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| ANSI Size Drills | ISO (Metric Size Drills) and Conversion to Inches |
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| Drill(in.) | Decimal | Drill(in.) | Decimal | Drill(in.) | Decimal | Drill(mm) | Decimal(in.) | Drill (mm) |
Decimal(in.) | Drill(mm) | Decimal(in.) | |
| 80 | .0135 | 1/8 | .1250 | O | .3160 | .35 | .0138 | 3.4 | .1339 | 8.0 | .3150 | |
| 79 | .0145 | 30 | .1285 | P | .3230 | .4 | .0157 | 3.5 | .1378 | 8.1 | .3189 | |
| 1/64 | .0156 | 29 | .1360 | 21/64 | .3281 | .45 | .0177 | 3.6 | .1417 | 8.2 | .3228 | |
| 78 | .0160 | 28 | .1405 | Q | .3320 | .5 | .0197 | 3.7 | .1457 | 8.25 | .3248 | |
| 77 | .0180 | 9/64 | .1406 | R | .3390 | .55 | .0217 | 3.75 | .1477 | 8.3 | .3267 | |
| 76 | .0200 | 27 | .1440 | 11/32 | .3437 | .6 | .0236 | 3.8 | .1496 | 8.4 | .3307 | |
| 75 | .0210 | 26 | .1470 | S | .3480 | .65 | .0256 | 3.9 | .1535 | 8.5 | .3346 | |
| 74 | .0225 | 25 | .1495 | T | .3580 | .7 | .0276 | 4.0 | .1575 | 8.6 | .3386 | |
| 73 | .0240 | 24 | .1520 | 23/64 | .3594 | .75 | .0295 | 4.1 | .1614 | 8.7 | .3425 | |
| 72 | .0250 | 23 | .1540 | U | .3680 | .8 | .0315 | 4.2 | .1654 | 8.75 | .3445 | |
| 71 | .0260 | 5/32 | .1562 | 3/8 | .3750 | .85 | .0335 | 4.25 | .1674 | 8.8 | .3465 | |
| 70 | .0280 | 22 | .1570 | V | .3770 | .9 | .0355 |
4.3 | .1693 | 8.9 | .3504 | |
| 69 | .0292 | 21 | .1590 | W | .3860 | .95 | .0374 | 4.4 | .1732 | 9.0 | .3543 | |
| 68 | .0310 | 20 | .1610 | 25/64 | .3906 | 1.0 | .0394 | 4.5 | .1771 | 9.1 | .3583 | |
| 1/32 | .0313 | 19 | .1660 | X | .3970 | 1.05 | .0413 | 4.6 | .1811 | 9.2 | .3622 | |
| 67 | .0320 | 18 | .1695 | Y | .4040 | 1.1 | .0433 | 4.7 | .1850 | 9.25 | .3642 | |
| 66 | .0330 | 11/64 | .1719 | 13/32 | .4062 | 1.15 | .0453 | 4.75 | .1870 | 9.35 | .3661 | |
| 65 | .0350 | 17 | .1730 | Z | .4130 | 1.2 | .0472 | 4.8 | .1890 | 9.4 | .3701 | |
| 64 | .0360 | 16 | .1770 | 27/64 | .4219 | 1.25 | .0492 | 4.9 | .1929 | 9.5 | .3740 | |
| 63 | .0370 | 15 | .1800 | 7/16 | .4375 | 1.3 | .0512 | 5.0 | .1968 | 9.6 | .3780 | |
| 62 | .0380 | 14 | .1820 | 29/64 | .4531 | 1.35 | .0531 | 5.1 | .2008 | 9.7 | .3819 | |
| 61 | .0390 | 13 | .1850 | 15/32 | .4687 | 1.4 | .0551 | 5.2 | .2047 | 9.75 | .3839 | |
| 60 | .0400 | 3/16 | .1875 | 31/64 | .4844 | 1.45 | .0571 | 5.25 | .2067 | 9.8 | .3858 | |
| 59 | .0410 | 12 | .1890 | ½ | .5000 | 1.5 | .0591 | 5.3 | .2087 | 9.9 | .3898 | |
| 58 | .0420 | 11 | .1910 | 33/64 | .5156 | 1.55 | .0610 | 5.4 | .2126 | 10.0 | .3937 | |
| 57 | .0430 | 10 | .1935 | 17/32 | .5312 | 1.6 | .0629 | 5.5 | .2165 | 10.5 | .4133 | |
| 56 | .0465 | 9 | .1960 | 35/64 | .5469 | 1.65 | .0650 | 5.6 | .2205 | 11.0 | .4331 | |
| 3/64 | .0469 | 8 | .1990 | 9/16 | .5625 | 1.7 | .0669 | 5.7 | .2244 | 11.5 | .4528 | |
| 55 | .0520 | 7 | .2010 | 37/64 | .5781 | 1.75 | .0689 | 5.75 | .2264 | 12.0 | .4724 | |
| 54 | .0550 | 13/64 | .2031 | 19/32 | .5937 | 1.8 | .0709 | 5.8 | .2283 | 12.5 | .4921 | |
| 53 | .0595 | 6 | .2040 | 39/64 | .6094 | 1.85 | .0728 | 5.9 | .2323 | 13.0 | .5118 | |
