Engineer's Data Charts
A selection of charts useful to engineers.
Drills Chart
Tapping Drills
Buttons
Forms
Tables
Common Abreviations
Drill Chart
inches
Fraction
Gauge
Metric
mm
0.0004
0.01
0.010
0.0019
107
0.048
0.0020
0.05
0.050
0.0023
106
0.058
0.0027
105
0.069
0.0031
104
0.079
0.0035
103
0.089
0.0039
102
0.099
0.0039
0.10
0.100
0.0043
101
0.109
0.0047
100
0.119
0.0051
99
0.130
0.0055
98
0.140
0.0059
97
0.150
0.0059
0.15
0.150
0.0063
96
0.160
0.0067
95
0.170
0.0071
94
0.180
0.0075
93
0.191
0.0079
0.20
0.200
0.0079
92
0.201
0.0083
91
0.211
0.0087
90
0.221
0.0091
89
0.231
0.0095
88
0.241
0.0098
0.25
0.250
0.0100
87
0.254
0.0105
86
0.267
0.0110
85
0.279
0.0115
84
0.292
0.0118
0.30
0.300
0.0120
83
0.305
0.0125
82
0.318
0.0130
81
0.330
0.0135
80
0.343
0.0145
79
0.368
0.0156
1/64
0.397
0.0157
0.40
0.400
0.0160
78
0.406
0.0180
77
0.457
0.0197
0.50
0.500
0.0200
76
0.508
0.0210
75
0.533
0.0225
74
0.572
0.0236
0.60
0.600
0.0240
73
0.610
0.0250
72
0.635
0.0260
71
0.660
0.0276
0.70
0.700
0.0280
70
0.711
inches
Fraction
Gauge
Metric
mm
0.0292
69
0.742
0.0310
68
0.787
0.0312
1/32
0.794
0.0315
0.80
0.800
0.0320
67
0.813
0.0330
66
0.838
0.0350
65
0.889
0.0354
0.90
0.900
0.0360
64
0.914
0.0370
63
0.940
0.0380
62
0.965
0.0390
61
0.991
0.0394
1.00
1.000
0.0400
60
1.016
0.0410
59
1.041
0.0430
57
1.092
0.0433
1.10
1.100
0.0465
56
1.181
0.0469
3/64
1.191
0.0472
1.20
1.200
0.0512
1.30
1.300
0.0520
55
1.321
0.0550
54
1.397
0.0551
1.40
1.400
0.0591
1.50
1.500
0.0595
53
1.511
0.0625
1/16
1.588
0.0630
1.60
1.600
0.0635
52
1.613
0.0669
1.70
1.700
0.0670
51
1.702
0.0700
50
1.778
0.0709
1.80
1.800
0.0730
49
1.854
0.0748
1.90
1.900
0.0760
48
1.930
0.0781
5/64
1.984
0.0785
47
1.994
0.0787
2.00
2.000
0.0810
46
2.057
0.0827
2.10
2.100
0.0860
44
2.184
0.0866
2.20
2.200
0.0890
43
2.261
0.0906
2.30
2.300
0.0935
42
2.375
0.0938
3/32
2.381
0.0945
2.40
2.400
0.0960
41
2.438
0.0980
40
2.489
inches
Fraction
Gauge
Metric
mm
0.0984
2.50
2.500
0.0995
39
2.527
0.1015
38
2.578
0.1024
2.60
2.600
0.1040
37
2.642
0.1063
2.70
2.700
0.1065
36
2.705
0.1094
7/64
2.778
0.1100
35
2.794
0.1102
2.80
2.800
0.1110
34
2.819
0.1130
33
2.870
0.1142
2.90
2.900
0.1160
32
2.946
0.1181
3.00
3.000
0.1200
31
3.048
0.1250
1/8
3.175
0.1260
3.20
3.200
0.1285
30
3.264
0.1299
3.30
3.300
0.1339
3.40
3.400
0.1360
29
3.454
0.1378
3.50
3.500
0.1405
28
3.569
0.1406
9/64
3.572
0.1417
3.60
3.600
0.1440
27
3.658
0.1457
3.70
3.700
0.1470
26
3.734
0.1495
25
3.797
0.1496
3.80
3.800
0.1520
24
3.861
0.1535
3.90
3.900
0.1540
23
3.912
0.1562
5/32
3.969
0.1570
22
3.988
0.1575
4.00
4.000
0.1590
21
4.039
0.1610
20
4.089
0.1614
4.10
4.100
0.1654
4.20
4.200
0.1660
19
4.216
0.1693
4.30
4.300
0.1695
18
4.305
0.1719
11/64
4.366
0.1730
17
4.394
0.1732
4.40
4.400
0.1770
16
4.496
0.1772
4.50
4.500
0.1800
15
4.572
inches
Fraction
Gauge
Metric
mm
0.1811
4.60
4.600
0.1820
14
4.623
0.1850
13
4.70
4.700
0.1875
3/16
4.762
0.1890
12
4.80
