Drill Bit Size Conversions
Fract.
(in) |
Decimal
(in) |
Wire No.
/Letter |
Metric
(mm) |
|
Fract.
(in) |
Decimal
(in) |
Wire No.
/Letter |
Metric
(mm) |
|
Fract.
(in) |
Decimal
(in) |
Wire No.
/Letter |
Metric
(mm) |
|
|
0.0098 |
|
0.25 |
|
0.1065 |
36 |
|
|
0.3480 |
S |
|
|
0.0118 |
|
0.30 |
7/64 |
0.1094 |
|
|
|
0.3543 |
|
9.00 |
|
0.0135 |
80 |
|
|
0.1100 |
35 |
|
|
0.3580 |
T |
|
|
0.0138 |
|
0.35 |
|
0.1102 |
|
2.80 |
23/64 |
0.3594 |
|
|
|
0.0145 |
79 |
|
|
0.1110 |
34 |
|
|
0.3680 |
U |
|
1/64 |
0.0156 |
|
|
|
0.1130 |
33 |
|
|
0.3740 |
|
9.50 |
|
0.0157 |
|
0.40 |
|
0.1142 |
|
2.90 |
3/8 |
0.3750 |
|
|
|
0.0160 |
78 |
|
|
0.1160 |
32 |
|
|
0.3770 |
V |
|
|
0.0177 |
|
0.45 |
|
0.1181 |
|
3.00 |
|
0.3860 |
W |
|
|
0.0180 |
77 |
|
|
0.1200 |
31 |
|
25/64 |
0.3906 |
|
|
|
0.0197 |
|
0.50 |
1/8 |
0.1250 |
|
|
|
0.3937 |
|
10.00 |
|
0.0200 |
76 |
|
|
0.1285 |
30 |
|
|
0.3970 |
X |
|
|
0.0210 |
75 |
|
|
0.1360 |
29 |
|
|
0.4040 |
Y |
|
|
0.0217 |
|
0.55 |
|
0.1378 |
|
3.50 |
13/32 |
0.4063 |
|
|
|
0.0225 |
74 |
|
|
0.1405 |
28 |
|
|
0.4130 |
Z |
|
|
0.0236 |
|
0.60 |
9/64 |
0.1406 |
|
|
|
0.4134 |
|
10.50 |
|
0.0240 |
73 |
|
|
0.1440 |
27 |
|
27/64 |
0.4219 |
|
|
|
0.0250 |
72 |
|
|
0.1470 |
26 |
|
|
0.4331 |
|
11.00 |
|
0.0256 |
|
0.65 |
|
0.1495 |
25 |
|
7/16 |
0.4375 |
|
|
|
0.0260 |
71 |
|
|
0.1520 |
24 |
|
|
0.4528 |
|
11.50 |
|
0.0276 |
|
0.70 |
|
0.1540 |
23 |
|
29/64 |
0.4531 |
|
|
|
0.0280 |
70 |
|
5/32 |
0.1563 |
|
|
15/32 |
0.4688 |
|
|
|
0.0292 |
69 |
|
|
0.1570 |
22 |
|
|
0.4724 |
|
12.00 |
|
0.0295 |
|
0.75 |
|
0.1575 |
|
4.00 |
31/64 |
0.4844 |
|
|
|
0.0310 |
68 |
|
|
0.1590 |
21 |
|
|
0.4921 |
|
12.50 |
1/32 |
0.0313 |
|
|
|
0.1610 |
20 |
|
1/2 |
0.5000 |
|
|
|
0.0315 |
|
0.80 |
|
0.1660 |
19 |
|
|
0.5118 |
|
13.00 |
|
0.0320 |
67 |
|
|
0.1695 |
18 |
|
33/64 |
0.5156 |
|
|
|
0.0330 |
66 |
|
11/64 |
0.1719 |
|
|
17/32 |
0.5313 |
|
|
|
0.0335 |
|
0.85 |
|
0.1730 |
17 |
|
|
0.5315 |
|
13.50 |
|
0.0350 |
65 |
|
|
0.1770 |
16 |
|
35/64 |
0.5469 |
|
|
|
0.0354 |
|
0.90 |
|
0.1772 |
|
4.50 |
|
0.5512 |
|
14.00 |
|
0.0360 |
64 |
|
|
0.1800 |
15 |
|
9/16 |
0.5625 |
|
|
|
0.0370 |
63 |
|
|
0.1820 |
14 |
|
|
0.5709 |
|
14.50 |
|
0.0374 |
|
0.95 |
|
0.1850 |
13 |
|
37/64 |
0.5781 |
|
|
|
0.0380 |
62 |
|
3/16 |
0.1875 |
|
|
|
0.5905 |
|
15.00 |
|
0.0390 |
61 |
|
|
0.1890 |
12 |
|
19/32 |
0.5938 |
|
|
|
0.0394 |
|
1.00 |
|
0.1910 |
11 |
|
39/64 |
0.6094 |
|
|
|
0.0400 |
60 |
|
|
0.1935 |
10 |
|
|
0.6102 |
|
15.50 |
|
0.0410 |
59 |
|
|
0.1960 |
9 |
|
5/8 |
0.6250 |
|
|
|
0.0420 |
58 |
|
|
0.1968 |
|
5.00 |
|
0.6299 |
|
16.00 |
|
0.0430 |
57 |
|
|
0.1990 |
8 |
|
41/64 |
0.6406 |
|
|
|
0.0433 |
|
1.10 |
|
0.2010 |
