Recommended Bolt Torque Requirements for Class 300 Ring Type Joint Gaskets

Expired

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 ½ 276 40 59 90
¾'' 4 ⅝ 276 79 116 178
1'' 4 ⅝ 276 79 116 178
1¼'' 4 ⅝ 276 79 116 178
1½'' 4 ¾ 276 139 203 313
2'' 8 ⅝ 276 79 116 178
2½'' 8 ¾ 276 139 203 313
3'' 8 ¾ 276 139 203 313
4'' 8 ¾ 276 139 203 313
5'' 8 ¾ 310 156 229 352
6'' 12 ¾ 310 156 229 352
8'' 12 ⅞ 310 249 366 565
10'' 16 1 276 330 485 748
12'' 16 1 ⅛ 276 479 708 1098
14'' 20 1 ⅛ 276 479 708 1098
16'' 20 1 ¼ 276 668 992 1543
18'' 24 1 ¼ 276 668 992 1543
20'' 24 1 ¼ 310 752 1116 1736
24'' 24 1 ½ 310 1329 1988 3108
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