Recommended minimum Torque Values are in N-m.
Torque values are applicable for Bolt Materials - ASTM A193 B7, B16 & ASTM A320 L7.

Bolt Torquing

BOLT TORQUING

Flange
NPS
No of
Bolts
Bolt
size
Bolt Stress
(MPa)
Torque N-m
μ=0.09
Copperslip
Torque N-m
μ=0.14
Chesterton
Nickel
Torque N-m
μ=0.225
Unlubricated
½'' 4 ¾ 276 139 203 313
¾'' 4 ¾ 310 156 209 352
1'' 4 310 249 366 565
1¼'' 4 310 249 366 565
1½'' 4 1 310 371 545 842
2½'' 8 1 310 371 545 842
3'' 8 1 ⅛ 345 599 885 1372
4'' 8 1 ¼ 345 835 1240 1929
5'' 8 1 ½ 345 1477 2209 3453
6'' 12 1 ⅜ 310 1014 1511 2356
8'' 12 1 ⅝ 345 1893 2839 4447
10'' 12 1 ⅞ 345 2951 4444 6984
12'' 16 2 345 3599 5430 8545
14'' 16 2 ¼ 345 5161 7813 12321
16'' 16 2 ½ 345 7122 10809 17077
18'' 16 2 ¾ 345 9547 14520 22974
20'' 16 3 345 12431 18940 30005
24'' 16 3 ½ 345 19888 30387 48235

Other articles you may like to read...

Recommended Bolt Torque Requirements...
Recommended Bolt Torque Requirements... Recommended minimum Torque Values are in N-m. Torque values are applicable for Bolt Materials - ASTM A193 B7, B16 & ... Bolt Design 9910 views
Recommended Bolt Torque Requirements...
Recommended Bolt Torque Requirements... Recommended minimum Torque Values are in N-m. Torque values are applicable for Bolt Materials - ASTM A193 B7, B16 & ... Bolt Design 4464 views
Recommended Bolt Torque Requirements...
Recommended Bolt Torque Requirements... Recommended minimum Torque Values are in N-m. Torque values are applicable for Bolt Materials - ASTM A193 B7, B16 & ... Bolt Design 6479 views
Recommended Bolt Torque Requirements...
Recommended Bolt Torque Requirements... Recommended minimum Torque Values are in N-m. Torque values are applicable for Bolt Materials - ASTM A193 B7, B16 & ... Bolt Design 8340 views
Recommended Bolt Torque Requirements...
Recommended Bolt Torque Requirements... Recommended minimum Torque Values are in N-m. Torque values are applicable for Bolt Materials - ASTM A193 B7, B16 & ... Bolt Design 10184 views
Recommended Bolt Torque for Class 30...
Recommended Bolt Torque for Class 30... Recommended minimum Bolt Torque Values for class 300 spiral wound gaskets with inner ring for Series B flanges.Bolt Torq... Bolt Design 473 views