Conversions for fractional, decimal number & letter drill ...
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
Metric
(mm)
0.25
0.3
Fractional
(inch)
7/64
80
0.35
79
0.4
78
0.45
77
0.5
1/8
76
75
0.55
74
0.6
9/64
73
72
0.65
71
0.7
70
69
5/32
0.75
68
0.8
67
66
11/64
0.85
65
0.9
64
63
0.95
62
61
3/16
1
60
59
58
57
1.1
56
13/64
1.2
1.3
55
54
1.4
1.5
7/32
53
1.6
15/64
52
1.7
51
50
1.8
1/4
49
1.9
48
17/64
47
2
46
45
2.1
44
9/32
2.2
43
2.3
42
19/64
2.4
5/16
41
40
2.5
39
38
21/64
2.6
37
2.7
11/32
Decimal
(inch)
Drill
Number
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
36
Metric
(mm)
Fractional
(inch)
35
2.8
23/64
34
33
2.9
3/8
32
3
31
25/64
30
29
3.5
13/32
28
27
26
25
24
23
27/64
7/16
29/64
15/32
22
4
21
20
19
18
31/64
1/2
33/64
17/32
17
16
35/64
4.5
15
14
13
9/16
37/64
12
11
10
9
19/32
39/64
5/8
5
8
7
41/64
21/32
6
5
4
3
43/64
11/16
5.5
2
1
A
45/64
23/32
47/64
6
B
C
D
E
3/4
49/64
25/32
6.5
51/64
F
G
13/16
H
I
53/64
27/32
7
J
K
55/64
7/8
L
M
57/64
7.5
29/32
59/64
N
8
15/16
O
P
61/64
Q
31/32
8.5
R
63/64
1
Decimal
(inch)
Drill
Number
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
S
Metric
(mm)
9
T
U
9.5
V
W
10
X
Y
Z
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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