "tap": 14, "tapHard": 14.3, "clearClose": 17, "clearNormal": 17.5, "clearLoose": 18.5, "shcsCbore": 25.5, "shcsCboreDepth": 16, "fhcsCsink": 33.6 }, { "size": "M18", "d": 18, "pitch": 2.5, "series": "coarse", "tap": 15.5, "tapHard": 15.9, "clearClose": 19, "clearNormal": 20, "clearLoose": 21, "shcsCbore": 28.5, "shcsCboreDepth": 18, "fhcsCsink": null }, { "size": "M20", "d": 20, "pitch": 2.5, "series": "coarse", "tap": 17.5, "tapHard": 17.9, "clearClose": 21, "clearNormal": 22, "clearLoose": 24, "shcsCbore": 31.5, "shcsCboreDepth": 20, "fhcsCsink": 40.32 }, { "size": "M22", "d": 22, "pitch": 2.5, "series": "coarse", "tap": 19.5, "tapHard": 19.9, "clearClose": 23, "clearNormal": 24, "clearLoose": 26, "shcsCbore": null, "shcsCboreDepth": null, "fhcsCsink": null }, { "size": "M24", "d": 24, "pitch": 3, "series": "coarse", "tap": 21, "tapHard": 21.5, "clearClose": 25, "clearNormal": 26, "clearLoose": 28, "shcsCbore": null, "shcsCboreDepth": null, "fhcsCsink": null }, { "size": "M6", "d": 6, "pitch": 0.75, "series": "fine", "tap": 5.2, "tapHard": 5.4, "clearClose": 6.4, "clearNormal": 6.6, "clearLoose": 7, "shcsCbore": 11.2, "shcsCboreDepth": 6, "fhcsCsink": 13.44 }, { "size": "M8", "d": 8, "pitch": 1, "series": "fine", "tap": 7, "tapHard": 7.2, "clearClose": 8.4, "clearNormal": 9, "clearLoose": 10, "shcsCbore": 14.5, "shcsCboreDepth": 8, "fhcsCsink": 17.92 }, { "size": "M10", "d": 10, "pitch": 1, "series": "fine", "tap": 9, "tapHard": 9.2, "clearClose": 10.5, "clearNormal": 11, "clearLoose": 12, "shcsCbore": 17.5, "shcsCboreDepth": 10, "fhcsCsink": 22.4 }, { "size": "M10", "d": 10, "pitch": 1.25, "series": "fine", "tap": 8.8, "tapHard": 8.9, "clearClose": 10.5, "clearNormal": 11, "clearLoose": 12, "shcsCbore": 17.5, "shcsCboreDepth": 10, "fhcsCsink": 22.4 }, { "size": "M12", "d": 12, "pitch": 1.25, "series": "fine", "tap": 10.8, "tapHard": 10.9, "clearClose": 13, "clearNormal": 13.5, "clearLoose": 14.5, "shcsCbore": 19.5, "shcsCboreDepth": 12, "fhcsCsink": 26.88 }, { "size": "M12", "d": 12, "pitch": 1.5, "series": "fine", "tap": 10.5, "tapHard": 10.7, "clearClose": 13, "clearNormal": 13.5, "clearLoose": 14.5, "shcsCbore": 19.5, "shcsCboreDepth": 12, "fhcsCsink": 26.88 }, { "size": "M14", "d": 14, "pitch": 1.5, "series": "fine", "tap": 12.5, "tapHard": 12.7, "clearClose": 15, "clearNormal": 15.5, "clearLoose": 16.5, "shcsCbore": 22.5, "shcsCboreDepth": 14, "fhcsCsink": 30.8 }, { "size": "M16", "d": 16, "pitch": 1.5, "series": "fine", "tap": 14.5, "tapHard": 14.7, "clearClose": 17, "clearNormal": 17.5, "clearLoose": 18.5, "shcsCbore": 25.5, "shcsCboreDepth": 16, "fhcsCsink": 33.6 }, { "size": "M18", "d": 18, "pitch": 1.5, "series": "fine", "tap": 16.5, "tapHard": 