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Engineering Slide Chart ANSI Drill Sizes & Hardware Selector

Machinist Drill Bit Size Table | Drill Bit Size Chart | ISO Metric Drill Bit Size Table

For typical mechanical tolerances that are achievable see: Drilling Tolerances Capabilities Chart

ANSI Size Drill Bit Chart ISO (Metric Size Drills) & Conversion to Inches
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 1/2 .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 3/4 .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 1/4 .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

Fractional and Metric Sizes per. ANSI/ASME B94.11M-1993

Drill Bits, also called Twist drills are available with straight or tapered shanks though the most common drill bits will have straight shanks.

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This page was last revised May 14, 2017 by John A. Tuttle, who Assumes No Liability
For The Accuracy or Validity of the Statements and/or Opinions
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