4.800
0.1910
11
4.851
0.1929
4.90
4.900
0.1935
10
4.915
0.1960
9
4.978
0.1969
5.00
5.000
0.1990
8
5.055
0.2008
5.10
5.100
0.2010
7
5.105
0.2031
13/64
5.159
0.2040
6
5.182
0.2047
5.20
5.200
0.2055
5
5.220
0.2087
5.30
5.300
0.2090
4
5.309
0.2126
5.40
5.400
0.2130
3
5.410
0.2165
5.50
5.500
0.2188
7/32
5.556
0.2205
5.60
5.600
0.2210
2
5.613
0.2244
5.70
5.700
0.2264
5.750
0.2280
1
5.791
0.2283
5.80
5.800
0.2323
5.90
5.900
0.2340
A
5.944
0.2344
15/64
5.953
0.2362
6.00
6.000
0.2380
B
6.045
0.2402
6.10
6.100
0.2420
C
6.147
0.2441
6.20
6.200
0.2460
D
6.248
0.2461
6.25
6.250
0.2480
6.30
6.300
0.2500
1/4
E
6.350
0.2520
6.40
6.400
0.2559
6.50
6.500
0.2570
F
6.528
0.2598
6.60
6.600
0.2610
G
6.629
0.2638
6.70
6.700
0.2656
17/64
6.747
0.2660
H
6.756
0.2677
6.80
6.800
inches
Fraction
Gauge
Metric
mm
0.2717
6.90
6.900
0.2720
I
6.909
0.2756
7.00
7.000
0.2770
J
7.036
0.2795
7.10
7.100
0.2810
K
7.137
0.2812
9/32
7.144
0.2835
7.20
7.200
0.2874
7.30
7.300
0.2900
L
7.366
0.2913
7.40
7.400
0.2950
M
7.493
0.2953
7.50
7.500
0.2969
19/64
7.541
0.2992
7.60
7.600
0.3020
N
7.671
0.3031
7.70
7.700
0.3071
7.80
7.800
0.3110
7.90
7.900
0.3125
5/16
7.938
0.3150
8.00
8.000
0.3160
O
8.026
0.3189
8.10
8.100
0.3228
8.20
8.200
0.3230
P
8.204
0.3268
8.30
8.300
0.3281
21/64
8.334
0.3307
8.40
8.400
0.3320
Q
8.433
0.3346
8.50
8.500
0.3386
8.60
8.600
0.3390
R
8.611
0.3425
8.70
8.700
0.3438
11/32
8.731
0.3465
8.80
8.800
0.3480
S
8.839
0.3504
8.90
8.900
0.3543
9.00
9.000
0.3580
T
9.093
0.3583
9.10
9.100
0.3594
23/64
9.128
0.3622
9.20
9.200
0.3661
9.30
9.300
0.3680
U
9.347
0.3701
9.40
9.400
0.3740
9.50
9.500
0.3750
3/8
9.525
0.3770
V
9.576
0.3780
9.60
9.600
0.3819
9.70
9.700
inches
Fraction
Gauge
Metric
mm
0.3858
9.80
9.800
0.3860
W
9.804
0.3898
9.90
9.900
0.3906
25/64
9.922
0.3937
10.00
10.000
0.3970
X
10.084
0.3976
10.10
10.100
0.4016
10.20
10.200
0.4040
Y
10.262
0.4055
10.30
10.300
0.4062
13/32
10.319
0.4094
10.40
10.400
0.4130
Z
10.490
0.4134
10.50
10.500
0.4173
10.60
10.600
0.4213
10.70
10.700
0.4219
27/64
10.716
0.4252
10.80
10.800
0.4291
10.90
10.900
0.4331
11.00
11.000
0.4370
11.10
11.100
0.4375
7/16
11.112
0.4409
11.20
11.200
0.4449
11.30
11.300
0.4488
11.40
11.400
0.4528
11.50
11.500
0.4531
29/64
11.509
0.4567
11.60
11.600
0.4606
11.70
11.700
0.4646
11.80
11.800
0.4685
11.90
11.900
0.4688
15/32
11.906
0.4724
12.00
12.000
0.4764
12.10
12.100
0.4803
12.20
12.200
0.4843
12.30
12.300
0.4844
31/64
12.303
0.4882
12.40
12.400
0.4921
12.50
12.500
0.4691
12.60
12.600
0.5000
1/2
12.700
0.5039
12.80
12.800
0.5079
12.90
12.900
0.5118
13.00
13.000
0.5156
33/64
13.097
0.5157
13.10
13.100
0.5197
13.20
13.200
0.5236
13.30
13.300
0.5276
13.40
13.400
0.5312
17/32
13.494
inches
Fraction
Gauge
Metric
mm
0.5315
13.50
13.500
0.5354
13.60
13.600
0.5394
13.70
13.700
0.5433
13.80
13.800
0.5469
35/64
13.891
0.5472
1MT
13.90
13.900
0.5512
2MT
14.00
14.000
0.5625
9/16
14.288
0.5709
14.50
14.500
0.5781
