The following information should be used only as a guide. While accurate, these results are based on ideal weld environments containing no imperfections or outside influences that are known to affect welds (such as lubrication, finish, steel strength, etc).
| Thread Size |
Thread Dia. (in) |
TPI |
META (in2) |
Yield Load (Lbs) |
Ultimate Load (Lbs) |
Yield Torque (Inch_Lbs) |
Ultimate Torque (Inch Lbs) |
Yield PSI (min) |
Ultimate PSI (min) |
Mild Steel
| #4 |
0.1120 |
40 |
0.006 |
211 |
332 |
5 |
7 |
35000 |
55000 |
| #6 |
0.1380 |
32 |
0.009 |
318 |
500 |
9 |
14 |
35000 |
55000 |
| #8 |
0.1640 |
32 |
0.014 |
490 |
7700 |
16 |
25 |
35000 |
55000 |
| #10 |
0.1900 |
24 |
0.018 |
614 |
964 |
23 |
37 |
35000 |
55000 |
| #10 |
0.1900 |
32 |
0.020 |
700 |
1100 |
27 |
42 |
35000 |
55000 |
| 1/4 |
0.2500 |
20 |
0.032 |
1114 |
1750 |
56 |
88 |
35000 |
55000 |
| 5/16 |
0.3125 |
18 |
0.052 |
1835 |
2884 |
115 |
180 |
35000 |
55000 |
| 3/8 |
0.3750 |
16 |
0.077 |
2712 |
4264 |
203 |
320 |
35000 |
55000 |
Stainless Steel
| #4 |
0.1120 |
40 |
0.006 |
181 |
452 |
4 |
10 |
30000 |
75000 |
| #6 |
0.1380 |
32 |
0.009 |
273 |
681 |
8 |
19 |
30000 |
75000 |
| #8 |
0.1640 |
32 |
0.014 |
420 |
1051 |
14 |
34 |
30000 |
75000 |
| #10 |
0.1900 |
24 |
0.018 |
526 |
1315 |
20 |
50 |
30000 |
75000 |
| #10 |
0.1900 |
32 |
0.020 |
600 |
1500 |
23 |
5 |
30000 |
75000 |
| 1/4 |
0.2500 |
20 |
0.032 |
955 |
2387 |
48 |
119 |
30000 |
75000 |
| 5/16 |
0.3125 |
18 |
0.052 |
1573 |
3932 |
98 |
246 |
30000 |
75000 |
| 3/8 |
0.3750 |
16 |
0.077 |
2325 |
5812 |
174 |
436 |
30000 |
75000 |
Aluminum 1100
| #4 |
0.1120 |
40 |
0.006 |
121 |
127 |
3 |
3 |
20000 |
21000 |
| #6 |
0.1380 |
32 |
0.009 |
182 |
191 |
5 |
5 |
20000 |
21000 |
| #8 |
0.1640 |
32 |
0.014 |
280 |
294 |
9 |
10 |
20000 |
21000 |
| #10 |
0.1900 |
24 |
0.018 |
351 |
368 |
13 |
14 |
20000 |
21000 |
| #10 |
0.1900 |
32 |
0.020 |
400 |
420 |
15 |
16 |
20000 |
21000 |
| 1/4 |
0.2500 |
20 |
0.032 |
636 |
668 |
32 |
33 |
20000 |
21000 |
Aluminum 5356/5154
| #4 |
0.1120 |
40 |
0.006 |
175 |
241 |
4 |
5 |
29000 |
40000 |
| #6 |
0.1380 |
32 |
0.009 |
263 |
363 |
7 |
10 |
29000 |
40000 |
| #8 |
0.1640 |
32 |
0.014 |
406 |
560 |
13 |
18 |
29000 |
40000 |
| #10 |
0.1900 |
24 |
0.018 |
508 |
701 |
19 |
27 |
29000 |
40000 |
| #10 |
0.1900 |
32 |
0.020 |
580 |
800 |
22 |
30 |
29000 |
40000 |
| 1/4 |
0.2500 |
20 |
0.032 |
923 |
1273 |
46 |
64 |
29000 |
40000 |
| 5/16 |
0.3125 |
18 |
0.052 |
1520 |
2097 |
95 |
131 |
29000 |
40000 |
*Torque figures based on the assumption that excessive deformation of the thread has not taken relationship between torque/tension out of its proportional range. |
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