Tap Drill Chart

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Tap & Drill Chart
STANDARD
Tap Drill
Clearance Drill
Tap & Clearance Drill Sizes
75% Thread for
50% Thread for
Screw
Major
Threads
Minor
Close Fit
Free Fit
Aluminum, Brass
Steel, Stainless
Size
Diameter
Per Inch
Diameter
& Plastics
& Iron
Drill Size Dec. Eq. Drill Size Dec. Eq. Drill Size Dec. Eq. Drill Size Dec. Eq.
0
0.060
80
0.045
3/64
0.047
55
0.052
52
0.064
50
0.070
64
0.054
53
0.060
1/16
0.063
1
0.073
48
0.076
46
0.081
72
0.056
53
0.060
52
0.064
56
0.064
50
0.070
49
0.073
2
0.086
43
0.089
41
0.096
64
0.067
50
0.070
48
0.076
48
0.073
47
0.079
44
0.086
3
0.099
37
0.104
35
0.110
56
0.077
45
0.082
43
0.089
40
0.081
43
0.089
41
0.096
4
0.112
32
0.116
30
0.129
48
0.086
42
0.094
40
0.098
40
0.094
38
0.102
7/64
0.109
5
0.125
30
0.129
29
0.136
44
0.097
37
0.104
35
0.110
32
0.100
36
0.107
32
0.116
6
0.138
27
0.144
25
0.150
40
0.107
33
0.113
31
0.120
32
0.126
29
0.136
27
0.144
8
0.164
18
0.170
16
0.177
36
0.130
29
0.136
26
0.147
24
0.139
22
0.157
20
0.161
10
0.190
9
0.196
7
0.201
32
0.152
21
0.159
18
0.170
24
0.165
16
0.177
12
0.189
12
0.216
2
0.221
1
0.228
28
0.172
14
0.182
10
0.194
32
0.178
13
0.185
9
0.196
20
0.189
7
0.201
7/32
0.219
1/4
0.250
28
0.206
3
0.213
1
0.228
F
0.257
H
0.266
32
0.212
7/32
0.219
1
0.228
18
0.244
F
0.257
J
0.277
5/16
0.313
P
0.323
Q
0.332
24
0.261
I
0.272
9/32
0.281
32
0.274
9/32
0.281
L
0.290
16
0.298
5/16
0.313
Q
0.332
3/8
0.375
24
0.324
Q
0.332
S
0.348
W
0.386
X
0.397
32
0.337
11/32
0.344
T
0.358
14
0.350
U
0.368
25/64
0.391
7/16
0.438
29/64
0.453
15/32
0.469
20
0.376
25/64
0.391
13/32
0.406
28
0.394
Y
0.404
Z
0.413
13
0.406
27/64
0.422
29/64
0.453
1/2
0.500
20
0.439
29/64
0.453
15/32
0.469
33/64
0.516
17/32
0.531
28
0.456
15/32
0.469
15/32
0.469
12
0.460
31/64
0.484
33/64
0.516
9/16
0.563
37/64
0.578
19/32
0.594
18
0.494
33/64
0.516
17/32
0.531
24
0.511
33/64
0.516
17/32
0.531
11
0.514
17/32
0.531
9/16
0.563
5/8
0.625
18
0.557
37/64
0.578
19/32
0.594
41/64
0.641
21/32
0.656
24
0.574
37/64
0.578
19/32
0.594
11/16
0.688
24
0.636
41/64
0.641
21/32
0.656
45/64
0.703
23/32
0.719
10
0.627
21/32
0.656
11/16
0.688
3/4
0.750
49/64
0.766
25/32
0.781
16
0.673
11/16
0.688
45/64
0.703
20
0.689
45/64
0.703
23/32
0.719
20
0.751
49/64
0.766
25/32
0.781
53/64
0.828
27/32
0.844
13/16
0.813
9
0.739
49/64
0.766
51/64
0.797
7/8
0.875
57/64
0.8906
29/32
0.9062
14
0.787
13/16
0.813
53/64
0.828
20
0.814
53/64
0.828
27/32
0.844
15/16
0.938
20
0.876
57/64
0.891
29/32
0.906
61/64
0.953
31/32
0.969
8
0.847
7/8
0.875
59/64
0.922
1
1
12
0.898
15/16
0.938
61/64
0.953
1-1/64
1.0156
1-1/32
1.0313
20
0.939
61/64
0.953
31/32
0.969

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