16.7, "clearClose": 19, "clearNormal": 20, "clearLoose": 21, "shcsCbore": 28.5, "shcsCboreDepth": 18, "fhcsCsink": null }, { "size": "M20", "d": 20, "pitch": 1.5, "series": "fine", "tap": 18.5, "tapHard": 18.7, "clearClose": 21, "clearNormal": 22, "clearLoose": 24, "shcsCbore": 31.5, "shcsCboreDepth": 20, "fhcsCsink": 40.32 }, { "size": "M20", "d": 20, "pitch": 2, "series": "fine", "tap": 18, "tapHard": 18.3, "clearClose": 21, "clearNormal": 22, "clearLoose": 24, "shcsCbore": 31.5, "shcsCboreDepth": 20, "fhcsCsink": 40.32 }, { "size": "M22", "d": 22, "pitch": 1.5, "series": "fine", "tap": 20.5, "tapHard": 20.7, "clearClose": 23, "clearNormal": 24, "clearLoose": 26, "shcsCbore": null, "shcsCboreDepth": null, "fhcsCsink": null }, { "size": "M24", "d": 24, "pitch": 1.5, "series": "fine", "tap": 22.5, "tapHard": 22.7, "clearClose": 25, "clearNormal": 26, "clearLoose": 28, "shcsCbore": null, "shcsCboreDepth": null, "fhcsCsink": null }, { "size": "M24", "d": 24, "pitch": 2, "series": "fine", "tap": 22, "tapHard": 22.3, "clearClose": 25, "clearNormal": 26, "clearLoose": 28, "shcsCbore": null, "shcsCboreDepth": null, "fhcsCsink": null }, { "size": "M12", "d": 12, "pitch": 1, "series": "fine", "tap": 11, "tapHard": 11.2, "clearClose": 13, "clearNormal": 13.5, "clearLoose": 14.5, "shcsCbore": 19.5, "shcsCboreDepth": 12, "fhcsCsink": 26.88 }, { "size": "M14", "d": 14, "pitch": 1.25, "series": "fine", "tap": 12.8, "tapHard": 12.9, "clearClose": 15, "clearNormal": 15.5, "clearLoose": 16.5, "shcsCbore": 22.5, "shcsCboreDepth": 14, "fhcsCsink": 30.8 }, { "size": "M16", "d": 16, "pitch": 1, "series": "fine", "tap": 15, "tapHard": 15.2, "clearClose": 17, "clearNormal": 17.5, "clearLoose": 18.5, "shcsCbore": 25.5, "shcsCboreDepth": 16, "fhcsCsink": 33.6 }, { "size": "M18", "d": 18, "pitch": 2, "series": "fine", "tap": 16, "tapHard": 16.3, "clearClose": 19, "clearNormal": 20, "clearLoose": 21, "shcsCbore": 28.5, "shcsCboreDepth": 18, "fhcsCsink": null } ] } }, { "slug": "inch-tap-drills", "title": "Inch Tap Drill Chart (UNC / UNF #0–1/2)", "description": "UNC and UNF tap drill sizes #0 to 1/2 inch with number, letter and fraction drill designations, decimal inches, hard-material drills and clearance holes.", "pageUrl": "https://lavignelabs.net/tools/charts/inch-tap-drills/", "pdfA4Url": "https://lavignelabs.net/tools/charts/inch-tap-drills-a4.pdf", "pdfLetterUrl": "https://lavignelabs.net/tools/charts/inch-tap-drills-letter.pdf", "jsonUrl": "https://lavignelabs.net/api/v1/charts/inch-tap-drills.json", "data": { "units": "inch (decimal columns *Dec)", "notes": "tap = standard (about 75%) drill designation, tapHard = next size up for hard material, clearClose/clearFree = clearance-hole