Recommended Bolt Torque for Class 600 SPWD Gaskets with Inner Ring - Series A

Expired

Recommended minimum Bolt Torque Values for class 600 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 600 Bolt Torque
(ft-lb)		 Bolt Torque
(N-m)
No. of
Bolts		 Bolt
Size
(in)		 Min Max Min Max
26 28 1-7/8 884 3534 1198.5 4791.5
28 28 2 1010 4039 1369.4 5476.1
30 28 2 1086 4342 1472.4 5887.0
32 28 2-1/4 1306 5226 1770.7 7085.5
34 28 2-1/4 1382 5529 1873.7 7496.3
36 28 2-1/2 1625 6501 2203.2 8814.2
38 28 2-1/4 1515 6059 2054.1 8214.9
40 32 2-1/4 1400 5600 1898.1 7592.6
42 28 2-1/2 1872 7489 2538.1 10153.7
44 32 2-1/2 1721 6885 2333.4 9334.8
46 32 2-1/2 1795 7179 2433.7 9733.4
48 32 2-3/4 2065 8261 2799.8 11200.4
50 28 3 2676 10704 3628.2 14512.7
52 32 3 2430 9719 3294.6 13177.2
54 32 3 2529 10117 3428.9 13716.8
56 32 3-1/4 2836 11343 3845.1 15379.0
58 32 3-1/4 2943 11774 3990.2 15963.4
60 28 3-1/2 3755 15021 5091.1 20365.7

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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