"Drill Bit Conversion Chart - Numbers & Letters"

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Drill Bit Conversion Chart
Numbers & Letters
gauge
inches
mm
gauge
inches
mm
gauge
inches
mm
gauge
inches
mm
80
0.0135
0.343
53
0.0595
1.511
26
0.147
3.734
A
0.234
5.944
79
0.0145
0.368
52
0.0635
1.613
25
0.1495
3.797
B
0.238
6.045
78
0.016
0.406
51
0.067
1.702
24
0.152
3.861
C
0.242
6.147
77
0.018
0.457
50
0.07
1.778
23
0.154
3.912
D
0.246
6.248
76
0.02
0.508
49
0.073
1.854
22
0.157
3.988
E
0.25
6.35
75
0.021
0.533
48
0.076
1.93
21
0.159
4.039
F
0.257
6.528
74
0.0225
0.572
47
0.0785
1.994
20
0.161
4.089
G
0.261
6.629
73
0.024
0.61
46
0.081
2.057
19
0.166
4.216
H
0.266
6.756
72
0.025
0.635
45
0.082
2.083
18
0.1695
4.305
I
0.272
6.909
71
0.026
0.66
44
0.086
2.184
17
0.173
4.394
J
0.277
7.036
70
0.028
0.711
43
0.089
2.261
16
0.177
4.496
K
0.281
7.137
69
0.0292
0.742
42
0.0935
2.375
15
0.18
4.572
L
0.29
7.366
68
0.031
0.787
41
0.096
2.438
14
0.182
4.623
M
0.295
7.493
67
0.032
0.813
40
0.098
2.489
13
0.185
4.699
N
0.302
7.671
66
0.033
0.838
39
0.0995
2.527
12
0.189
4.801
O
0.316
8.026
65
0.035
0.889
38
0.1015
2.578
11
0.191
4.851
P
0.323
8.204
64
0.036
0.914
37
0.104
2.642
10
0.1935
4.915
Q
0.332
8.433
63
0.037
0.94
36
0.1065
2.705
9
0.196
4.978
R
0.339
8.611
62
0.038
0.965
35
0.11
2.794
8
0.199
5.055
S
0.348
8.839
61
0.039
0.991
34
0.111
2.819
7
0.201
5.105
T
0.358
9.093
60
0.04
1.016
33
0.113
2.87
6
0.204
5.182
U
0.368
9.347
59
0.041
1.041
32
0.116
2.946
5
0.2055
5.22
V
0.377
9.576
58
0.042
1.067
31
0.12
3.048
4
0.209
5.309
W
0.386
9.804
57
0.043
1.092
30
0.1285
3.264
3
0.213
5.41
X
0.397
10.08
56
0.0465
1.181
29
0.136
3.454
2
0.221
5.613
Y
0.404
10.26
55
0.052
1.321
28
0.1405
3.569
1
0.228
5.791
Z
0.413
10.49
54
0.055
1.397
27
0.144
3.658
-
-
-
-
-
-
Wire Gauge Drill Size Comparison Chart
Drill Bit Conversion Chart
Numbers & Letters
gauge
inches
mm
gauge
inches
mm
gauge
inches
mm
gauge
inches
mm
80
0.0135
0.343
53
0.0595
1.511
26
0.147
3.734
A
0.234
5.944
79
0.0145
0.368
52
0.0635
1.613
25
0.1495
3.797
B
0.238
6.045
78
0.016
0.406
51
0.067
1.702
24
0.152
3.861
C
0.242
6.147
77
0.018
0.457
50
0.07
1.778
23
0.154
3.912
D
0.246
6.248
76
0.02
0.508
49
0.073
1.854
22
0.157
3.988
E
0.25
6.35
75
0.021
0.533
48
0.076
1.93
21
0.159
4.039
F
0.257