fits; *Dec = decimal inches.", "rows": [ { "size": "0-80", "series": "UNF", "major": 0.06, "tpi": 80, "tap": "#56", "tapDec": 0.0465, "tapHard": "#55", "tapHardDec": 0.052, "clearClose": "#52", "clearCloseDec": 0.0635, "clearFree": "#50", "clearFreeDec": 0.07 }, { "size": "1-64", "series": "UNC", "major": 0.073, "tpi": 64, "tap": "#53", "tapDec": 0.0595, "tapHard": "#53", "tapHardDec": 0.0595, "clearClose": "#48", "clearCloseDec": 0.076, "clearFree": "#46", "clearFreeDec": 0.081 }, { "size": "1-72", "series": "UNF", "major": 0.073, "tpi": 72, "tap": "#53", "tapDec": 0.0595, "tapHard": "1/16", "tapHardDec": 0.0625, "clearClose": "#48", "clearCloseDec": 0.076, "clearFree": "#46", "clearFreeDec": 0.081 }, { "size": "2-56", "series": "UNC", "major": 0.086, "tpi": 56, "tap": "#50", "tapDec": 0.07, "tapHard": "#50", "tapHardDec": 0.07, "clearClose": "#43", "clearCloseDec": 0.089, "clearFree": "#41", "clearFreeDec": 0.096 }, { "size": "2-64", "series": "UNF", "major": 0.086, "tpi": 64, "tap": "#50", "tapDec": 0.07, "tapHard": "#49", "tapHardDec": 0.073, "clearClose": "#43", "clearCloseDec": 0.089, "clearFree": "#41", "clearFreeDec": 0.096 }, { "size": "3-48", "series": "UNC", "major": 0.099, "tpi": 48, "tap": "#47", "tapDec": 0.0785, "tapHard": "#46", "tapHardDec": 0.081, "clearClose": "#37", "clearCloseDec": 0.104, "clearFree": "#35", "clearFreeDec": 0.11 }, { "size": "3-56", "series": "UNF", "major": 0.099, "tpi": 56, "tap": "#45", "tapDec": 0.082, "tapHard": "#45", "tapHardDec": 0.082, "clearClose": "#37", "clearCloseDec": 0.104, "clearFree": "#35", "clearFreeDec": 0.11 }, { "size": "4-40", "series": "UNC", "major": 0.112, "tpi": 40, "tap": "#43", "tapDec": 0.089, "tapHard": "#43", "tapHardDec": 0.089, "clearClose": "#32", "clearCloseDec": 0.116, "clearFree": "#30", "clearFreeDec": 0.1285 }, { "size": "4-48", "series": "UNF", "major": 0.112, "tpi": 48, "tap": "#42", "tapDec": 0.0935, "tapHard": "3/32", "tapHardDec": 0.0938, "clearClose": "#32", "clearCloseDec": 0.116, "clearFree": "#30", "clearFreeDec": 0.1285 }, { "size": "5-40", "series": "UNC", "major": 0.125, "tpi": 40, "tap": "#38", "tapDec": 0.1015, "tapHard": "#37", "tapHardDec": 0.104, "clearClose": "#30", "clearCloseDec": 0.1285, "clearFree": "#29", "clearFreeDec": 0.136 }, { "size": "5-44", "series": "UNF", "major": 0.125, "tpi": 44, "tap": "#37", "tapDec": 0.104, "tapHard": "#36", "tapHardDec": 0.1065, "clearClose": "#30", "clearCloseDec": 0.1285, "clearFree": "#29", "clearFreeDec": 0.136 }, { "size": "6-32", "series": "UNC", "major": 0.138, "tpi": 32, "tap": "#36", "tapDec": 0.1065, "tapHard": "#34", "tapHardDec": 0.111, "clearClose": "#27", "clearCloseDec": 0.144, "clearFree": "#25", "clearFreeDec": 0.1495 }, { "size": "6-40", "series": "UNF", "major": 0.138, "tpi": 40, "tap": "#33", "tapDec": 0.113, "tapHard": "#32", "tapHardDec": 0.116, "clearClose": "#27", "clearCloseDec": 0.144, "clearFree": "#25", "clearFreeDec": 0.1495 }, { "size": "8-32", "series": "UNC", "major": 0.164, "tpi": 32, "tap": "#29", "tapDec": 0.136, "tapHard": "#29", "tapHardDec": 0.136, "clearClose": "#18", "clearCloseDec": 0.1695, "clearFree": "#16", "clearFreeDec": 0.177 }, { "size": "8-36", "series": "UNF", "major": 0.164, "tpi": 36, "tap": "#29", "tapDec": 0.136, "tapHard": "#28", "tapHardDec": 0.1405, "clearClose": "#18", "clearCloseDec": 0.1695, "clearFree": "#16", "clearFreeDec": 0.177 }, { "size": "10-24", "series": "UNC", "major": 0.19, "tpi": 24, "tap": "#25", "tapDec": 0.1495, "tapHard": "#23", "tapHardDec": 0.154, "clearClose": "#9", "clearCloseDec": 0.196, "clearFree": "#7", "clearFreeDec": 0.201 }, { "size": "10-32", "series": "UNF", "major": 0.19, "tpi": 32, "tap": "#21", "tapDec": 0.159, "tapHard": "#19", "tapHardDec": 0.166, "clearClose": "#9", "clearCloseDec": 0.196, "clearFree": "#7", "clearFreeDec": 0.201 }, { "size": "12-24", "series": "UNC", "major": 0.216, "tpi": 24, "tap": "#16", "tapDec": 0.177, "tapHard": "#15", "tapHardDec": 0.18, "clearClose": "#2", "clearCloseDec": 0.221, "clearFree": "#1", "clearFreeDec": 0.228 }, { "size": "12-28", "series": "UNF", "major": 0.216, "tpi": 28, "tap": "#14", "tapDec": 0.182, "tapHard": "#13", "tapHardDec": 0.185, "clearClose": "#2", "clearCloseDec": 0.221, "clearFree": "#1", "clearFreeDec": 0.228 }, { "size": "1/4-20", "series": "UNC", "major": 0.25, "tpi": 20, "tap": "#7", "tapDec": 0.201, "tapHard": "#4", "tapHardDec": 0.209, "clearClose": "F", "clearCloseDec": 0.257, "clearFree": "H", "clearFreeDec": 0.266 }, { "size": "1/4-28", "series": "UNF", "major": 0.25, "tpi": 28, "tap": "#3", "tapDec": 0.213, "tapHard": "7/32", "tapHardDec": 0.2188, "clearClose": "F", "clearCloseDec": 0.257, "clearFree": "H", "clearFreeDec": 0.266 }, { "size": "5/16-18", "series": "UNC", "major": 0.3125, "tpi": 18, "tap": "F", "tapDec": 0.257, "tapHard": "17/64", "tapHardDec": 0.2656, "clearClose": "P", "clearCloseDec": 0.323, "clearFree": "Q", "clearFreeDec": 0.332 }, { "size": "5/16-24", "series": "UNF", "major": 0.3125, "tpi": 24, "tap": "I", "tapDec": 0.272, "tapHard": "J", "tapHardDec": 0.277, "clearClose": "P", "clearCloseDec": 0.323, "clearFree": "Q", "clearFreeDec": 0.332 }, { "size": "3/8-16", "series": "UNC", "major": 0.375, "tpi": 16, "tap": "5/16", "tapDec": 0.3125, "tapHard": "P", "tapHardDec": 0.323, "clearClose": "W", "clearCloseDec": 0.386, "clearFree": "X", "clearFreeDec": 0.397 }, { "size": "3/8-24", "series": "UNF", "major": 0.375, "tpi": 