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Manufacturing Knowledge Menu
Machine Tool Supply and Services | Tolerance Charts Menu
(See typical tolerances of drilled holes at bottom of
page)
| ANSI Size Drills |
|
ISO (Metric Size Drills) and
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 |
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 |
|
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|
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| 31 |
.1200 |
5/16 |
.3125 |
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HOLE DIAMETER TOLERANCE-STANDARD
DRILLED HOLE TOLERANCES |
| 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 |
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