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Threads Types and
Drill Sizes |
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Metric
Coarse |
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BSW Thread |
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Thread |
Pitch |
Tapping |
Clearance |
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Thread |
Threads |
Tapping |
Clearance |
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Size |
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Drill Size |
Drill Size |
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Size |
Per Inch |
Drill Size |
Drill Size |
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2.0 |
0.40 |
1.65 |
2.05 |
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1/8 |
40 |
2.55 |
3.30 |
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3.0 |
0.50 |
2.55 |
3.10 |
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3/16 |
24 |
3.70 |
5.00 |
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4.0 |
0.70 |
3.40 |
4.10 |
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1/4 |
20 |
5.10 |
6.50 |
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5.0 |
0.80 |
4.30 |
5.10 |
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5/16 |
18 |
6.50 |
8.00 |
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6.0 |
1.00 |
5.10 |
6.10 |
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3/8 |
16 |
7.90 |
9.80 |
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8.0 |
1.25 |
6.90 |
8.20 |
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7/16 |
14 |
9.50 |
11.60 |
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10.0 |
1.50 |
8.60 |
10.20 |
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1/2 |
12 |
10.50 |
13.10 |
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12.0 |
1.75 |
10.20 |
12.20 |
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9/16 |
12 |
12.10 |
14.75 |
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16.0 |
2.00 |
14.25 |
16.25 |
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5/8 |
11 |
13.50 |
16.50 |
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20.0 |
2.50 |
17.50 |
20.25 |
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3/4 |
10 |
16.25 |
19.50 |
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24.0 |
3.00 |
21.00 |
24.25 |
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7/8 |
9 |
19.25 |
22.75 |
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27.0 |
3.00 |
24.00 |
27.25 |
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1 |
8 |
22.00 |
26.00 |
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30.0 |
3.50 |
26.50 |
30.50 |
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1 1/8 |
7 |
24.75 |
29.00 |
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33.0 |
3.50 |
29.50 |
33.50 |
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1 1/4 |
7 |
27.50 |
32.20 |
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36.0 |
4.00 |
32.00 |
36.50 |
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1 1/2 |
6 |
33.50 |
38.00 |
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39.0 |
4.00 |
35.00 |
39.50 |
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1 3/4 |
5 |
39.00 |
48.20 |
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42.0 |
4.50 |
37.50 |
42.50 |
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2 |
4 1/2 |
44.50 |
51.00 |
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45.0 |
4.50 |
40.50 |
45.50 |
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BSP
Threads |
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UNC |
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Thread |
Threads |
Tapping |
Clearance |
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Thread |
Threads |
Tapping
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Clearance |
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Size |
Per Inch |
Drill Size |
Drill Size |
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Size |
Per Inch |
Drill Size |
Drill Size |
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1/8 |
28.0 |
8.75 |
9.80 |
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1/4 |
20.0 |
5.20 |
6.50 |
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1/4 |
19.0 |
11.80 |
10.40 |
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5/16 |
18.0 |
6.60 |
8.00 |
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3/8 |
19.0 |
15.25 |
17.25 |
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3/8 |
16.0 |
8.10 |
9.80 |
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1/2 |
14.0 |
19.00 |
21.25 |
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7/16 |
14.0 |
9.50 |
11.60 |
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5/8 |
14.0 |
21.00 |
23.25 |
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1/2 |
13.0 |
10.80 |
13.05 |
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3/4 |
14.0 |
24.50 |
26.55 |
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9/16 |
12.0 |
12.25 |
14.60 |
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7/8 |
14.0 |
28.25 |
30.50 |
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5/8 |
11.0 |
13.50 |
16.35 |
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1 |
11.0 |
30.75 |
33.30 |
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3/4 |
10.0 |
16.50 |
19.40 |
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1 1/4 |
11.0 |
39.50 |
42.00 |
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7/8 |
9.0 |
19.50 |
22.60 |
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1 1/2 |
11.0 |
45.00 |
48.00 |
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1 |
8.0 |
22.25 |
25.80 |
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1 3/4 |
11.0 |
51.00 |
54.00 |
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1 1/8 |
7.0 |
25.00 |
28.90 |
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2 |
11.0 |
57.00 |
60.00 |
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1 1/4 |
7.0 |
28.15 |
32.10 |
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1 3/8 |
6.0 |
31 |
35.40 |
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1 1/2 |
6.0 |
34.00 |
38.50 |
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1 3/4 |
5.0 |
39.20 |
47.90 |
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2 |
4 1/2 |
45.00 |
51.00 |
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BSF Threads |
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UNF Threads |
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Thread |
Threads |
Tapping
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Clearance |
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Thread |
Threads |
Tapping
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Clearance |
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Size |
Per Inch |
Drill Size |
Drill Size |
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Size |
Per Inch |
Drill Size |
Drill Size |
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1/4 |
26.0 |
5.30 |
6.50 |
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1/4 |
28 |
5.50 |
6.50 |
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5/16 |
22.0 |
6.75 |
8.00 |
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5/16 |
24 |
6.90 |
8.00 |
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3/8 |
20.0 |
8.25 |
9.80 |
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3/8 |
24 |
8.50 |
9.80 |
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7/16 |
18.0 |
9.70 |
11.60 |
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7/16 |
20 |
10.00 |
11.55 |
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1/2 |
16.0 |
11.15 |
13.05 |
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1/2 |
20 |
11.50 |
13.05 |
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9/16 |
16.0 |
12.60 |
14.60 |
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9/16 |
18 |
12.80 |
14.06 |
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5/8 |
14.0 |
14.00 |
16.35 |
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5/8 |
18 |
14.50 |
16.35 |
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3/4 |
12.0 |
16.50 |
19.40 |
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3/4 |
16 |
17.50 |
19.40 |
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7/8 |
11.0 |
19.50 |
22.60 |
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7/8 |
14 |
20.50 |
22.60 |
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1 |
10.0 |
22.50 |
25.80 |
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1 |
12 |
23.50 |
25.80 |
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1 1/8 |
9.0 |
25.50 |
28.90 |
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1 1/8 |
12 |
26.50 |
28.90 |
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1 1/4 |
9.0 |
28.50 |
32.10 |
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1 1/4 |
12 |
29.50 |
32.10 |
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1 3/8 |
8.0 |
31.50 |
35.40 |
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1 3/8 |
12 |
33.00 |
35.40 |
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1 1/2 |
8.0 |
34.50 |
38.50 |
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1 1/2 |
12 |
36.00 |
38.50 |
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