INCONEL® X-750 Flange Bolting

INCONEL® encompasses a family of nickel-chromium alloys including INCONEL® X-750. These alloys have high strength, weldability, and corrosion resistance at extreme temperature ranges. Temperatures for various applications can range from -400°F to 1300°F, depending on the alloy. (Registered trademark of the Special Metals Corporation)

Help eliminate flange leakage with BelleFlex® INCONEL® Belleville washers. Leaks occur by bolt stretch, gasket creep, cycles of thermal change, etc. However, by maintaining load on bolted joints, leakage is greatly reduced, if not eliminated. 

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 SizeFlat Load
lb
Torque *
ft-lb
FB1-30-7501/2"426030
FB1-45-7501/2"642145
FB1-60-7501/2"864460
FB2-30-7505/8"679160
FB2-45-7505/8"1018290
FB2-60-7505/8"13595120
FB3-30-7503/4"10077100
FB3-45-7503/4"15086150
FB3-60-7503/4"20162200
FB4-30-7507/8"13949160
FB4-45-7507/8"20873240
FB4-60-7507/8"27745320
FB5-30-7501"18236245
FB5-45-7501"27356368
FB5-60-7501"36549490
FB6-30-7501-1/8"23844355
FB6-45-7501-1/8"35553533
FB6-60-7501-1/8"47601710
FB7-30-7501-1/4"30190500
FB7-45-7501-1/4"45019750
FB7-60-7501-1/4"600171000
FB8-30-7501-3/8"37030680
FB8-45-7501-3/8"556091020
FB8-60-7501-3/8"740921360
FB9-30-7501-1/2"45005800
FB9-45-7501-1/2"674321200
FB9-60-7501-1/2"899601600
FB10-30-7501-5/8"537471100
FB10-45-7501-5/8"804451650
FB10-60-7501-5/8"1068412200
FB11-30-7501-3/4"624761500
FB11-45-7501-3/4"936062250
FB11-60-7501-3/4"1251723000
FB12-30-7501-7/8"724462000
FB12-45-7501-7/8"1088553000
FB12-60-7501-7/8"120509 4000
FB13-30-7502"831232200
FB13-45-7502"1250143300
FB13-60-7502"138943 4400
FB14-30-7502-1/4"893733180
FB14-45-7502-1/4"1605014770
FB14-60-7502-1/4"178034 6360
FB15-30-7502-1/2"1332554400
FB15-45-7502-1/2"2004526600
FB15-60-7502-1/2"222656 8800
FB16-30-7502-3/4"1634325920
FB16-45-7502-3/4"2445048880
FB16-60-7502-3/4"272113 11840
FB17-30-7503"1957917720
FB17-45-7503"29343011580
FB17-60-7503"326123 15440

* Torque values for sizes 1-1/8″ and larger are based on the 8-pitch thread series for flanged piping.
† 50,000 psi bolt stress