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MadaboutKitcars

Drill and tap size chart

A size chart for drills and taps

Below is a comprehensive drill and tap size chart for all drills, imperial and metric, and taps up to 1 inch. A pdf version is available as a quick reference.

This list is incomplete; you can help by and tap size chart|action=edit expanding it.
Diameter Diameter Fractional Drill wire gauge Tap size.. Clearance Clearance Theoretical percentage of thread.
mm (3 d.p.) in (5 d.p.) in close fit. free fit %
0.250 0.00984
0.300 0.01181
0.343 0.01350 80
0.350 0.01378
0.368 0.01449 79
0.397 0.01563 1/64
0.400 0.01575
0.406 0.01600 78
0.420 0.01654
0.440 0.01732
0.450 0.01772
0.457 0.01800 77
0.460 0.01811
0.480 0.01890
0.500 0.01969
0.508 0.02000 76
0.533 0.02100 75
0.550 0.02165
0.572 0.02250 74
0.600 0.02362
0.610 0.02400 73
0.635 0.02500 72
0.650 0.02559
0.660 0.02600 71
0.700 0.02756
0.711 0.02800 70
0.742 0.02920 69
0.750 0.02953
0.787 0.03100 68
0.794 0.03125 1/32
0.800 0.03150
8.128 0.32000 67
0.838 0.03300 66
0.850 0.03346
0.889 0.03500 65
0.900 0.03543
0.914 0.03600 64
0.940 0.03700 63
0.950 0.03740
0.965 0.03800 62
0.991 0.03900 61
1.000 0.03937
10.160 0.40000 60
1.041 0.04100 59
1.050 0.04134
1.067 0.04200 58
1.092 0.04300 57
1.100 0.04331
1.150 0.04528
1.181 0.04650 56
1.191 0.04688 3/64 #0-80 0.06350" 0.07000"
1.200 0.04724
1.250 0.04921
1.300 0.05118
1.321 0.05200 55
1.350 0.05315
1.397 0.05500 54
1.400 0.05512
1.450 0.05709
1.500 0.05906
1.511 0.05950 53 #1-64, #1-72 0.07600" 0.08100"
1.550 0.06102
1.588 0.06250 1/16
1.600 0.06299
1.613 0.06350 52
1.650 0.06496
1.700 0.06693
1.702 0.06700 51 #2-56 0.08900" 0.09600"
1.750 0.06890
1.778 0.07000 50 #2-56, #2-64 0.08900" 0.09600"
1.800 0.07087
1.850 0.07283
1.854 0.07300 49
1.900 0.07480
1.930 0.07600 48
1.950 0.07677
1.984 0.07813 5/64 #3-48 0.10400" 0.11000" 78
1.994 0.07850 47 #3-48 0.10400" 0.11000" 76
2.000 0.07874
2.050 0.08071
2.057 0.08100 46
2.083 0.08200 45 #3-56 0.10400" 0.11000" 74
2.100 0.08268
2.150 0.08465
2.184 0.08600 44 #4-36 0.11600" 0.12850"
2.200 0.08661
2.250 0.08858
2.261 0.08900 43 #4-40 0.11600" 0.12850" 71
2.300 0.09055
2.350 0.09252
2.375 0.09350 42 #4-48 0.11600" 0.12850" 69
2.381 0.09375 3/32
2.400 0.09449
2.438 0.09600 41
2.450 0.09646
2.489 0.09800 40
2.500 0.09843
2.527 0.09950 39 #5-40 0.12850" 0.13600" 78
2.578 0.10150 38 #5-40 0.12850" 0.13600" 72
2.600 0.10236
2.642 0.10400 37 #5-44 0.12850" 0.13600" 71
2.700 0.10630
2.705 0.10650 36 #6-32 0.14400" 0.14950" 77
2.750 0.10827
2.778 0.10938 7/64
2.794 0.11000 35
2.800 0.11024
2.819 0.11100 34
2.870 0.11300 33
2.900 0.11417
2.946 0.11600 32
3.000 0.11811
3.048 0.12000 31
3.100 0.12205
3.175 0.12500 1/8
3.200 0.12598
3.250 0.12795
3.264 0.12850 30
3.300 0.12992
3.400 0.13386
3.454 0.13600 29 #8-32 0.16950" 0.17700" 69
3.500 0.13780
3.569 0.14050 28
3.572 0.14063 9/64
3.600 0.14173
3.658 0.14400 27
3.700 0.14567
3.734 0.14700 26
3.750 0.14764
3.797 0.14950 25 #10-24 0.19600" 0.20100" 75
3.800 0.14961
3.861 0.15200 24
3.900 0.15354
3.912 0.15400 23
3.969 0.15625 5/32
3.988 0.15700 22
4.000 0.15748
4.039 0.15900 21
4.089 0.16100 20
4.100 0.16142
4.200 0.16535
4.216 0.16600 19
4.250 0.16732
4.300 0.16929
4.305 0.16950 18
4.366 0.17188 11/64
4.394 0.17300 17
4.400 0.17323
4.496 0.17700 16 #12-24 0.22100" 0.22800" 72
4.500 0.17717
4.572 0.18000 15
4.600 0.18110
4.623 0.18200 14
4.699 0.18500 13
4.700 0.18504
