National Diamond Laboratory
Manufacturers of Fine Diamond Tooling
4650 Alger Street
Los Angeles, Ca 90039 - Yahoo Map
 
  
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REFERENCE TABLES - TAP DRILL SIZES For Fractional Size Threads            Article Index Here    Print Page
Approximately 65% Depth of Thread 
AMERICAN NATIONAL THREAD FORM

TAP SIZE
THREADS
PER INCH
HOLE
DIAMETER
DRILL
TAP SIZE
THREADS
PER INCH
HOLE
DIAMETER
DRILL
1/16
1/16
1/16
5/64
5/64
5/64
5/64
3/32
3/32
3/32
3/32
7/64
7/64
7/64
1/8
1/8
1/8
1/8
9/64
9/64
9/64
5/32
5/32
5/32
11/64
11/64
3/16
3/16
3/16
3/16
13/64
13/64
13/64
7/32
7/32
7/32
15/64
15/64
15/64
1/4
1/4
1/4
1/4
1/4
5/16
5/16
5/16
5/16
5/16
3/8
3/8
3/8
3/8
7/16
7/16
7/16
7/16
1/2
1/2
72
64
60
72
64
60
56
60
56
50
48
56
50
48
48
40
36
32
40
36
32
40
36
32
36
32
36
32
30
24
32
30
24
32
28
24
32
28
24
32
28
27
24
20
32
27
24
20
18
27
24
20
16
27
24
20
14
27
24
.049
.047
.046
.065
.063
.062
.061
.077
.076
.074
.073
.092
.090
.089
.105
.101
.098
.095
.116
.114
.110
.132
.129
.126
.145
.141
.161
.157
.155
.147
.173
.171
.163
.188
.184
.178
.204
.200
.194
.220
.215
.214
.209
.201
.282
.276
.272
.264
.258
.339
.334
.326
.314
.401
.397
.389
.368
.464
.460
3/64
3/64
56
52
1/16
1/16
53
5/64
48
49
49
42
43
43
36
38
40
3/32
32
33
35
30
30
1/8
27
9/64
20
22
23
26
17
11/64
20
12
13
16
6
8
10
7/32
3
3
4
7
9/32
J
I
17/64
F
R
Q
21/64
5/16
Y
X
25/64
U
15/32
29/64
1/2
1/2
1/2
9/16
9/16
9/16
5/8
5/8
5/8
5/8
11/16
11/16
3/4
3/4
3/4
3/4
13/16
13/16
7/8
7/8
7/8
7/8
7/8
15/16
15/16
1
1
1
1
1-1/16
1-1/8
1-1/8
1-3/16
1-1/4
1-1/4
1-5/16
1-3/8
1-3/8
1-1/2
1-1/2
1-5/8
1-3/4
1-7/8
2
2-1/8
2-1/4
2-3/8
2-1/2
2-5/8
2-3/4
2-7/8
3
3-1/8
3-1/4
3-3/8
3-1/2
3-5/8
3-3/4
4
20
13
12
27
18
12
27
18
12
11
16
11
27
16
12
10
12
10
27
18
14
12
9
12
9
27
14
12
8
8
12
7
7
12
7
7
12
6
12
6
5-1/2
5
5
4-1/2
4-1/2
4-1/2
4
4
4
4
3-1/2
3-1/2
3-1/2
3-1/2
3-1/4
3-1/4
3-1/4
3
3
.451
.425
.419
.526
.508
.481
589
.571
.544
.536
.627
.599
.714
.689
.669
.653
.731
.715
.839
.821
.805
.794
.767
.856
.829
.964
.930
.919
.878
.941
1.044
.986
1.048
1.169
1.111
1.173
1.294
1.213
1.419
1.338
1.448
1.555
1.680
1.783
1.909
2.034
2.131
2.256
2.381
2.506
2.597
2.722
2.847
2.972
3.075
3.200
3.325
3.425
3.675
29/64
27/64
27/64
17/32
33/64
31/64
19/32
37/64
35/64
17/32
5/8
19/32
23/32
11/16
43/64
21/32
47/64
23/32
27/32
53/64
13/16
51/64
49/64
55/64
53/64
31/32
15/16
59/64
7/8
15/16
1-3/64
63/64
1-3/64
1-11/64
1-7/64
1-11/64
1-19/64
1-7/32
1-27/64
1-11/32
1-29/64
1-9/16
1-11/16
1-25/32
1-29/32
2-1/32
2-1/8
2-1/4
2-3/8
2-1/2
2-19/32
2-23/32
2-27/32
2-31/32
3-1/16
3-3/16
3-5/16
3-7/16
3-11/16

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