Recommended Bolt Torque - Class 400 SPWD Gaskets Series A

Expired

Recommended minimum Bolt Torque Values for class 400 spiral wound gaskets Series-A 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 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 2474 1118.5 3354.3
28 28 1-7/8 947 2840 1284.0 3850.5
30 28 2 1086 3257 1472.4 4415.9
32 28 2 1161 3484 1574.1 4723.7
34 28 2 1229 3686 1666.3 4997.5
36 32 2 1138 3413 1542.9 4627.4
38 32 1-3/4 1012 3035 1372.1 4114.9
40 32 1-7/8 1143 3428 1549.7 4647.7
42 32 1-7/8 1198 3593 1624.3 4871.5
44 32 2 1340 4020 1816.8 5450.4
46 36 2 1257 3770 1704.3 5111.4
48 28 2-1/4 1893 5680 2566.6 7701.0
50 32 2-1/4 1723 5169 2336.1 7008.2
52 32 2-1/4 1789 5368 2425.6 7278.0
54 28 2-1/2 2367 7100 3209.2 9626.3
56 32 2-1/2 2145 6434 2908.2 8723.3
58 32 2-1/2 2218 6654 3007.2 9021.6
60 32 2-3/4 2541 7624 3445.1 10336.8

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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