Recommended Bolt Torque for Class 400 SPWD Gaskets with Inner Ring - Series A

Expired

Recommended minimum Bolt Torque Values for class 400 spiral wound gaskets with inner ring for Series A flanges.
Bolt Torque values are specified in ft-lb and N-m.
Bolt torques are based on design bolt stress of 60 ksi and a nut factor (K factor) of 0.18.

NPS
(in)		 Class 400 Bolt Torque
(ft-lb)		 Bolt Torque
(N-m)
No. of
Bolts		 Bolt
Size
(in)		 Min Max Min Max
26 28 1-3/4 825 3117 1118.5 4226.1
28 28 1-7/8 947 3787 1284.0 5134.5
30 28 2 1086 4342 1472.4 5887.0
32 28 2 1161 4645 1574.1 6297.8
34 28 2 1229 4773 1666.3 6471.3
36 32 2 1138 4551 1542.9 6170.3
38 32 1-3/4 1012 3117 1372.1 4226.1
40 32 1-7/8 1143 3887 1549.7 5270.1
42 32 1-7/8 1198 3887 1624.3 5270.1
44 32 2 1340 4773 1816.8 6471.3
46 36 2 1257 4773 1704.3 6471.3
48 28 2-1/4 1893 6931 2566.6 9397.2
50 32 2-1/4 1723 6892 2336.1 9344.3
52 32 2-1/4 1789 6931 2425.6 9397.2
54 28 2-1/2 2367 9467 3209.2 12835.5
56 32 2-1/2 2145 8578 2908.2 11630.2
58 32 2-1/2 2218 8873 3007.2 12030.2
60 32 2-3/4 2541 10165 3445.1 13781.9

1]  For typical calculation of bolt torque values refer to article: Calculation of Bolt Torque for Flanged Joint Assembly.

2]  Bolt Torque values provided in table above are for guidance only. For actual applied torque values follow gasket vendor recommendations.

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