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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