| 1/16 | .0625 | 5 | .2055 | 5/8 | .6250 | 1.9 | .0748 | 6.0 | .2362 | 13.5 | .5315 | |
| 52 | .0635 | 4 | .2090 | 41/64 | .6406 | 1.95 | .0768 | 6.1 | .2401 | 14.0 | .5512 | |
| 51 | .0670 | 3 | .2130 | 21/32 | .6562 | 2.0 | .0787 | 6.2 | .2441 | 14.5 | .5708 | |
| 50 | .0700 | 7/32 | .2187 | 43/64 | .6719 | 2.05 | .0807 | 6.25 | .2461 | 15.0 | .5906 | |
| 49 | .0730 | 2 | .2210 | 11/16 | .6875 | 2.1 | .0827 | 6.3 | .2480 | 15.5 | .6102 | |
| 48 | .0760 | 1 | .2280 | 45/64 | .7031 | 2.15 | .0846 | 6.4 | .2520 | 16.0 | .6300 | |
| 5/64 | .0781 | A | .2340 | 23/32 | .7187 | 2.2 | .0866 | 6.5 | .2559 | 16.5 | .6496 | |
| 47 | .0785 | 15/64 | .2344 | 47/64 | .7344 | 2.25 | .0886 | 6.6 | .2598 | 17.0 | .6693 | |
| 46 | .0810 | B | .2380 | ¾ | .7500 | 2.3 | .0905 | 6.7 | .2638 | 17.5 | .6889 | |
| 45 | .0820 | C | .2420 | 49/64 | .7656 | 2.35 | .0925 | 6.75 | .2658 | 18.0 | .7087 | |
| 44 | .0860 | D | .2460 | 25/32 | .7812 | 2.4 | .0945 | 6.8 | .2677 | 18.5 | .7283 | |
| 43 | .0890 | E | .2500 | 51/64 | .7969 | 2.45 | .0965 | 6.9 | .2716 | 19.0 | .7480 | |
| 42 | .0935 | ¼ | .2500 | 13/16 | .8125 | 2.5 | .0984 | 7.0 | .2756 | 19.5 | .7677 | |
| 3/32 | .0937 | F | .2570 | 53/64 | .8281 | 2.55 | .1004 | 7.1 | .2795 | 20.0 | .7874 | |
| 41 | .0960 | G | .2610 | 27/32 | .8437 | 2.6 | .1024 | 7.2 | .2835 | 20.5 | .8071 | |
| 40 | .0980 | 17/64 | .2656 | 55/64 | .8594 | 2.65 | .1043 | 7.25 | .2855 | 21.0 | .8268 | |
| 39 | .0995 | H | .2660 | 7/8 | .8750 | 2.7 | .1063 | 7.3 | .2874 | 21.5 | .8465 | |
| 38 | .1015 | I | .2720 | 57/64 | .8906 | 2.75 | .1083 | 7.4 | .2913 | 22.0 | .8661 | |
| 37 | .1040 | J | .2770 | 29/32 | .9062 | 2.8 | .1102 | 7.5 | .2953 | 22.5 | .8858 | |
| 36 | .1065 | K | .2811 | 59/64 | .9219 | 2.9 | .1142 | 7.6 | .2990 | 23.0 | .9055 | |
| 7/64 | .1093 | 9/32 | .2812 | 15/16 | .9375 | 3.0 | .1181 | 7.7 | .3031 | 23.5 | .9252 | |
| 35 | .1100 | L | .2900 | 61/64 | .9531 | 3.1 | .1220 | 7.75 | .3051 | 24.0 | .9449 | |
| 34 | .1110 | M | .2950 | 31/32 | .9687 | 3.2 | .1260 | 7.8 | .3071 | 24.5 | .9646 | |
| 33 | .1130 | 19/64 | .2968 | 63/64 | .9844 | 3.25 | .1280 | 7.9 | .3110 | 25.0 | .9843 | |
| 32 | .1160 | N | .3020 | 1 | 1.000 | 3.3 | .1299 | |||||
| 31 | .1200 | 5/16 | .3125 | |||||||||
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HOLE DIAMETER TOLERANCE-STANDARD |
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| These size and tolerance are for holes drilled with a drilling machine using suitable jigs and fixtures. The hole tolerances depend upon the diameter of the hole and increase as the hole size increases. The following are standard tolerances for general machine work and apply in all cases except where greater or lesser accuracy is required by the design. |
Drilled Hole Size | Tolerance |
| .0135 THRU .125 | +.004/ -.001 | |
| .1260 THRU .250 | +.005/ -.001 | |
| .2510 THRU .500 | +.006/-.001 | |
| .5010 THRU .750 | +.008/ -.001 | |
| .7510 THRU 1.000 | +.010/ -.001 | |
| 1 .001 THRU 2.000 | +.012/ -.001 | |