6.528
74
0.0225
0.572
47
0.0785
1.994
20
0.161
4.089
G
0.261
6.629
73
0.024
0.61
46
0.081
2.057
19
0.166
4.216
H
0.266
6.756
72
0.025
0.635
45
0.082
2.083
18
0.1695
4.305
I
0.272
6.909
71
0.026
0.66
44
0.086
2.184
17
0.173
4.394
J
0.277
7.036
70
0.028
0.711
43
0.089
2.261
16
0.177
4.496
K
0.281
7.137
69
0.0292
0.742
42
0.0935
2.375
15
0.18
4.572
L
0.29
7.366
68
0.031
0.787
41
0.096
2.438
14
0.182
4.623
M
0.295
7.493
67
0.032
0.813
40
0.098
2.489
13
0.185
4.699
N
0.302
7.671
66
0.033
0.838
39
0.0995
2.527
12
0.189
4.801
O
0.316
8.026
65
0.035
0.889
38
0.1015
2.578
11
0.191
4.851
P
0.323
8.204
64
0.036
0.914
37
0.104
2.642
10
0.1935
4.915
Q
0.332
8.433
63
0.037
0.94
36
0.1065
2.705
9
0.196
4.978
R
0.339
8.611
62
0.038
0.965
35
0.11
2.794
8
0.199
5.055
S
0.348
8.839
61
0.039
0.991
34
0.111
2.819
7
0.201
5.105
T
0.358
9.093
60
0.04
1.016
33
0.113
2.87
6
0.204
5.182
U
0.368
9.347
59
0.041
1.041
32
0.116
2.946
5
0.2055
5.22
V
0.377
9.576
58
0.042
1.067
31
0.12
3.048
4
0.209
5.309
W
0.386
9.804
57
0.043
1.092
30
0.1285
3.264
3
0.213
5.41
X
0.397
10.08
56
0.0465
1.181
29
0.136
3.454
2
0.221
5.613
Y
0.404
10.26
55
0.052
1.321
28
0.1405
3.569
1
0.228
5.791
Z
0.413
10.49
54
0.055
1.397
27
0.144
3.658
-
-
-
-
-
-
Wire Gauge Drill Size Comparison Chart
Equivalent
Hole
Equivalent
Hole
Equivalent
Hole
Equivalent
Hole
Equivalent
Hole
E
Drill Size
Diameter
Drill Size
Diameter
Drill Size
Diameter
Drill Size
Diameter
Drill Size
Diameter
80
.0550"
54
.1285"
30
.2040"
6
.3281"
21/64"
.6250"
79
.0595"
53
.1360"
29
.2055"
5
.3320"
Q
.6406"
1/64"
.0625"
1/16"
.1405"
28
.2090"
4
.3390"
R
.6562"
78
.0635"
52
.1406"
9/64"
.2130"
3
.3438"
11/32"
.6719"
77
.0670"
51
.1440"
27
.2188"
7/32"
.3480"
S
.6875"
76
.0700"
50
.1470"
26
.2210"
2
.3580"
T
.7031"
75
.0730"
49
.1495"
25
.2280"
1
.3594"
23/64"
.7188"
74
.0760"
48
.1520"
24
.2340"
A
.3680"
U
.7344"
73
.0781"
5/64"
.1540"
23
.2344"
15/64"
.3750"
3/8"
.7500"
72
.0785"
47
.1562"
5/32"
.2380"
B
.3770"
V
.7656"
71
.0810"
46
.1570"
22
.2420"
C
.3860"
W
.7812"
70
.0820"
45
.1590"
21
.2460"
D
.3906"
25/64"
.7969"
69
.0860"
44
.1610"
20
.2500"
1/4"
.3970"
X
.8125"
68
.0890"
43
.1660"
19
.2500"
E
.4040"
Y
.8281"
1/32"
.0935"
42
.1695"
18
.2570"
F
.4062"
13/32"
.8438"
67
.0938"
3/32"
.1719"
11/64"
.2610"
G
.4130"
Z
.8594"
66
.0960"
