Bolt Stress to Bolt Torque Conversion Tables
Nominal
Diameter of Bolt (inches)
1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8
1 1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 1-7/8
2
Bolt Stress to Bolt Torque Conversion Tables
Load on Machine Bolts and Cold Rolled Steel Stud Bolts Under Torque
Number
of Threads Per Inch
20 18 16 14 13 12 11 10
9 8 7 7 6 6 5-1/2 5 5 4-1/2
Diameter
of Root of Thread (inches)
0.185 0.240 0.294 0.345 0.400 0.454 0.507 0.620 0.731 0.838 0.939 1.064 1.158 1.283 1.389 1.490 1.615 1.711
Area
at Root of Thread (sq. in.)
0.027 0.045 0.068 0.093 0.126 0.162 0.202 0.302 0.419 0.551 0.693 0.890 1.054 1.294 1.515 1.744 2.049 2.300
7,500 psi
Torque (ft. lbs.)
Clamping Force
(lbs./bolt)
1
203
2
338
3
510
5
698
8
945
12
1,215
15
1,515
25
2,265
40
3,143
62
4,133
98
5,190
137
6,675
183
7,905
219
9,705
300
11,363
390
13,080
525
15,368
563
17,250
Stress
15,000 psi
Clamping Torque Force (ft. lbs.) (lbs./bolt)
2
405
4
675
6
1,020
10
1,395
15
1,890
23
2,430
30
3,030
50
4,530
80
6,285
123
8,265
195
10,380
273
13,350
365
15,810
437
19,410
600
22,725
775
26,160
1,050
30,735
1,125
34,500
30,000 psi
Torque (ft. lbs.)
Clamping Force
(lbs./bolt)
4
810
8
1,350
12
2,040
20
2,790
30
3,780
45
4,860
60
6,060
100
9,060
160
12,570
245
16,530
390
20,760
545
26,700
730 875 1,200
31,620 38,820 45,450
1,550
52,320
2,100
61,470
2,250
69,000
Nominal
Diameter of Bolt (inches)
1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8
1 1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 1-7/8
2 2-1/4 2-1/2 2-3/4
3
Number
of Threads Per Inch
20 18 16 14 13 12 11 10
9 8 8 8 8 8 8 8 8 8 8 8 8 8
Load on Alloy Steel Stud Bolts Under Torque
Diameter
of Root of Thread (inches)
0.185 0.240 0.294 0.345 0.400 0.454 0.507 0.620 0.731 0.838 0.963 1.088 1.213 1.338 1.463 1.588 1.713 1.838 2.088 2.338 2.588 2.838
Area
at Root of Thread (sq. in.)
0.027 0.045 0.068 0.093 0.126 0.162 0.202 0.302 0.419 0.551 0.728 0.929 1.155 1.405 1.680 1.980 2.304 2.652 3.423 4.292 5.259 6.324
30,000 psi
Clamping Torque Force (ft. lbs.) (lbs./bolt)
4
810
8
1,350
12
2,040
20
2,790
30
3,780
45
4,860
60
6,060
100
9,060
160
12,570
245
16,530
355
21,840
500
27,870
680
34,650
800
42,150
1,100
50,400
1,500
59,400
2,000
69,120
2,200
79,560
3,180
102,690
4,400 5,920 7,720
128,760 157,770 189,720
Stress
45,000 psi
Clamping
Torque
Force
(ft. lbs.) (lbs./bolt)
6
1,215
12
2,025
18
3,060
30
4,185
45
5,670
68
7,290
90
9,090
150
13,590
240
18,855
368
24,795
533
32,760
750 1,020 1,200
41,805 51,975 63,225
1,650
75,600
2,250
89,100
3,000
103,680
3,300
119,340
4,770
154,035
6,600 8,800 11,580
193,140 236,655 284,580
60,000 psi
Torque (ft. lbs.)
Clamping Force
(lbs./bolt)
8
1,620
16
2,700
24
4,080
40
5,580
60
7,560
90
9,720
120
12,120
200
18,120
320
25,140
490
33,060
710
43,680
1,000 1,360 1,600
55,740 69,300 84,300
2,200
100,800
3,000
118,800
4,000 138,240
4,400
159,120
6,360 205,380
8,800 11,840 15,440
257,520 315,540 379,440
These tables are for reference only. See torque tables for recommended installation torques. Values shown in these tables are based on steel bolting that has been well-lubricated with heavy graphite and oil mixture. Research has shown
that a non-lubricated bolt has about 50% of the efficiency of a well-lubricated bolt. It has been further found that different lubricants produce results varying between the limit of 50% and 100% of the tabulated stress figures.
C-45
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