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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