GENERAL INFORMATION
1.9
SAE TAP DRILL SIZES
Thread Size/Drill Size
Thread Size/Drill Size
#0-80
3/64
#1-64
53
#1-72
53
#2-56
51
#2-64
50
#3-48
5/64
#3-56
45
#4-40
43
#4-48
42
#5-40
38
#5-44
37
#6-32
36
#6-40
33
#8-32
29
#8-36
29
#10-24
24
#10-32
21
#12-24
17
#12-28
4.6mm
1/4-20
7
1/4-28
3
5/16-18
F
5/16-24
I
3/8-16
O
3/8-24
Q
7/16-14
U
7/16-20
25/64
1/2-13
27/64
1/2-20
29/64
9/16-12
31/64
9/16-18
33/64
5/8-11
17/32
5/8-18
37/64
3/4-10
21/32
3/4-16
11/16
7/8-9
49/64
7/8-14
13/16
1-8
7/8
1-12
59/64
1 1/8-7
63/64
1 1/8-12
1 3/64
1 1/4-7
1 7/64
1 1/4-12
1 11/64
1 1/2-6
1 11/32
1 1/2-12
1 27/64
1 3/4-5
1 9/16
1 3/4-12
1 43/64
2-4 1/2
1 25/32
2-12
1 59/64
2 1/4-4 1/2
2 1/32
2 1/2-4
2 1/4
2 3/4-4
2 1/2
3-4
2 3/4
METRIC TAP DRILL SIZES
Tap Size
Drill Size
Decimal
Equiva-
lent
Nearest
Fraction
3 x .50
3 x .60
4 x .70
4 x .75
5 x .80
5 x .90
6 x 1.00
7 x 1.00
8 x 1.00
8 x 1.25
9 x 1.00
9 x 1.25
10 x 1.25
10 x 1.50
11 x 1.50
12 x 1.50
12 x 1.75
#39
3/32
#30
1/8
#19
#20
#9
16/64
J
17/64
5/16
5/16
11/32
R
3/8
13/32
13/32
0.0995
0.0937
0.1285
0.125
0.166
0.161
0.196
0.234
0.277
0.265
0.3125
0.3125
0.3437
0.339
0.375
0.406
0.406
3/32
3/32
1/8
1/8
11/64
5/32
13/64
15/64
9/32
17/64
5/16
5/16
11/32
11/32
3/8
13/32
13/32
DECIMAL EQUIVALENTS
1/64
.0156
. . . . . . . . . . . . . . . .
1/32
.0312
1 mm = .0394
²
. . . . . . . . . . .
. . .
3/64
.0469
. . . . . . . . . . . . . . . .
1/16
.0625
. . . . . . . . . . .
5/64
.0781
2 mm = .0787
²
. . . . . . . . . . . . . . . .
. . .
3/32
.0938
. . . . . . . . . . .
7/64
.1094
3 mm = .1181
²
. . . . . . . . . . . . . .
. . .
1/8.
.1250
. . .
9/64
.1406
. . . . . . . . . . . . . . . .
5/32
.1563
4 mm = .1575
²
. . . . . . . . . . .
. . .
11/64
.1719
. . . . . . . . . . . . . . .
3/16
.1875
5 mm = .1969
²
. . . . . . . . . . .
. . .
13/64
.2031
. . . . . . . . . . . . . . .
7/32
.2188
. . . . . . . . . . .
15/64
.2344
6 mm = .2362
²
. . . . . . . . . . . . . . .
. . .
1/4
.25
. . . .
17/64
.2656
7 mm = .2756
²
. . . . . . . . . . . . . . .
. . .
9/32
.2813
. . . . . . . . . . .
19/64
.2969
. . . . . . . . . . . . . . .
5/16
.3125
8 mm = .3150
²
. . . . . . . . . . .
. . .
21/64
.3281
. . . . . . . . . . . . . . .
11/32
.3438
9 mm = .3543
²
. . . . . . . . . .
. . .
23/64
.3594
. . . . . . . . . . . . . . .
3/8
.375
. . . .
25/64
.3906
10 mm = .3937
²
. . . . . . . . . . . . . . .
. . .
13/32
.4063
. . . . . . . . .
27/64
.4219
11 mm = .4331
²
. . . . . . . . . . . . . . .
. . .
7/16
.4375
. . . . . . . . . . .
29/64
.4531
. . . . . . . . . . . . . . .
15/32
.4688
12 mm = .4724
²
. . . . . . . . .
. . .
31/64
.4844
. . . . . . . . . . . . . . .
1/2
.5
13 mm = .5118
. . . .
. . . . . . . . . . . . . .
33/64
.5156
. . . . . . . . . . . . . . .
17/32
.5313
. . . . . . . . .
35/64
.5469
14 mm = .5512
²
. . . . . . . . . . . . . . .
. . .
9/16
.5625
. . . . . . . . . . .
37/64
.5781
15 mm = .5906
²
. . . . . . . . . . . . . . .
. . .
19/32
.5938
. . . . . . . . .
39/64
.6094
. . . . . . . . . . . . . . .
5/8
.625
16 mm = .6299
²
. . . .
. . . . . . . . . . . .
41/64
.6406
. . . . . . . . . . . . . . .
21/32
.6563
17 mm = .6693
²
. . . . . . . . .
. . .
43/64
.6719
. . . . . . . . . . . . . .
11/16
.6875
. . . . . . . . . .
45/64
.7031
18 mm = .7087
²
. . . . . . . . . . . . . . .
. . .
23/32
.7188
. . . . . . . . .
47/64
.7344
19 mm = .7480
²
. . . . . . . . . . . . . . .
. . .
3/4
.75
. . . .
49/64
.7656
. . . . . . . . . . . . . . .
25/32
.7813
20 mm = .7874
²
. . . . . . . . .
. . .
51/64
.7969
. . . . . . . . . . . . . . .
13/16
.8125
21 mm = .8268
²
. . . . . . . . .
. . .
53/64
.8281
. . . . . . . . . . . . . . .
27/32
.8438
. . . . . . . . .
55/64
.8594
22 mm = .8661
²
. . . . . . . . . . . . . . .
. . .
7/8
.875
. . . .
57/64
.8906
23 mm = .9055
²
. . . . . . . . . . . . . . .
. . .
29/32
.9063
. . . . . . . . .
59/64
.9219
. . . . . . . . . . . . . .
15/16
.9375
24 mm = .9449
²
. . . . . . . . .
. . .
61/64
.9531
. . . . . . . . . . . . . . .
31/32
.9688
25 mm = .9843
. . . . . . . . .
. . .
63/64
.9844
. . . . . . . . . . . . . . .
1
1.0
. . . . .
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