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Model Scale Charts - Actual Sizes in Standard Drill Sizes

Contributed by: wirewolf on 03-22-2004


Actual Sizes in Standard Drill Sizes

Actual
Size
Actual
Decimal
Size
(in.)
Scale
1/12"=1'
(1:144)
(in.)
Scale
1/10"=1'
(1:120)
(in.)
Scale
1/8"=1"
(1:96)
(in.)
Scale
1/6"=1'
(1:72)
(in.)
Scale
1/4"=1'
(1:48)
(in.)
Scale
3/8"=1'
(1:32)
(in.)
Scale
1/2"=1'
(1:24)
(in.)
Scale
3/4"=1'
(1:16)
(in.)
Scale
1"=1'
(1:12)
(in.)
Scale
2"=1'
(1:6)
(in.)
1
0.2280
32.832
27.36
21.888
16.416
10.944
7.296
5.472
3.648
2.736
1.368
2
0.2210
31.824
26.52
21.216
15.912
10.608
7.072
5.304
3.536
2.652
1.326
3
0.2130
30.672
25.56
20.448
15.336
10.224
6.816
5.112
3.408
2.556
1.278
4
0.2090
30.096
25.08
20.064
15.048
10.032
6.688
5.016
3.344
2.508
1.254
5
0.2055
29.592
24.66
19.728
14.796
9.864
6.576
4.932
3.288
2.466
1.233
6
0.2040
29.376
24.48
19.584
14.688
9.792
6.528
4.896
3.264
2.448
1.224
7
0.2010
28.944
24.12
19.296
14.472
9.648
6.432
4.824
3.216
2.412
1.206
8
0.1990
28.656
23.88
19.104
14.328
9.552
6.368
4.776
3.184
2.388
1.194
9
0.1960
28.224
23.52
18.816
14.112
9.408
6.272
4.704
3.136
2.352
1.176
10
0.1935
27.864
23.22
18.576
13.932
9.288
6.192
4.644
3.096
2.322
1.161
11
0.1910
27.504
22.92
18.336
13.752
9.168
6.112
4.584
3.056
2.292
1.146
12
0.1890
27.216
22.68
18.144
13.608
9.072
6.048
4.536
3.024
2.268
1.134
13
0.1850
26.64
22.2
17.76
13.32
8.88
5.92
4.44
2.96
2.22
1.11
14
0.1820
26.208
21.84
17.472
13.104
8.736
5.824
4.368
2.912
2.184
1.092
15
0.1800
25.92
21.6
17.28
12.96
8.64
5.76
4.32
2.88
2.16
1.08
16
0.1770
25.488
21.24
16.992
12.744
8.496
5.664
4.248
2.832
2.124
1.062
17
0.1730
24.912
20.76
16.608
12.456
8.304
5.536
4.152
2.768
2.076
1.038
18
0.1695
24.408
20.34
16.272
12.204
8.136
5.424
4.068
2.712
2.034
1.017
19
0.1660
23.904
19.92
15.936
11.952
7.968
5.312
3.984
2.656
1.992
0.996
20
0.1610
23.184
19.32
15.456
11.592
7.728
5.152
3.864
2.576
1.932
0.966
21
0.1590
22.896
19.08
15.264
11.448
7.632
5.088
3.816
2.544
1.908
0.954
22
0.1570
22.608
18.84
15.072
11.304
7.536
5.024
3.768
2.512
1.884
0.942
23
0.1540
22.176
18.48
14.784
11.088
7.392
4.928
3.696
2.464
1.848
0.924
24
0.1520
21.888
18.24
14.592
10.944
7.296
4.864
3.648
2.432
1.824
0.912
25
0.1495
21.528
17.94
14.352
10.764
7.176
4.784
3.588
2.392
1.794
0.897
26
0.1470
21.168
17.64
14.112
10.584
7.056
4.704
3.528
2.352
1.764
0.882
27
0.1440
20.736
17.28
13.824
10.368
6.912
4.608
3.456
2.304
1.728
0.864
28
0.1405
20.232
16.86
13.488
10.116
6.744
4.496
3.372
2.248
1.686
0.843
29
0.1360
19.584
16.32
13.056
9.792
6.528
4.352
3.264
2.176
1.632
0.816
30
0.1285
18.504
15.42
12.336
9.252
6.168
4.112
3.084
2.056
1.542
0.771
31
0.1200
17.28
14.4
11.52
8.64
5.76
3.84
2.88
1.92
1.44
0.72
32
0.1160
16.704
13.92
11.136
8.352
5.568
3.712
2.784
1.856
1.392
0.696
33
0.1130
16.272
13.56
10.848
8.136
5.424
3.616
2.712
1.808
1.356
0.678
34
0.1110
15.984
13.32
10.656
7.992
5.328
3.552
2.664
1.776
1.332
0.666
35
0.1100
15.84
13.2
10.56
7.92
5.28
3.52
2.64
1.76
1.32
0.66
36
0.1065
15.336
12.78
10.224
7.668
5.112
3.408
2.556
1.704
1.278
0.639
37
0.1040
14.976
12.48
9.984
7.488
4.992
3.328
2.496
1.664
1.248
0.624
38
0.1015
14.616
12.18
9.744
7.308
4.872
3.248
2.436
1.624
1.218
0.609
39
0.0995
14.328
11.94
9.552
7.164
4.776
3.184
2.388
1.592
1.194
0.597
40
0.0980
14.112
11.76
9.408
7.056
4.704
3.136
2.352
1.568
1.176
0.588
41
0.0960
13.824
11.52
9.216
