Universal Bolt Torque Values for 1/8" thick Ring Gaskets - ANSI B16.5 Class 300# Flanges
                         
Nominal Raised Face Raised Face Gasket Number Size of Bolt Torque Comp Force Max. Gasket Internal Min. Rec'd Min. Rec'd Max. Rec'd/Avail. Preferred
Pipe Size Contact I.D. Contact O.D. Contact Area Of Bolts at 60ksi Stress Per Bolt @ 60ksi Stress Avail. Pressure Gasket Stress Torque/Bolt Gasket Stress Torque/Bolt
(in) (in) (in) (sq.in.) Bolts (in) (ft.lbs.) (lbs.) (psi) (psig) (psi) (ft.lbs.) (psi) (ft.lbs.)
1/2 0.84 1.38 0.94 4 0.50 60 7560 32134 <800 6200 12 15000 28
3/4 1.06 1.69 1.36 4 0.63 120 12120 35647 <800 6200 21 15000 51
1 1.31 2.00 1.79 4 0.63 120 12120 27041 <800 6400 28 15000 67
1 1/4 1.66 2.50 2.74 4 0.63 120 12120 17673 <800 6400 43 15000 102
1 1/2 1.91 2.88 3.65 4 0.75 200 18120 19872 <800 6400 64 15000 151
2 2.38 3.62 5.84 8 0.63 120 12120 16602 <800 6400 46 15000 108
2 1/2 2.88 4.12 6.81 8 0.75 200 18120 21274 <800 6400 60 15000 141
3 3.50 5.00 10.01 8 0.75 200 18120 14483 <800 6400 88 14483 200
3 1/2 4.00 5.50 11.19 8 0.75 200 18120 12959 <800 6400 99 12959 200
4 4.50 6.19 14.18 8 0.75 200 18120 10221 <800 6400 125 10221 200
5 5.56 7.31 17.68 8 0.75 200 18120 8199 <800 6400 156 8199 200
6 6.62 8.50 22.31 12 0.75 200 18120 9745 <800 6400 131 9745 200
8 8.62 10.62 30.21 12 0.88 320 25140 9987 <800 6400 205 9987 320
10 10.75 12.75 36.90 16 1.00 490 33060 14337 <800 6400 219 14337 490
12 12.75 15.00 49.01 16 1.13 710 43680 14259 <800 6400 319 14259 710
14 14.00 16.25 53.43 20 1.13 710 43680 16351 <800 6600 287 15000 652
16 16.00 18.50 67.71 20 1.25 1000 55740 16465 <800 6600 401 15000 912
18 18.00 21.00 91.85 24 1.25 1000 55740 14565 <800 6400 439 14565 1000
20 20.00 23.00 101.27 24 1.25 1000 55740 13210 <800 6400 484 13210 1000
24 24.00 27.25 130.75 24 1.50 1600 84300 15474 <800 6400 662 15000 1552

This bolt torque table should only to be used as a general guide and should not be used as a sole means of determining bolt loading. Your specific application should not be undertaken without independent study and evaluation.  Failure to properly apply stress to the sealing product could result in property damage and/or serious personal injury.