Recommended minimum Bolt Torque Values for class 300 spiral wound gaskets Series-B flanges without inner ring.
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 300 Bolt Torque
(ft-lb)
Bolt Torque
(N-m)
No. of
Bolts
Bolt
Size
(in)
Min Max Min Max
26 32 1-1/4 376 1045 509.8 1416.8
28 36 1-1/4 359 1045 486.7 1416.8
30 36 1-3/8 422 1266 572.2 1716.5
32 32 1-1/2 551 1653 747.1 2241.2
34 36 1-1/2 519 1557 703.7 2111.0
36 32 1-5/8 669 2006 907.0 2719.8
38 36 1-5/8 646 1938 875.9 2627.6
40 40 1-5/8 610 1831 827.0 2482.5
42 36 1-3/4 765 2294 1037.2 3110.2
44 40 1-3/4 719 2157 974.8 2924.5
46 36 1-7/8 895 2686 1213.5 3641.7
48 40 1-7/8 1053 3158 1427.7 4281.7
50 44 1-7/8 793 2378 1075.2 3224.1
52 48 1-7/8 754 2263 1022.3 3068.2
54 48 1-7/8 1035 3106 1403.3 4211.2
56 36 2-1/4 1524 4571 2066.3 6197.4
58 40 2-1/4 1216 3649 1648.7 4947.4
60 40 2-1/4 1369 4107 1856.1 5568.3

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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