6.912
4.608
3.072
2.304
1.536
1.152
0.576
42
0.0935
13.464
11.22
8.976
6.732
4.488
2.992
2.244
1.496
1.122
0.561
43
0.0890
12.816
10.68
8.544
6.408
4.272
2.848
2.136
1.424
1.068
0.534
44
0.0860
12.384
10.32
8.256
6.192
4.128
2.752
2.064
1.376
1.032
0.516
45
0.0820
11.808
9.84
7.872
5.904
3.936
2.624
1.968
1.312
0.984
0.492
46
0.0810
11.664
9.72
7.776
5.832
3.888
2.592
1.944
1.296
0.972
0.486
47
0.0785
11.304
9.42
7.536
5.652
3.768
2.512
1.884
1.256
0.942
0.471
48
0.0760
10.944
9.12
7.296
5.472
3.648
2.432
1.824
1.216
0.912
0.456
49
0.0730
10.512
8.76
7.008
5.256
3.504
2.336
1.752
1.168
0.876
0.438
50
0.0700
10.08
8.4
6.72
5.04
3.36
2.24
1.68
1.12
0.84
0.42
51
0.0670
9.648
8.04
6.432
4.824
3.216
2.144
1.608
1.072
0.804
0.402
52
0.0635
9.144
7.62
6.096
4.572
3.048
2.032
1.524
1.016
0.762
0.381
53
0.0595
8.568
7.14
5.712
4.284
2.856
1.904
1.428
0.952
0.714
0.357
54
0.0550
7.92
6.6
5.28
3.96
2.64
1.76
1.32
0.88
0.66
0.33
55
0.0520
7.488
6.24
4.992
3.744
2.496
1.664
1.248
0.832
0.624
0.312
56
0.0465
6.696
5.58
4.464
3.348
2.232
1.488
1.116
0.744
0.558
0.279
57
0.0430
6.192
5.16
4.128
3.096
2.064
1.376
1.032
0.688
0.516
0.258
58
0.0420
6.048
5.04
4.032
3.024
2.016
1.344
1.008
0.672
0.504
0.252
59
0.0410
5.904
4.92
3.936
2.952
1.968
1.312
0.984
0.656
0.492
0.246
60
0.0400
5.76
4.8
3.84
2.88
1.92
1.28
0.96
0.64
0.48
0.24
61
0.0390
5.616
4.68
3.744
2.808
1.872
1.248
0.936
0.624
0.468
0.234
62
0.0380
5.472
4.56
3.648
2.736
1.824
1.216
0.912
0.608
0.456
0.228
63
0.0370
5.328
4.44
3.552
2.664
1.776
1.184
0.888
0.592
0.444
0.222
64
0.0360
5.184
4.32
3.456
2.592
1.728
1.152
0.864
0.576
0.432
0.216
65
0.0350
5.04
4.2
3.36
2.52
1.68
1.12
0.84
0.56
0.42
0.21
66
0.0330
4.752
3.96
3.168
2.376
1.584
1.056
0.792
0.528
0.396
0.198
67
0.0320
4.608
3.84
3.072
2.304
1.536
1.024
0.768
0.512
0.384
0.192
68
0.0310
4.464
3.72
2.976
2.232
1.488
0.992
0.744
0.496
0.372
0.186
69
0.0292
4.205
3.504
2.803
2.102
1.402
0.934
0.701
0.467
0.35
0.175
70
0.0280
4.032
3.36
2.688
2.016
1.344
0.896
0.672
0.448
0.336
0.168
71
0.0260
3.744
3.12
2.496
1.872
1.248
0.832
0.624
0.416
0.312
0.156
72
0.0250
3.6
3
2.4
1.8
1.2
0.8
0.6
0.4
0.3
0.15
73
0.0240
3.456
2.88
2.304
1.728
1.152
0.768
0.576
0.384
0.288
0.144
74
0.0225
3.24
2.7
2.16
1.62
1.08
0.72
0.54
0.36
0.27
0.135
75
0.0210
3.024
2.52
2.016
1.512
1.008
0.672
0.504
0.336
0.252
0.126
76
0.0200
2.88
2.4
1.92
1.44
0.96
0.64
0.48
0.32
0.24
0.12
77
0.0180
2.592
2.16
1.728
1.296
0.864
0.576
0.432
0.288
0.216
0.108
78
0.0160
2.304
1.92
1.536
1.152
0.768
0.512
0.384
0.256
0.192
0.096
79
0.0145
2.088
1.74
1.392
1.044
0.696
0.464
0.348
0.232
0.174
0.087
80
0.0135
1.944
1.62
1.296
0.972
0.648
0.432
0.324
0.216
0.162
0.081
81
0.0130
1.872
1.56
1.248
0.936
0.624
0.416
0.312
0.208
0.156
0.078
82
0.0125
1.8
1.5
1.2
0.9
0.6
0.4
0.3
0.2
0.15
0.075
83
0.0120
1.728
1.44
1.152
0.864
0.576
0.384
0.288
0.192
0.144
0.072
84
0.0115
1.656
1.38
1.104
0.828
0.552
0.368
0.276
0.184
0.138
0.069
85
0.0110
1.584
1.32
1.056
0.792
0.528
0.352
0.264
0.176
0.132
0.066
86
0.0105
1.512
1.26
1.008
0.756
0.504
0.336
0.252
0.168
0.126
0.063
87
0.0100
1.44
1.2
0.96
0.72
0.48
0.32
0.24
0.16
0.12
0.06
88
0.0095
1.368
1.14
0.912
0.684
0.456
0.304
0.228
0.152
0.114
0.057
89
0.0091
1.31
1.092
0.874
0.655
0.437
0.291
0.218
0.146
0.109
0.055
90
0.0087
1.253
1.044
0.835
0.626
0.418
0.278
0.209
0.139
0.104
0.052
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