Inch and Metric Drill Bit Size Chart
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Machinist Drill Bit Size Table | Drill Bit Size Chart | ISO Metric Drill Bit Size Table
ANSI and ISO Twist drill size chart Fractional and Metric Sizes per. ANSI/ASME B94.11M-1993 below are the standard size drill bits used and readily available in industry. Fractional sizes are measured in inches, while metric sizes are measured in millimeters. The drill size chart contains twist drill data for up to 1.0 inches in diameter.
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 |
|
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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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