Torque Chart
TARGET BOLT RESIDUAL STRESS (RAISED FACE FLANGES)

Bolt Material

Nut Material

Yield Stress

Target Bolt Stress (psi)

150#

300#

600#

900#

1500#

2500#

B7

2H

105,000

60,000

60,000

45,000

45,000

35,000

35,000

B7M

2HM

80,000

60,000

60,000

45,000

45,000

35,000

35,000

B16

4

105,000

60,000

60,000

45,000

45,000

35,000

35,000

B8 Cl.2

8

50,000-

100,000

Note 3

Note 3

Note 3

Note 3

35,000

35,000

B8 Cl.1

8

30,000

21,000

21,000

21,000

21,000

21,000

21,000


NOTES:

  1. Target residual stresses apply to standard pipe flanges that are fabricated in accordance with ASME B16.5. Bolt materials listed are per ASME A193.
  2. For non-standard flanges, consult LGT Engineering for target bolt stress and torque values.
  3. B8, Class 2 bolting materials are strain hardened and have different yield strengths depending on bolt diameter. Consult LGT Engineering for target stress.
  4. Consult LGT Engineering for bolt materials not listed.
TORQUE WRENCH SETTINGS

Bolt or Stud Diameter

 

21,000

Bolt Stress

 

35,000

Bolt Stress

 

45,000

Bolt Stress

 

60,000

Bolt Stress

1/4"

2

3

4

6

5/16"

4

7

9

12

3/8"

8

13

16

22

7/16"

12

20

26

35

1/2"

19

31

40

53

9/16"

27

45

58

77

5/8"

37

62

79

106

11/16"

52

87

112

149

3/4"

66

110

141

188

13/16"

90

149

192

256

7/8"

106

177

227

303

15/16"

142

236

304

405

1"

159

265

341

455

1-1/8"

225

376

483

644

1-1/4"

318

530

681

909

1-3/8"

417

695

893

1190

1-1/2"

553

922

1190

1580

1-5/8"

717

1190

1540

2050

1-3/4"

873

1450

1870

2490

1-7/8"

1130

1890

2430

3230

2"

1310

2190

2810

3750

2-1/8"

1690

2820

3620

4830

2-1/4"

1920

3200

4110

5480

2-3/8"

2400

4000

5140

6860

2-1/2"

2630

4380

5630

7500

2-5/8"

3070

5110

6570

8760

2-3/4"

3560

5930

7630

10200

2-7/8"

4110

6840

8800

11700

3"

4700

7840

10100

13400

Notes:

  1. Torque values assume that Nickel Anti-Sieze thread lubricant is used. If bolts are to be torqued "dry", increase wrench setting by 20%.
  2. Table is for standard pipe flanges only. Consult LGT Engineering for flange bolt-up procedure, target bolt stresses, and guidelines for non-standard connections.
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