37/64
14.684
0.5906
15.00
15.000
0.5938
19/32
15.081
0.6094
39/64
15.478
0.6102
15.50
15.500
0.6201
15.75
15.750
0.6250
5/8
15.875
0.6299
16.00
16.000
0.6398
16.25
16.250
0.6406
41/64
16.272
0.6496
16.50
16.500
0.6594
16.75
16.750
0.6562
21/32
16.669
0.6693
17.00
17.000
0.6719
43/64
17.066
0.6791
17.25
17.250
0.6875
11/16
17.462
0.6890
17.50
17.500
0.6988
17.75
17.750
0.7031
45/64
17.859
0.7087
18.00
18.000
0.7185
18.25
18.250
0.7188
23/32
18.256
0.7283
18.50
18.500
0.7344
47/64
18.653
0.7382
18.75
18.750
0.7480
19.00
19.000
0.7500
3/4
19.050
0.7579
19.25
19.250
0.7656
49/64
19.447
0.7677
19.50
19.500
0.7776
19.75
19.750
0.7812
25/32
19.844
0.7874
20.00
20.000
0.7969
51/64
20.241
0.7972
20.25
20.250
0.8071
20.50
20.500
0.8125
13/16
20.638
0.8169
20.75
20.750
0.8268
21.00
21.000
0.8281
53/64
21.034
inches
Fraction
Gauge
Metric
mm
0.8366
21.25
21.250
0.8438
27/32
21.431
0.8465
21.50
21.500
0.8563
21.75
21.750
0.8594
55/64
21.828
0.8661
22.00
22.000
0.8750
7/8
22.225
0.8760
22.25
22.250
0.8858
22.50
22.500
0.8906
57/64
22.622
0.8957
22.75
22.750
0.9055
23.00
23.000
0.9062
29/32
2MT
23.019
0.9154
3MT
23.25
23.250
0.9219
59/64
23.416
0.9252
23.50
23.500
0.9350
23.75
23.750
0.9375
15/16
23.812
0.9449
24.00
24.000
0.9531
61/64
24.209
0.9547
24.25
24.250
0.9646
24.50
24.500
0.9688
31/32
24.606
0.9744
24.75
24.750
0.9843
25.00
25.000
0.9844
63/64
25.003
0.9941
25.25
25.250
1.0000
1
25.400
1.0039
25.50
25.500
1.0138
25.75
25.750
1.0156
1 1/64
25.797
1.0236
26.00
26.000
1.0312
1 1/32
26.194
1.0335
26.25
26.250
1.0433
26.50
26.500
1.0469
1 3/64
26.591
1.0531
26.75
26.750
1.0625
1 1/16
26.988
1.0630
27.00
27.000
1.0728
27.25
27.250
1.0781
1 5/64
27.384
1.0827
27.50
27.500
1.0925
27.75
27.750
1.0938
1 3/32
27.781
1.1024
28.00
28.000
1.1094
1 7/64
28.178
1.1122
28.25
28.250
1.1220
28.50
28.500
1.1250
1 1/8
28.575
1.1319
28.75
28.750
inches
Fraction
Gauge
Metric
mm
1.1406
1 9/64
28.972
1.1417
29.00
29.000
1.1516
29.25
29.250
1.1562
1 5/32
29.369
1.1614
29.50
29.500
1.1713
29.75
29.750
1.1719
1 11/64
29.766
1.1811
30.00
30.000
1.1875
1 3/16
30.162
1.1909
30.25
30.250
1.2008
30.50
30.500
1.2031
1 13/64
30.559
1.2106
30.75
30.750
1.2188
1 7/32
30.956
1.2205
31.00
31.000
1.2303
31.25
31.250
1.2344
1 15/64
31.353
1.2402
31.50
31.500
1.2500
1 1/4
3MT
31.75
31.750
1.2598
4MT
32.00
32.000
1.2656
1 17/64
32.147
1.2795
32.50
32.500
1.2813
1 9/32
32.544
1.2969
1 19/64
32.941
1.2992
33.00
33.000
1.3125
1 5/16
33.338
1.3189
33.50
33.500
1.3281
1 21/64
33.734
1.3386
34.00
34.000
1.3438
1 11/32
34.131
1.3583
34.50
34.500
1.3594
1 23/64
34.528
1.3750
1 3/8
34.925
1.3780
35.00
35.000
1.3906
1 25/64
35.322
1.3976
35.50
35.500
1.4063
1 13/32
35.719
1.4173
36.00
36.000
1.4219
1 27/64
36.116
1.4370
36.50
36.500
1.4375
1 7/16
36.513
1.4531
1 29/64
36.909
1.4567
37.00
37.000
1.4688
1 15/32
37.306
1.4764
37.50
37.500
1.4844
1 31/64
37.703
1.4961
38.00
38.000
1.5000
1 1/2
38.100