Drill Size Chart
| Drill |
Inches |
Drill |
Inches |
Drill |
Inches |
mm |
Inches |
mm |
Inches |
mm |
Inches |
| 80 |
.0135 |
1/8 |
.1250 |
O |
.3160 |
.35 |
.0138 |
3.4 |
.1339 |
8.0 |
.3160 |
| 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 |
.4843 |
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 |
| .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 |
.2S20 |
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 |
.299 |
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 |
14 |
.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 |
|
|
|
|
|
|
|
|
HOLE DIA TOLERANCE-STANDARD DRILLED HOLE TOLERANCES .0135 THRU .125 +.004/ -.001
FOR HOLES DRILLED WITH A DRILLING .1260 THRU .25 +.005/ -.001
MACHINE USING SUITABLE JIGS AND .2510 THRU .500 +.006/-.001
FIXTURES, THE HOLE TOLERANCES DE- .5010 THRU .750 +.008/ -.001
PEND UPON THE DIAMETER OF THE HOLE .7510 THRU 1.000 +.010/ -.001
AND INCREASE AS THE HOLE DIAMETER 1.001 THRU 2.000 +.012/ -.001
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.