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Proof Load Using Threaded Mandrel - Inch Series Of A194 / A194M
NOTE : Proof Load are not design loads.
Nominal Size,in . |
Threads per Inch |
Stress Area in. |
Proof Load , l bf |
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Grade 1 |
Grades 2,2HM,6,6F,7M |
Grades 2H,3,4,7,16 |
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Heavy Hex |
Hex |
Heavy Hex |
Hex |
Heavy Hex |
Hex |
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1/4 |
20 |
0.0316 |
4130 |
3820 |
4770 |
4300 |
5570 |
4770 |
5/16 |
18 |
0.0524 |
6810 |
6290 |
7860 |
7070 |
9170 |
7860 |
3/8 |
16 |
0.0774 |
10080 |
9300 |
11620 |
10460 |
13560 |
11620 |
7/16 |
14 |
0.1063 |
13820 |
12760 |
15940 |
14350 |
18600 |
15940 |
1/2 |
13 |
0.1419 |
18450 |
17030 |
21280 |
19160 |
24830 |
21280 |
9/16 |
12 |
0.182 |
23660 |
21840 |
27300 |
24570 |
31850 |
27300 |
5/8 |
11 |
0.226 |
29380 |
27120 |
33900 |
30510 |
39550 |
33900 |
3/4 |
10 |
0.334 |
43420 |
40080 |
50100 |
45090 |
58450 |
50100 |
7/8 |
9 |
0.462 |
60060 |
55440 |
69300 |
62370 |
80850 |
69300 |
1 |
8 |
0.606 |
78780 |
72720 |
90909 |
81810 |
106000 |
90900 |
1 1/8 |
8 |
0.790 |
102700 |
94800 |
118500 |
106700 |
138200 |
118500 |
1 1/4 |
8 |
1.000 |
130000 |
120000 |
150000 |
135000 |
175000 |
150000 |
1 3/8 |
8 |
1.233 |
160200 |
148000 |
185000 |
166500 |
215800 |
185000 |
1 1/2 |
8 |
1.492 |
194000 |
170040 |
223800 |
201400 |
261100 |
223800 |
All Types of Grade 8,Grades 9C and 9CA
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Nominal Size,in. |
Threads per Inch |
Stress Area in. |
Proof Load , lbf |
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Heavy Hex |
Hex |
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| 1/4 | 20 | 0.0316 | 2540 | 2380 |
| 5/16 | 18 | 0.0524 | 4190 | 3930 |
| 3/8 | 16 | 0.0774 | 6200 | 5810 |
| 7/16 | 14 | 0.1063 | 8500 | 7970 |
| 1/2 | 13 | 0.1419 | 11350 | 10640 |
| 9/16 | 12 | 0.182 | 14560 | 13650 |
| 5/8 | 11 | 0.226 | 18080 | 16950 |
| 3/4 | 10 | 0.334 | 26720 | 25050 |
| 7/8 | 9 | 0.462 | 36960 | 34650 |
| 1 | 8 | 0.606 | 48480 | 45450 |
| 1 1/8 | 8 | 0.790 | 63200 | 59250 |
| 1 1/4 | 8 | 1.000 | 80000 | 75000 |
| 1 3/8 | 8 | 1.233 | 98640 | 92450 |
| 1 1/2 | 8 | 1.492 | 119360 | 111900 |