TAP DRILL SIZES AND PERCENTAGE OF THREADS

TAP TAP DRILL DECIM. EQUIV. THEOR. %OF THREAD
NOM. SIZE TPI
0 80 #56
3/64		 .0465
.0469		 83
81
1 64 #54
#53		 .0550
.0595		 89
67
1 72 #53
1/16		 .0595
.0625		 75
58
2 56 #51
#50
#49		 .0670
.0700
.0730		 82
69
56
2 64 #50
#49		 .0700
.0730		 79
64
3 48 #48
5/64
#47
#46
#45		 .0760
.0781
.0785
.0810
.0820		 85
77
76
67
63
3 56 #48
#45
#44		 .0810
.0820
.0860		 78
73
56
4 40 #44
#43
#42
3/32		 .0860
.0890
.0935
.0938		 80
71
57
56
4 48 #43
#42
3/32
#41 		.0890
.0935
.0938
.0960		 85
68
67
59
5 40 #40
#39
#38
#37		 .0980
.0995
.1015
.1040		 83
79
72
65
5 44 #38
#37
#36		 .1015
.1040
.1065		 80
71
63
6 32 #37
#36
7/64
#35
#34
#33		 .1040
.1065
.1094
.1100
.1110
.1130		 84
78
70
69
67
62
6 40 #34
#33
#32		 .1110
.1130
.1160		 83
77
68
8 32 #29 .1360 69
8 36 #29
#28
9/64		 .1360
.1405
.1406		 78
65
65
10 24 #27
#26
#25
#24
#23		 .1440
.1470
.1495
.1520
.1540		 85
79
75
70
66
10 32 5/32
#22
#21
#20		 .1562
.1570
.1590
.1610		 83
81
76
71
12 24 11/64
#17
#16
#15		 .1719
.1730
.1770
.1800		 82
79
72
67
12 28 #16
#15
#14
#13		 .1770
.1800
.1820
.1850		 84
78
73
67
12 32 #14
#13
3/16
#12		 .1820
.1850
.1875
.1890		 84
76
70
67
1/4 20 #9
#8
#7		 .1960
.1990
.2010		 83
79
75
TAP TAP DRILL DECIM. EQUIV. THEOR. %OF THREAD
NOM. SIZE TPI
1/4 20 13/64
#6
#5		 .2031
.2040
.2055		 72
71
69
1/4 28 #3
7/32		 .2130
.2188		 80
67
1/4 32 7/32
#2		 .2188
.2210		 77
71
1/4 36 #2 .2210 80
5/16 18 F
G		 .2570
.2610		 77
71
5/16 20 F
G
H		 .2570
.2610
.2660		 85
79
72
5/16 24 H
I
J		 .2660
.2720
.2770		 86
75
66
5/16 28 J
K
9/32		 .2770
.2810
.2812		 77
68
67
5/16 32 K
9/32		 .2810
.2812		 78
77
5/16 36 7.25mm .2854 75
3/8 16 5/16
O		 .3125
.3160		 77
73
3/8 20 P
Q		 .3230
.3320		 80
66
3/8 24 Q
R		 .3320
.3390		 79
67
3/8 28 R
11/32		 .3390
.3438		 78
67
3/8 32 11/32
S		 .3438
.3480		 77
67
3/8 36 S .3480 75
7/16 14 T
23/64		 .3580
.3594		 86
84
7/16 16 3/8
V		 .3750
.3770		 77
75
7/16 20 W
25/64		 .3860
.3906		 79
72
7/16 28 Y .4040 72
7/16 32 Y
13/32		 .4040
.4062		 83
77
1/2 12 Z
27/64		 .4130
.4219		 80
72
1/2 13 27/64 .4219 78
1/2 16 7/16 .4375 77
1/2 20 29/64 .4531 72
1/2 28 15/32 .4688 67
1/2 32 15/32 .4688 77
9/16 12 15/32
31/64		 .4688
.4844		 87
72
9/16 16 1/2
0.5062		 .5000
.5062		 77
69
9/16 18 1/2
0.5062		 .5000
.5062		 87
78
9/16 20 33/64 .5156 72
9/16 24 33/64
0.5203		 .5156
.5203		 87
78
9/16 28 17/32
0.5263		 .5312
.5263		 67
78
9/16 32 17/32 .5312 77
5/8 11 17/32 .5312 79
5/8 12 35/64 .5469 72
5/8 16 9/16
0.5687		 .5625
.5687		 77
69
TAP TAP DRILL DECIM. EQUIV. THEOR. %OF THREAD
NOM. SIZE TPI
5/8 18 9/16
0.5687		 .5625
.5687		 87
78
5/8 20 37/64 .5781 72
5/8 24 37/64
0.5828		 .5781
.5828		 87
78
5/8 28 19/32 .5938 67
5/8 32 19/32 .5938 77
11/16 12 19/32
39/64		 .5938
.6094		 87
72
11/16 16 5/8 .6250 77
11/16 20 41/64 .6406 72
11/16 24 41/64 .6406 87
11/16 28 21/32 .6562 67
11/16 32 21/32 .6562 77
3/4 10 41/64
21/32		 .6406
.6562		 84
72
3/4 12 21/32
43/64		 .6562
.6719		 87
72
3/4 16 11/16 .6875 77
3/4 20 45/64 .7031 72
3/4 28 23/32 .7188 67
3/4 32 23/32 .7188 77
13/16 12 47/64 .7344 72
13/16 16 3/4 .7500 77
13/16 20 49/64 .7656 72
13/16 28 25/32 .7812 67
13/16 32 25/32 .7812 77
7/8 9 49/64 .7656 76
7/8 12 25/32
51/64		 .7812
.7969		 87 72
7/8 14 51/64
0.8024
13/16		 .7969
.8024
.8125		 84
78
67
7/8 16 13/16 .8125 77
7/8 20 53/64 .8281 72
7/8 28 27/32 .8438 67
7/8 32 27/32 .8438 77
15/16 12 27/32
55/64		 .8438
.8594		 87
72
15/16 16 7/8 .8750 77
15/16 20 57/64 .8906 72
15/16 28 29/32 .9062 67
15/16 32 29/32 .9062 77
1 8 55/64
7/8		 .8594
.8750		 87
77
1 12 29/32
59/64		 .9062
.9219		 87
72
1 14 59/64
0.9274		 .9219
.9274		 84
78
1 16 15/16 .9375 77
1 20 61/64 .9531 72
1 28 31/32 .9688 67
1 32 31/32 .9688 77
1 1/16 8 59/64
0.9274
15/16		 .9219
.9274
.9375		 87
83
77
1 1/16 12 31/32
63/64		 .9688
.9844		 87
72
1 1/16 16 1 1.0000 77
1 1/16 18 1 1.0000 87
1 1/16 20 11/64 1.0156 72