INCONEL® 718 Flange Bolting

INCONEL® encompasses a family of nickel-chromium alloys including INCONEL® 718. 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
FB1-30-7181/2"427330
FB1-45-7181/2"639445
FB1-60-7181/2"854360
FB2-30-7185/8"687660
FB2-45-7185/8"1018890
FB2-60-7185/8"13569120
FB3-30-7183/4"10100100
FB3-45-7183/4"15199150
FB3-60-7183/4"20186200
FB4-30-7187/8"13871160
FB4-45-7187/8"20872240
FB4-60-7187/8"27839320
FB5-30-7181"18338245
FB5-45-7181"27488368
FB5-60-7181"36471490
FB6-30-7181-1/8"23864355
FB6-45-7181-1/8"35649533
FB6-60-7181-1/8"47405710
FB7-30-7181-1/4"30241500
FB7-45-7181-1/4"45306750
FB7-60-7181-1/4"602661000
FB8-30-7181-3/8"37059680
FB8-45-7181-3/8"556561020
FB8-60-7181-3/8"742591360
FB9-30-7181-1/2"44780800
FB9-45-7181-1/2"673491200
FB9-60-7181-1/2"899651600
FB10-30-7181-5/8"534261100
FB10-45-7181-5/8"803981650
FB10-60-7181-5/8"1072582200
FB11-30-7181-3/4"624591500
FB11-45-7181-3/4"937062250
FB11-60-7181-3/4"1248413000
FB12-30-7181-7/8"723052000
FB12-45-7181-7/8"1086793000
FB12-60-7181-7/8"120544 4000
FB13-30-7182"832182200
FB13-45-7182"1251733300
FB13-60-7182"138506 4400
FB14-30-7182-1/4"1071683180
FB14-45-7182-1/4"1606034770
FB14-60-7182-1/4"178209 6360
FB15-30-7182-1/2"1335124400
FB15-45-7182-1/2"2003886600
FB15-60-7182-1/2"222074 8800
FB16-30-7182-3/4"1631815920
FB16-45-7182-3/4"2444368880
FB16-60-7182-3/4"271890 11840
FB17-30-7183"1954017720
FB17-45-7183"29336511580
FB17-60-7183"325801 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