24, "tap": "Q", "tapDec": 0.332, "tapHard": "R", "tapHardDec": 0.339, "clearClose": "W", "clearCloseDec": 0.386, "clearFree": "X", "clearFreeDec": 0.397 }, { "size": "7/16-14", "series": "UNC", "major": 0.4375, "tpi": 14, "tap": "U", "tapDec": 0.368, "tapHard": "V", "tapHardDec": 0.377, "clearClose": "29/64", "clearCloseDec": 0.4531, "clearFree": "15/32", "clearFreeDec": 0.4688 }, { "size": "7/16-20", "series": "UNF", "major": 0.4375, "tpi": 20, "tap": "25/64", "tapDec": 0.3906, "tapHard": "X", "tapHardDec": 0.397, "clearClose": "29/64", "clearCloseDec": 0.4531, "clearFree": "15/32", "clearFreeDec": 0.4688 }, { "size": "1/2-13", "series": "UNC", "major": 0.5, "tpi": 13, "tap": "27/64", "tapDec": 0.4219, "tapHard": "7/16", "tapHardDec": 0.4375, "clearClose": "33/64", "clearCloseDec": 0.5156, "clearFree": "17/32", "clearFreeDec": 0.5312 }, { "size": "1/2-20", "series": "UNF", "major": 0.5, "tpi": 20, "tap": "29/64", "tapDec": 0.4531, "tapHard": "29/64", "tapHardDec": 0.4531, "clearClose": "33/64", "clearCloseDec": 0.5156, "clearFree": "17/32", "clearFreeDec": 0.5312 } ] } }, { "slug": "decimal-equivalents", "title": "Drill Decimal Equivalents", "description": "Fraction (1/64–1 in), number (#80–#1) and letter (A–Z) drill sizes with decimal inch and millimetre equivalents.", "pageUrl": "https://lavignelabs.net/tools/charts/decimal-equivalents/", "pdfA4Url": "https://lavignelabs.net/tools/charts/decimal-equivalents-a4.pdf", "pdfLetterUrl": "https://lavignelabs.net/tools/charts/decimal-equivalents-letter.pdf", "jsonUrl": "https://lavignelabs.net/api/v1/charts/decimal-equivalents.json", "data": { "units": "inch and mm", "fractions": [ { "frac": "1/64", "in": 0.015625, "mm": 0.397 }, { "frac": "1/32", "in": 0.03125, "mm": 0.794 }, { "frac": "3/64", "in": 0.046875, "mm": 1.191 }, { "frac": "1/16", "in": 0.0625, "mm": 1.587 }, { "frac": "5/64", "in": 0.078125, "mm": 1.984 }, { "frac": "3/32", "in": 0.09375, "mm": 2.381 }, { "frac": "7/64", "in": 0.109375, "mm": 2.778 }, { "frac": "1/8", "in": 0.125, "mm": 3.175 }, { "frac": "9/64", "in": 0.140625, "mm": 3.572 }, { "frac": "5/32", "in": 0.15625, "mm": 3.969 }, { "frac": "11/64", "in": 0.171875, "mm": 4.366 }, { "frac": "3/16", "in": 0.1875, "mm": 4.762 }, { "frac": "13/64", "in": 0.203125, "mm": 5.159 }, { "frac": "7/32", "in": 0.21875, "mm": 5.556 }, { "frac": "15/64", "in": 0.234375, "mm": 5.953 }, { "frac": "1/4", "in": 0.25, "mm": 6.35 }, { "frac": "17/64", "in": 0.265625, "mm": 6.747 }, { "frac": "9/32", "in": 0.28125, "mm": 7.144 }, { "frac": "19/64", "in": 0.296875, "mm": 7.541 }, { "frac": "5/16", "in": 0.3125, "mm": 7.938 }, { "frac": "21/64", "in": 0.328125, 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