National Diamond Laboratory
Manufacturers of Fine Diamond Tooling
4650 Alger Street
Los Angeles, Ca 90039 - Google Map
  
 *Product pricing on our website catalog
IS NOT CURRENT.
Please call 1-800-898-8665 for current pricing.
Toll Free: 800-898-8665  Local: 818-240-5770  FAX: 818-545-8820   Email Us Here
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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