Cryogenic 17-7 PH® Flange Bolting

With large temperature differences seen in cryogenic applications, the use of Belleville disc springs can play a significant role in the reduction of leaks. Materials with good cryogenic properties are PH (precipitation hardening) and Carpenter Technology stainless steels.

The load values listed in the table below are according to the calculated theoretical load curve based on the dimensions and material for each part number.

Part NumberBolt SizeOD
in
ID
in
Thick
in
Dish
in
Height
in
Flat Load
lb
Torque *
ft-lb
FB1-15-71/2"0.9260.5130.0860.0150.101219215
FB1-25-71/2"0.9260.5130.1090.0120.121357125
FB2-15-75/8"1.1490.6410.1060.0190.125339730
FB2-25-75/8"1.1490.6410.140.0140.154576651
FB3-15-73/4"1.3710.7360.130.0220.152508551
FB3-25-73/4"1.3710.7360.1680.0170.185848185
FB4-15-77/8"1.5910.8920.1530.0250.178703981
FB4-25-77/8"1.5910.8920.1980.0190.21711594134
FB5-15-71"1.8111.0210.1750.0280.2039147123
FB5-25-71"1.8111.0210.2250.0220.24715275206
FB6-15-71-1/8"2.0261.1460.1990.0310.2311933179
FB6-25-71-1/8"2.0261.1460.2570.0240.28119899298
FB7-15-71-1/4"2.3111.2710.2250.0360.26115040251
FB7-25-71-1/4"2.3111.2710.290.0280.31825046417
FB8-15-71-3/8"2.4711.4010.250.0360.28618508340
FB8-25-71-3/8"2.4711.4010.3230.0280.35131046571
FB9-15-71-1/2"2.6811.5250.2760.0380.31422395400
FB9-25-71-1/2"2.6811.5250.3540.030.38437305667
FB10-15-71-5/8"2.9531.6520.3010.0430.34426709550
FB10-25-71-5/8"2.9531.6520.390.0330.42344585918
FB11-15-71-3/4"3.1721.7780.3250.0460.37131222751
FB11-25-71-3/4"3.1721.7780.4220.0350.457520071250
FB12-15-71-7/8"3.3921.9010.3520.0480.4361931001
FB12-25-71-7/8"3.3921.9010.4550.0370.492602541667
FB13-15-72"3.6012.030.3780.050.428416321102
FB13-25-72"3.6012.030.4870.0390.526694441838
FB14-15-72-1/4"4.0412.2820.4270.0560.483534531592
FB14-25-72-1/4"4.0412.2820.5530.0430.596891552655
FB15-15-72-1/2"4.4842.5290.4790.0610.54666832203
FB15-25-72-1/2"4.4842.5290.620.0470.6671114173680
FB16-15-72-3/4"4.9212.7810.5310.0660.597817482971
FB16-25-72-3/4"4.9212.7810.6860.0510.7371362054950
FB17-15-73"5.3913.0310.580.0720.652979603872
FB17-25-73"5.3913.0310.7470.0560.8031627736434

* Torque values for sizes 1-1/8″ and larger are based on the 8-pitch thread series for flanged piping.