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TORQUE REQUIRED TO PRODUCE
BOLT STRESS Torque Data For Use With Alloy
Steel Stud Bolts
Load
in pounds on stud bolt when torque loads are applied.
|
Nominal
Diameter
OF Bolt
(Inches) |
Number
of
Threads
(per Inch) |
Diameter
At Root
Of Thread
(Inches) |
Area
At Root
Of Thread
Sq. Inch |
STRESS |
| 30,000psi |
45,000psi |
60,000psi |
|
Torque
Ft/Lbs |
Compression
Lbs |
Torque
Ft/Lbs |
Compression
Lbs |
Torque
Ft/Lbs |
Compression
Lbs |
| 1/4 |
20 |
.185 |
.027 |
4 |
810 |
6 |
1215 |
8 |
1620 |
| 5/16 |
18 |
.240 |
.045 |
8 |
1350 |
12 |
2025 |
16 |
2700 |
| 3/8 |
16 |
.294 |
.068 |
12 |
2040 |
18 |
3060 |
24 |
4080 |
| 7/16 |
14 |
.345 |
.093 |
20 |
2790 |
30 |
4185 |
40 |
5580 |
| 1/2 |
13 |
.400 |
.126 |
30 |
3780 |
45 |
5670 |
60 |
7560 |
| 9/16 |
12 |
.454 |
.162 |
45 |
4860 |
68 |
7290 |
90 |
9720 |
| 5/8 |
11 |
.507 |
.202 |
60 |
6060 |
90 |
9090 |
120 |
12120 |
| 3/4 |
10 |
.620 |
.302 |
100 |
9060 |
150 |
13590 |
200 |
18120 |
| 7/8 |
9 |
.731 |
.419 |
160 |
12570 |
240 |
18855 |
320 |
25140 |
| 1 |
8 |
.838 |
.551 |
245 |
16530 |
368 |
24795 |
490 |
33060 |
| 1 1/8 |
8 |
.963 |
.728 |
355 |
21840 |
533 |
32760 |
710 |
43680 |
| 1 1/4 |
8 |
1.088 |
.929 |
500 |
27870 |
750 |
41805 |
1000 |
55740 |
| 1 3/8 |
8 |
1.213 |
1.155 |
680 |
34650 |
1020 |
51975 |
1360 |
69300 |
| 1 1/2 |
8 |
1.338 |
1.405 |
800 |
42150 |
1200 |
63225 |
1600 |
84300 |
| 1 5/8 |
8 |
1.463 |
1.680 |
1100 |
50400 |
1650 |
75600 |
2200 |
100800 |
| 1 3/4 |
8 |
1.588 |
1.980 |
1500 |
59400 |
2250 |
89100 |
3000 |
118800 |
| 1 7/8 |
8 |
1.713 |
2.304 |
2000 |
69120 |
3000 |
103680 |
4000 |
138240 |
| 2 |
8 |
1.838 |
2.652 |
2200 |
79560 |
3300 |
119340 |
4400 |
159120 |
| 2 1/4 |
8 |
2.088 |
3.423 |
3180 |
102690 |
4770 |
154035 |
6360 |
205380 |
| 2 1/2 |
8 |
2.338 |
4.292 |
4400 |
128760 |
6600 |
193140 |
8800 |
257520 |
| 2 3/4 |
8 |
2.588 |
5.259 |
5920 |
157770 |
8880 |
236655 |
11840 |
315540 |
| 3 |
8 |
2.838 |
6.324 |
7720 |
189720 |
11580 |
284580 |
15440 |
379440 |
The table above
reflects the results of many tests to determine the relation between torque
and bolt stress. Values are based on
steel bolting
well lubricated with a heavy graphite and oil mixture.
Reprinted with permission of
Crane Co. (Page 383 Crane No. 60 Valve Catalog).
RETURN TO STUD BOLTS
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