4.750 0.18701
4.763 0.18750 3/16
4.800 0.18898
4.801 0.18900 12
4.851 0.19100 11
4.900 0.19291
4.915 0.19350 10
4.978 0.19600 9
5.000 0.19685
5.055 0.19900 8
5.100 0.20079
5.105 0.20100 7 1/4-20 0.25700" 0.26600" 72
5.159 0.20313 13/64
5.182 0.20400 6
5.200 0.20472
5.220 0.20550 5
5.250 0.20669
5.300 0.20866
5.309 0.20900 4
5.400 0.21260
5.410 0.21300 3 1/4-28 0.25700" 0.26600" 80
5.500 0.21654
5.556 0.21875 7/32
5.600 0.22047
5.613 0.22100 2
5.700 0.22441
5.750 0.22638
5.791 0.22800 1
5.800 0.22835
5.900 0.23228
5.944 0.23400 A
5.953 0.23438 15/64
6.000 0.23622
6.045 0.23800 B
6.100 0.24016
6.147 0.24200 C
6.200 0.24409
6.248 0.24600 D
6.250 0.24606
6.300 0.24803
6.350 0.25000 1/4 E
6.400 0.25197
6.500 0.25591
6.528 0.25700 F 5/16-18 0.32300" 0.33200" 77
6.600 0.25984
6.629 0.26100 G
6.700 0.26378
6.747 0.26563 17/64
6.750 0.26575
6.756 0.26600 H
6.800 0.26772
6.900 0.27165
6.909 0.27200 I 5/16-24 0.32300" 0.33200" 75
7.000 0.27559
7.036 0.27700 J
7.100 0.27953
7.137 0.28100 K
7.144 0.28125 9/32
7.200 0.28346
7.250 0.28543
7.300 0.28740
7.366 0.29000 L
7.400 0.29134
7.493 0.29500 M
7.500 0.29528
7.541 0.29688 19/64
7.600 0.29921
7.671 0.30200 N
7.700 0.30315
7.750 0.30512
7.800 0.30709
7.900 0.31102
7.938 0.31250 5/16 3/8-16 0.38600" 0.39700" 77
8.000 0.31496
8.026 0.31600 O
8.100 0.31890
8.200 0.32283
8.204 0.32300 P
8.250 0.32480
8.300 0.32677
8.334 0.32813 21/64
8.400 0.33071
8.433 0.33200 Q 3/8-24 0.38600" 0.39700" 79
8.500 0.33465
8.600 0.33858
8.611 0.33900 R
8.700 0.34252
8.731 0.34375 11/32
8.750 0.34449
8.800 0.34646
8.839 0.34800 S
8.900 0.35039
9.000 0.35433
9.093 0.35800 T
9.100 0.35827
9.128 0.35938 23/64
9.200 0.36220
9.250 0.36417
9.300 0.36614
9.347 0.36800 U 7/16-14 0.45310" 0.46870" 75
9.400 0.37008
9.500 0.37402
9.525 0.37500 3/8
9.576 0.37700 V
9.600 0.37795
9.700 0.38189
9.750 0.38386
9.800 0.38583
9.804 0.38600 W
9.900 0.38976
9.922 0.39063 25/64 7/16-20 0.45313" 0.46785" 72
10.000 0.39370
10.084 0.39700 X
10.262 0.40400 Y
10.319 0.40625 13/32
10.490 0.41300 Z
10.500 0.41339
10.716 0.42188 27/64 1/2-13 0.51563" 0.53125" 78
11.000 0.43307
11.113 0.43750 7/16
11.500 0.45276
11.509 0.45313 29/64 1/2-20 0.51563" 0.53125" 72
11.906 0.46875 15/32
12.000 0.47244
12.303 0.48438 31/64
12.500 0.49213
12.700 0.50000 1/2
13.000 0.51181
13.097 0.51563 33/64
13.494 0.53125 17/32
13.500 0.53150
13.891 0.54688 35/64
14.000 0.55118
14.288 0.56250 9/16
14.500 0.57087
14.684 0.57813 37/64
15.000 0.59055
15.081 0.59375 19/32
15.478 0.60938 39/64
15.500 0.61024
15.875 0.62500 5/8
16.000 0.62992
16.272 0.64063 41/64
16.500 0.64961
16.669 0.65625 21/32
17.000 0.66929
17.066 0.67188 43/64
17.463 0.68750 11/16
17.500 0.68898
17.859 0.70313 45/64
18.000 0.70866
18.256 0.71875 23/32
18.500 0.72835
18.653 0.73438 47/64
19.000 0.74803
19.050 0.75000 3/4
19.447 0.76563 49/64
19.500 0.76772
19.844 0.78125 25/32
20.000 0.78740
20.241 0.79688 51/64
20.500 0.80709
20.638 0.81250 13/16
21.000 0.82677
21.034 0.82813 53/64
21.431 0.84375 27/32
21.500 0.84646
21.828 0.85938 55/64
22.000 0.86614
22.225 0.87500 7/8
22.500 0.88583
22.622 0.89063 57/64
23.000 0.90551
23.019 0.90625 29/32
23.416 0.92188 59/64
23.500 0.92520
23.813 0.93750 15/16
24.000 0.94488
24.209 0.95313 61/64
24.500 0.96457
24.606 0.96875 31/32
25.000 0.98425
25.003 0.98438 63/34
25.400 1.00000 1

The file (including a macro to make wikitable) can be found here:Drill and tap size chart v2006-08-03-1730.xls