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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.