National Diamond Laboratory
Manufacturers of Fine Diamond Tooling

4650 Alger Street
Los Angeles, Ca 90039 - Yahoo Map
 


Call Toll Free: 800-898-8665  Local: 818-240-5770 FAX: 818-545-8820    EMAIL
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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