Inch/MetrIc tap DrIll SIzeS & DecIMal equIvalentS
Inch/Metric Tap Drill Sizes & Decimal Equivalents
Drill Size
decimal EQUIValent
80
1
79
64
78
77
76
75
74
73
72
71
70
69
1
68
32
67
66
65
64
63
62
61
60
59
58
57
3
56
64
55
54
1 53
16 52
51
50
49
5
48
64
47
46
45
44
43
3
42
32
41
40
39
38
37
7
36
64
35
34
33
32
1 31
8 30
29
9
28
64
27
26
25
24
5
23
32 22
21
20
19
11
18
64
17
16
15
14
3 13
16 12
11
.0135 .0145 .0156 .0160 .0180 .0200 .0210 .0225 .0240 .0250 .0260 .0280 .0292 .0310 .0312 .0320 .0330 .0350 .0360 .0370 .0380 .0390 .0400 .0410 .0420 .0430 .0465 .0469 .0520 .0550 .0595 .0625 .0635 .0670 .0700 .0730 .0760 .0781 .0785 .0810 .0820 .0860 .0890 .0935 .0938 .0960 .0980 .0995 .1015 .1040 .1065 .1094 .1100 .1110 .1130 .1160 .1200 .1250 .1285 .1360 .1405 .1406 .1440 .1470 .1495 .1520 .1540 .1562 .1570 .1590 .1610 .1660 .1695 .1719 .1730 .1770 .1800 .1820 .1850 .1875 .1890 .1910
tap size
0 - 80 1 - 64, 72 2 - 56, 64
3 - 48 3 - 56 4 - 40 4 - 48 5 - 40 5 - 44 6 - 32 6 - 40 8 - 32, 36 10 - 24 10 - 32 12 - 24 12 - 28
Bulletin 1214-5M/S 05/10
Drill Size
10
9
8
13
7
64
6
5
4
7
3
32
2
1
15
A
64
B
C
1 4
D E F
17
G
64
H
I
J
9
K
32
L
19
M
64
5N
16 O
21
P
64
Q
11
R
32
S
23
T
64
3U
8V
25
W
64
X
13
Y
32 27
Z
64 7
29 16 64 15 31 32
64
1
33 2
64 17
35 32
64
9
37 16
64 19
39 32
64
5
41
8
64 21 43 32 64 11
45 16 64 23 47 32
64
3
49
4
64 25
51 32
64 13
53 16 64 27 55 32
64
7
57
8
64 29
32
decimal EQUIValent
.1935 .1960 .1990 .2010 .2031 .2040 .2055 .2090 .2130 .2188 .2210 .2280 .2340 .2344 .2380 .2420 .2460 .2500 .2570 .2610 .2656 .2660 .2720 .2770 .2810 .2812 .2900 .2950 .2969 .3020 .3125 .3160 .3230 .3281 .3320 .3390 .3438 .3480 .3580 .3594 .3680 .3750 .3770 .3860 .3906 .3970 .4040 .4062 .4130 .4219 .4375 .4531 .4688 .4844 .5000 .5156 .5312 .5469 .5625 .5781 .5938 .6094 .6250 .6406 .6562 .6719 .6875 .7031 .7188 .7344 .7500 .7656 .7812 .7969 .8125 .8281 .8438 .8594 .8750 .8906 .9062
tap size
1/4 - 20 1/4 - 28
5/16 - 18 5/16 - 24
3/8 - 16 3/8 - 24
7/16 - 14 7/16 - 20 1/2 - 13 1/2 - 20 9/16 - 12 9/16 - 18 5/8 - 11 5/8 - 18 3/4 - 10 3/4 - 16
7/8 - 9 7/8 - 14
1 - 8
Drill Size
59
64 15
61 16
64 31
63 32
64
1
13/64
17/64
11/8
111/64
17/32
11/4
119/64
111/32
13/8
127/64
11/2
decimal EQUIValent
.9219 .9375 .9531 .9688 .9844 1.0000 1.0469 1.1094 1.1250 1.1719 1.2188 1.2500 1.2969 1.3438 1.3750 1.4219 1.5000
tap size
1 - 12 1 - 14
11/8 - 7 11/8 - 12 11/4 - 7 11/4 - 12 13/8 - 6 13/8 - 12 11/2 - 6 11/2 - 12
Metric Tap Drill Sizes
Metric Tap
Tap Drill (mm) Decimal (Inch)
M1.6 x 0.35 M1.8 x 0.35 M2 x 0.4 M2.2 x 0.45
1.25 1.45 1.60 1.75
.0492 .0571 .0630 .0689
M2.5 x 0.45 M3 x 0.5 M3.5 x 0.6 M4 x 0.7
2.05 2.50 2.90 3.30
.0807 .0984 .1142 .1299
M4.5 x 0.75 M5 x 0.8 M6 x 1 M7 x 1
3.70 4.20 5.00 6.00
.1457 .1654 .1968 .2362
M8 x 1.25 M8 x 1 M10 x 1.5 M10 x 1.25
6.70 7.00 8.50 8.70
.2638 .2756 .3346 .3425
M12 x 1.75 M12 x 1.25 M14 x 2 M14 x 1.5
10.20 10.80 12.00 12.50
.4016 .4252 .4724 .4921
M16 x 2 M16 x 1.5 M18 x 2.5 M18 x 1.5
14.00 14.50 15.50 16.50
.5512 .5709 .6102 .6496
M20 x 2.5 M20 x 1.5 M22 x 2.5 M22 x 1.5
17.50 18.50 19.50 20.50
.6890 .7283 .7677 .8071
M24 x 3 M24 x 2 M27 x 3 M27 x 2
21.00 22.00 24.00 25.00
.8268 .8661 .9449 .9843
M30 x 3.5 M30 x 2 M33 x 3.5 M33 x 2
26.50 28.00 29.50 31.00
1.0433 1.1024 1.1614 1.2205
M36 x 4 M36 x 3 M39 x 4 M39 x 3
32.00 33.00 35.00 36.00
1.2598 1.2992 1.3780 1.4173
pipe thread Sizes (npsc)
thread
drill
thread
drill
1/8 ? 27 1/4 ? 18 3/8 ? 18 1/2 ? 14 3/4 ? 14
1 ? 111/2 11/4 ? 111/2
11/32 7/16 37/64 23/32 59/64 15/32 11/2
11/2 ? 111/2 13/4
2 ? 111/2 27/32
21/2 ? 8
221/32
3 ? 8
31/4
31/2 ? 8
33/4
4 ? 8
41/4
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