Tap and Drill Chart

 

TAP
TAP DRILL
Decimal Drill Size
Theo. % of Thread
Probable Oversize
Probable Hole Size
% of THREAD
0-80
56
.0465
83
.0015
.0480
74
3/64
.0469
81
.0015
.0480
71
1-64
54
.0550
89
.0015
.0565
81
53
.0595
67
.0015
.0610
59
1-72
53
.0595
75
.0015
.0610
67
1/16
.0625
58
.0015
.0640
50
2-56
51
.0670
82
.0017
.0687
74
50
.0700
69
.0017
.0717
62
49
.0730
56
.0017
.0747
49
2-64
50
.0700
79
.0017
.0717
70
49
.0730
64
.0017
.0747
56
3-48
48
.0760
85
.0019
.0779
78
5/64
.0781
77
.0019
.0800
70
47
.0785
76
.0019
.0804
69
46
.0810
67
.0019
.0829
60
45
.0820
63
.0019
.0839
56
3-56
46
.0810
78
.0019
.0829
69
45
.0820
73
.0019
.0839
65
44
.0860
56
.0020
.0880
47
4-40
44
.0860
80
.0020
.0880
74
43
.0890
71
.0020
.0910
65
42
.0935
57
.0020
.0955
51
3/32
.0938
56
.0020
.0958
50
4-48
42
.0935
68
.0020
.0955
61
3/32
.0938
68
.0020
.0958
60
41
.0960
59
.0020
.0980
52
5-40
40
.0980
83
.0023
.1003
76
39
.0995
79
.0023
.1018
71
38
.1015
72
.0023
.1038
65
37
.1040
65
.0023
.1063
58
5-44
38
.1015
79
.0023
.1038
72
37
.1040
71
.0023
.1063
63
36
.1065
63
.0023
.1088
55
6-32
37
.1040
84
.0023
.1063
78
36
.1065
78
.0023
.1088
72
7-64
.1094
70
.0026
.1120
64
35
.1100
69
.0026
.1126
63
34
.1110
67
.0026
.1136
60
33
.1130
62
.0026
.1156
55
6-40
34
.1110
83
.0026
.1136
75
33
.1130
77
.0026
.1156
69
32
.1160
68
.0026
.1186
60
8-32
29
.1360
69
.0029
.1389
62
28
.1405
58
.0029
.1434
51
8-36
29
.1360
78
.0029
.1389
70
28
.1405
68
.0029
.1434
57
9-64
.1406
68
.0029
.1435
57
10-24
27
.1440
85
.0032
.1472
79
26
.1470
79
.0032
.1502
74
25
.1495
75
.0032
.1527
69
10-24
24
.1520
70
.0032
.1552
64
23
.1540
67
.0032
.1572
61
5/32
.1563
62
.0032
.1595
56
22
.1570
61
.0032
.1602
55
10-32
5/32
.1563
83
.0032
.1595
75
22
.1570
81
.0032
.1602
73
21
.1590
76
.0032
.1622
68
20
.1610
71
.0032
.1642
64
19
.1660
59
.0032
.1692
51
12-24
11/64
.1719
82
.0035
.1754
75
17
.1730
79
.0035
.1765
73
16
.1770
72
.0035
.1805
66
15
.1800
67
.0035
.1835
60
14
.1820
63
.0035
.1855
56
12-28
16
.1770
84
.0035
.1805
77
15
.1800
78
.0035
.1835
70
14
.1820
73
.0035
.1855
66
13
.1850
67
.0035
.1885
59
3/16
.1875
61
.0035
.1910
54
1/4-20
9
.1960
83
.0038
.1998
77
8
.1990
79
.0038
.2028
73
7
.2010
75
.0038
.2048
70
13/64
.2013
72
.0038
.2069
66
6
.2040
71
.0038
.2078
65
5
.2055
69
.0038
.2093
63
4
.2090
63
.0038
.2128
57
1/4-28
3
.2130
80
.0038
.2168
72
7/32
.2188
67
.0038
.2226
59
2
.2210
63
.0038
.2248
55
5/16-18
F
.2570
77
.0038
.2608
72
G
.2610
71
.0041
.2651
66
17/64
.2656
65
.0041
.2697
59
H
.2660
64
.0041
.2701
59
5/16-24
H
.2660
86
.0041
.2701
78
I
.2720
75
.0041
.2761
67
J
.2770
66
.0041
.2811
58
3/8-16
5/16
.3125
77
.0044
.3169
72
O
.3160
73
.0044
.3204
68
P
.323
64
.0044
.3274
59
3/8-24
21/64
.3281
87
.0044
.3325
79
Q
.3320
79
.0044
.3364
71
R
.3390
67
.0044
.3434
58
7/16-14
T
.3580
86
.0046
.3626
81
23/64
.3594
84
.0046
.3640
79
U
.3680
75
.0046
.3726
70
3/8
.3750
67
.0046
.3796
62
V
.3770
65
.0046
.3816
60
7/16-20
W
.3860
79
.0046
.3906
72
25/64
.3906
72
.0046
.3952
65
X
.3970
62
.0046
.4016
55
1/2-13
27/64
.4219
78
.0047
.4266
73
7/16
.4375
63
.0047
.4422
58
1/2-20
29/64
.4531
72
.0047
.4578
65
9/16-12
15/32
.4688
87
.0048
.4736
82
31/64
.4844
72
.0048
.4892
68
9/16-18
1/2
.500
87
.0048
.5048
80
33/64
.5156
65
.0048
.5204
58
33/64
.5156
65
.0048
.5204
58

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