7 |
|
|
0.6496 |
|
16.50 |
|
0.0465 |
56 |
|
13/64 |
0.2031 |
|
|
21/32 |
0.6563 |
|
|
3/64 |
0.0469 |
|
|
|
0.2040 |
6 |
|
|
0.6693 |
|
17.00 |
|
0.0472 |
|
1.20 |
|
0.2055 |
5 |
|
43/64 |
0.6719 |
|
|
|
0.0512 |
|
1.30 |
|
0.2090 |
4 |
|
11/16 |
0.6875 |
|
|
|
0.0520 |
55 |
|
|
0.2130 |
3 |
|
|
0.6890 |
|
17.50 |
|
0.0550 |
54 |
|
|
0.2165 |
|
5.50 |
45/64 |
0.7031 |
|
|
|
0.0551 |
|
1.40 |
7/32 |
0.2188 |
|
|
|
0.7087 |
|
18.00 |
|
0.0591 |
|
1.50 |
|
0.2210 |
2 |
|
23/32 |
0.7188 |
|
|
|
0.0595 |
53 |
|
|
0.2280 |
1 |
|
|
0.7283 |
|
18.50 |
1/16 |
0.0625 |
|
|
|
0.2340 |
A |
|
47/64 |
0.7344 |
|
|
|
0.0630 |
|
1.60 |
15/64 |
0.2344 |
|
|
|
0.7480 |
|
19.00 |
|
0.0635 |
52 |
|
|
0.2362 |
|
6.00 |
3/4 |
0.7500 |
|
|
|
0.0669 |
|
1.70 |
|
0.2380 |
B |
|
49/64 |
0.7656 |
|
|
|
0.0670 |
51 |
|
|
0.2420 |
C |
|
|
0.7677 |
|
19.50 |
|
0.0700 |
50 |
|
|
0.2460 |
D |
|
25/32 |
0.7813 |
|
|
|
0.0709 |
|
1.80 |
1/4 |
0.2500 |
E |
|
|
0.7874 |
|
20.00 |
|
0.0730 |
49 |
|
|
0.2559 |
|
6.50 |
51/64 |
0.7969 |
|
|
|
0.0748 |
|
1.90 |
|
0.2570 |
F |
|
|
0.8071 |
|
20.50 |
|
0.0760 |
48 |
|
|
0.2610 |
G |
|
13/16 |
0.8125 |
|
|
5/64 |
0.0781 |
|
|
17/64 |
0.2656 |
|
|
|
0.8268 |
|
21.00 |
|
0.0785 |
47 |
|
|
0.2660 |
H |
|
53/64 |
0.8281 |
|
|
|
0.0787 |
|
2.00 |
|
0.2720 |
I |
|
27/32 |
0.8438 |
|
|
|
0.0810 |
46 |
|
|
0.2756 |
|
7.00 |
|
0.8465 |
|
21.50 |
|
0.0820 |
45 |
|
|
0.2770 |
J |
|
55/64 |
0.8594 |
|
|
|
0.0827 |
|
2.10 |
|
0.2810 |
K |
|
|
0.8661 |
|
22.00 |
|
0.0860 |
44 |
|
9/32 |
0.2813 |
|
|
7/8 |
0.8750 |
|
|
|
0.0866 |
|
2.20 |
|
0.2900 |
L |
|
|
0.8858 |
|
22.50 |
|
0.0890 |
43 |
|
|
0.2950 |
M |
|
57/64 |
0.8906 |
|
|
|
0.0906 |
|
2.30 |
|
0.2953 |
|
7.50 |
|
0.9055 |
|
23.00 |
|
0.0935 |
42 |
|
19/64 |
0.2969 |
|
|
29/32 |
0.9063 |
|
|
3/32 |
0.0938 |
|
|
|
0.3020 |
N |
|
59/64 |
0.9219 |
|
|
|
0.0945 |
|
2.40 |
5/16 |
0.3125 |
|
|
|
0.9252 |
|
23.50 |
|
0.0960 |
41 |
|
|
0.3150 |
|
8.00 |
15/16 |
0.9375 |
|
|
|
0.0980 |
40 |
|
|
0.3160 |
O |
|
|
0.9449 |
|
24.00 |
|
0.0984 |
|
2.50 |
|
0.3230 |
P |
|
61/64 |
0.9531 |
|
|
|
0.0995 |
39 |
|
21/64 |
0.3281 |
|
|
|
0.9646 |
|
24.50 |
|
0.1015 |
38 |
|
|
0.3320 |
Q |
|
31/32 |
0.9688 |
|
|
|
0.1024 |
|
2.60 |
|
0.3346 |
|
8.50 |
|
0.9842 |
|
25.00 |
|
0.1040 |
37 |
|
|
0.3390 |
R |
|
63/64 |
0.9844 |
|
|
|
0.1063 |
|
2.70 |
11/32 |
0.3438 |
|
|
1 |
1.0000 |
|
|
|
Fract.
(in) |
Decimal
(in) |
Wire No.
/Letter |
Metric
(mm) |
Fract.
(in) |
Decimal
(in) |
Wire No.
/Letter |
Metric
(mm) |
Fract.
(in) |
Decimal
(in) |
Wire No.
/Letter |
Metric
(mm) |
Note: 1 in = 25.4 mm
source: http://academic.evergreen.edu/projects/biophysics/technotes/fabric/drill_conv.htm