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Unified Coarse
Thread Form
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- p = Pitch = 1/TPI
- hn = Height of internal thread = 0.54127p
- hs = Height of external thread = 0.61344p
- r = Basic Radius = 0.1443p
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Thread Tables
| Nominal Size |
TPI |
Basic Major Diameter |
Basic Effective Diameter |
Basic Minor Diameter of External Threads |
Basic Minor Diameter of Internal Threads |
Tapping Drill |
Clearance Drill |
| (n/a) |
(n/a) |
(inch) |
(inch) |
(inch) |
(inch) |
(mm) |
(mm) |
| No. 1 |
64 |
0.073 |
0.0629 |
0.0538 |
0.0561 |
1.55 |
1.95 |
| No.2 |
56 |
0.086 |
0.0744 |
0.0641 |
0.0667 |
1.85 |
2.3 |
| No. 3 |
48 |
0.099 |
0.0855 |
0.0734 |
0.0764 |
2.1 |
2.65 |
| No.4 |
40 |
0.112 |
0.0958 |
0.0813 |
0.0849 |
2.35 |
2.95 |
| No. 5 |
40 |
0.125 |
0.1088 |
0.0943 |
0.0979 |
2.65 |
3.3 |
| No.6 |
32 |
0.138 |
0.1177 |
0.0997 |
0.1042 |
2.85 |
3.6 |
| No 8 |
32 |
0.164 |
0.1437 |
0.1257 |
0.1302 |
3.5 |
4.3 |
| No. 10 |
24 |
0.19 |
0.1629 |
0.1389 |
0.1449 |
3.9 |
4.9 |
| No. 12 |
24 |
0.216 |
0.1889 |
0.1649 |
0.1709 |
4.5 |
5.6 |
| 1 4 |
20 |
0.25 |
0.2175 |
0.1887 |
0.1959 |
5.1 |
6.5 |
| 5/16 |
18 |
0.3125 |
0.2764 |
0.2443 |
0.2524 |
6.6 |
8.1 |
| 3/8 |
16 |
0.375 |
0.3344 |
0.2983 |
0.3073 |
8 |
9.7 |
| 7/16 |
14 |
0.4375 |
0.3911 |
0.3499 |
0.3602 |
9.4 |
11.3 |
| 1/2 |
13 |
0.5 |
0.45 |
0.4056 |
0.4167 |
10.8 |
13 |
| 9/16 |
12 |
0.5625 |
0.5084 |
0.4603 |
0.4723 |
12.2 |
14.5 |
| 5/8 |
11 |
0.625 |
0.566 |
0.5135 |
0.5266 |
13.5 |
16.25 |
| 3/4 |
10 |
0.75 |
0.685 |
0.6273 |
0.6417 |
16.5 |
19.25 |
| 7/8 |
9 |
0.875 |
0.8028 |
0.7387 |
0.7547 |
19.5 |
22.5 |
| 1 |
8 |
1 |
0.9188 |
0.8466 |
0.8647 |
22.25 |
25.75 |
| 1,1/8 |
7.00 |
1.125 |
1.0322 |
0.9497 |
0.9704 |
25 |
29 |
| 1,1/4 |
7.00 |
1.25 |
1.1572 |
1.0747 |
1.0954 |
28 |
32 |
| 1,3/8 |
6 |
1.375 |
1.2667 |
1.1705 |
1.1946 |
30.75 |
35.5 |
| 1,1/2 |
6.00 |
1.5 |
1.3917 |
1.2955 |
1.3196 |
34 |
38.5 |
| 1,3/4 |
5 |
1.75 |
1.6201 |
1.5046 |
1.5335 |
39.5 |
45 |
| 2 |
4.50 |
2 |
1.8557 |
1.7274 |
1.7594 |
45 |
51 |
| 2,1/4 |
4.50 |
2.25 |
2.1057 |
1.9774 |
2.0094 |
52 |
58 |
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