41
.1730"
17
.2656"
17/64"
.4219"
27/64"
.8750"
65
.0980"
40
.1770"
16
.2660"
H
.4375"
7/16"
.8906"
64
.0995"
39
.1800"
15
.2720"
I
.4531"
29/64"
.9062"
63
.1015"
38
.1820"
14
.2770"
J
.4688"
15/32"
.9219"
62
.1040"
37
.1850"
13
.2810"
K
.4844"
31/64"
.9375"
61
.1065"
36
.1875"
3/16"
.2812"
9/32"
.5000"
1/2"
.9531"
60
.1094"
7/64"
.1890"
12
.2900"
L
.5156"
33/64"
.9688"
59
.1100"
35
.1910"
11
.2950"
M
.5312"
17/32"
.9844"
58
.1110"
34
.1935"
10
.2969"
19/64"
.5469"
35/64"
1.0000"
57
.1130"
33
.1960"
9
.3020"
N
.5625"
9/16"
56
.1160"
32
.1990"
8
.3125"
5/16"
.5781"
37/64"
3/64"
.1200"
31
.2010"
7
.3160"
O
.5938"
19/32"
55
.1250"
1/8"
.2031"
13/64"
.3230"
P
.6094"
39/64"
Metric Drill Size Conversion Chart
Drill
Drill
Drill
Drill
Inch
Inch
Inch
Inch
Size,
Size,
Size,
Size,
Equivalent
Equivalent
Equivalent
Equivalent
mm
mm
mm
mm
1
.0394"
2.7
.1063"
5.9
.2323"
9.1
.3583"
1.05
.0413"
2.8
.1102"
6
.2362"
9.2
.3622"
1.1
.0433"
2.9
.1142"
6.1
.2402"
9.3
.3661"
1.15
.0453"
3
.1181"
6.2
.2441"
9.4
.3701"
1.2
.0472"
3.1
.1220"
6.3
.2480"
9.5
.3740"
1.25
.0492"
3.2
.1260"
6.4
.2520"
9.6
.3780"
1.3
.0512"
3.3
.1299"
6.5
.2559"
9.7
.3819"
1.35
.0531"
3.4
.1339"
6.6
.2598"
9.8
.3858"
1.4
.0551"
3.5
.1378"
6.7
.2638"
9.9
.3898"
1.45
.0571"
3.6
.1417"
6.8
.2677"
10
.3937"
1.5
.0591"
3.7
.1457"
6.9
.2717"
10.2
.4016"
1.55
.0610"
3.8
.1496"
7
.2756"
10.5
.4134"
1.6
.0630"
3.9
.1535"
7.1
.2795"
10.8
.4252"
1.65
.0650"
4
.1575"
7.2
.2835"
11
.4331"
1.7
.0669"
4.1
.1614"
7.3
.2874"
11.2
.4409"
1.75
.0689"
4.2
.1654"
7.4
.2913"
11.5
.4528"
1.8
.0709"
4.3
.1693"
7.5
.2953"
11.8
.4646"
1.85
.0728"
4.4
.1732"
7.6
.2992"
12
.4724"
1.9
.0748"
4.5
.1772"
7.7
.3031"
12.2
.4803"
1.95
.0768"
4.6
.1811"
7.8
.3071"
12.5
.4921"
2
.0787"
4.7
.1850"
7.9
.3110"
13
.5118"
2.05
.0807"
4.8
.1890"
8
.3150"
13.5
.5315"
2.1
.0827"
4.9
.1929"
8.1
.3189"
14
.5512"
2.15
.0846"
5
.1968"
8.2
.3228"
14.5
.5709"
2.2
.0866"
5.1
.2008"
8.3
.3268"
15
.5906"
2.25
.0886"
5.2
.2047"
8.4
.3307"
15.5
.6102"
2.3
.0906"
5.3
.2087"
8.5
.3346"
16
.6299"
2.35
.0925"
5.4
.2126"
8.6
.3386"
16.5
.6496"
2.4
.0945"
5.5
.2165"
8.7
.3425"
17
.6693"
2.45
.0965"
5.6
.2205"
8.8
.3465"
17.5
.6890"
2.5
.0984"
5.7
.2244"
8.9
.3504"
2.6
.1024"
5.8
.2283"
9
.3543"
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