Conversions for fractional, decimal number & letter drill sizes
Conversions for fractional, decimal number & letter drill
sizes
Contributed by: Wayne Racinowski A.K.A "wracinowski"
This tutorial was downloaded from
The International Association of Penturners
Conversions for Fractional, Decimal, Number & Letter Drill Sizes and Metric
Fractional (inch) 1/64
1/32
3/64 1/16 5/64 3/32
Decimal (inch)
0.0098 0.0118 0.0135 0.0138 0.0145 0.0156 0.0157 0.016 0.0177 0.018 0.0197 0.020 0.021 0.0217 0.0225 0.0236 0.024 0.025 0.0256 0.026 0.0276 0.028 0.0292 0.0295 0.031 0.0313 0.0315 0.032 0.033 0.0335 0.035 0.0354 0.036 0.037 0.0374 0.038 0.039 0.0394 0.040 0.041 0.042 0.043 0.0433 0.0465 0.0469 0.0472 0.0512 0.052 0.055 0.0551 0.0591 0.0595 0.0625 0.063 0.0635 0.0669 0.067 0.070 0.0709 0.073 0.0748 0.076 0.0781 0.0785 0.0787 0.081 0.082 0.0827 0.086 0.0866 0.089 0.0906 0.0935 0.0938 0.0945 0.096 0.098 0.0984 0.0995 0.1015 0.1024 0.104 0.1063
Drill Number
80 79
78 77 76 75 74 73 72 71 70 69 68
67 66 65 64 63 62 61 60 59 58 57 56
55 54
53
52 51 50 49 48 47 46 45 44 43 42
41 40 39 38 37
Metric (mm) 0.25
0.3 0.35
0.4 0.45 0.5
0.55 0.6
0.65 0.7
0.75
0.8
0.85 0.9
0.95
1
1.1
1.2 1.3
1.4 1.5
1.6 1.7
1.8 1.9
2
2.1 2.2 2.3
2.4
2.5
2.6 2.7
Fractional (inch) 7/64
1/8 9/64 5/32
11/64
3/16
13/64 7/32 15/64 1/4 17/64 9/32 19/64 5/16 21/64 11/32
Decimal (inch)
0.1065 0.1094 0.110 0.1102 0.111 0.113 0.1142 0.116 0.1181 0.120 0.125 0.1285 0.136 0.1378 0.1405 0.1406 0.144 0.147 0.1495 0.152 0.154 0.1563 0.157 0.1575 0.159 0.161 0.166 0.1695 0.1719 0.173 0.177 0.1772 0.180 0.182 0.185 0.1875 0.189 0.191 0.1935 0.196 0.1968 0.199 0.201 0.2031 0.204 0.2055 0.209 0.213 0.2165 0.2188 0.221 0.228 0.234 0.2344 0.2362 0.238 0.242 0.246 0.250 0.2559 0.257 0.261 0.2656 0.266 0.272 0.2756 0.277 0.281 0.2813 0.290 0.295 0.2953 0.2969 0.302 0.3125 0.315 0.316 0.323 0.3281 0.332 0.3346 0.339 0.3438
Drill Number
36
35
34 33
32
31
30 29
28
27 26 25 24 23
22
21 20 19 18
17 16
15 14 13
12 11 10 9
8 7
6 5 4 3
2 1 A
B C D E
F G
H I
J K
L M
N
O P
Q
R
Metric (mm)
2.8 2.9
3 3.5
4
4.5
5
5.5 6
6.5 7
7.5 8
8.5
Fractional (inch)
23/64
3/8
25/64
13/32
27/64 7/16
29/64 15/32 31/64
1/2 33/64 17/32 35/64
9/16 37/64 19/32 39/64
5/8 41/64 21/32 43/64 11/16 45/64 23/32 47/64
3/4 49/64 25/32 51/64 13/16 53/64 27/32 55/64
7/8 57/64 29/32 59/64 15/16 61/64 31/32 63/64
1
Decimal (inch)
0.348 0.3543 0.358 0.3594 0.368 0.374 0.375 0.377 0.386 0.3906 0.3937 0.397 0.404 0.4063 0.413 0.4134 0.4219 0.4331 0.4375 0.4528 0.4531 0.4688 0.4724 0.4844 0.4921 0.500 0.5118 0.5156 0.5313 0.5315 0.5469 0.5512 0.5625 0.5709 0.5781 0.5905 0.5938 0.6094 0.6102 0.625 0.6299 0.6406 0.6496 0.6563 0.6693 0.6719 0.6875 0.689 0.7031 0.7087 0.7188 0.7283 0.7344 0.748 0.750 0.7656 0.7677 0.7813 0.7874 0.7969 0.8071 0.8125 0.8268 0.8281 0.8438 0.8465 0.8594 0.8661 0.875 0.8858 0.8906 0.9055 0.9063 0.9219 0.9252 0.9375 0.9449 0.9531 0.9646 0.9688 0.9842 0.9844 1.000
Drill Number
S T U
V W
X Y Z
Metric (mm)
9
9.5
10
10.5 11 11.5
12 12.5 13
13.5 14 14.5 15
15.5 16 16.5 17
17.5 18 18.5 19
19.5 20 20.5 21
21.5 22 22.5 23
23.5 24 24.5 25 25.4
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