Flange Washers

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American Belleville’s Flange Washer line adds deflection to bolted joints, in order to dramatically reduce the effects of large fluctuations in temperature within the application, vibration, bolt creep (stretch), gasket creep, or relaxation, and other elastic interactions within the joint. They may be flattened, without losing operating preload, except in cases where dynamic cycling occurs. Typically, at least two American Belleville Flange Washers will be used in a single bolted assembly, with one on either end of the bolt. The ID, on the convex side of the washer should contact the underside of the bolt head and the nut. The OD edge on the concave side of the washer should always contact the flange surface.

American Belleville Flange Washers can be specified by identifying a few characteristics of the application, starting with bolt diameter and bolt stress; the latter calling out either 30,000 psi, 45,000 psi or 60,000 psi. They can be utilized in either inch or metric applications, and are typically made using three different raw material options:

  • H13 Tool Steel (ASTM A681) for refining and chemical flange bolting applications with temperatures reaching over 1000 deg. F, where corrosion resistance is not crucial, but high strength is. This material is fully magnetic.
  • 17/7PH Stainless Steel (ASTM A693) for refining and chemical flange bolting applications reaching 500 deg. F, and where high strength and corrosion resistance is needed. This material is highly magnetic.
  • Inconel 718 (ASTM B670 / AMS 5596) for flange bolting applications reaching over 1000 deg. F. This material is highly corrosion resistant, offers good strength properties and is non-magnetic.

Traditional applications for American Belleville Flange Washers include:

  • Pipe Flanges
  • Heat Exchangers
  • Valves

Low temperature applications (Cryogenic) can also utilize American Belleville Flange Washers

We will work closely with you to specify or design, and then manufacture the proper part for your application. Contact us online or call 440-721-8350.

Flange Washers - Search
Item ID Bolt Dia ID (min) OD (max) THK (Nom) OH (Ref) Deflection (Nom) LBS F 100% Torque (Lubricated) Torque (Dry) Bolt Stress (KSI)
AFM10-30-H13 10mm 0.410 0.718 0.085 0.094 0.009 2,350 12 15 30
AFM10-45-H13 10mm 0.410 0.718 0.104 0.111 0.007 3,340 16 22 45
AFM10-60-H13 10mm 0.410 0.718 0.119 0.126 0.007 4,760 23 31 60
AFM12-30-H13 12mm 0.488 0.854 0.103 0.114 0.011 3,490 21 27 30
AFM12-45-H13 12mm 0.488 0.854 0.125 0.134 0.009 5,220 31 41 45
AFM12-60-H13 12mm 0.488 0.854 0.144 0.152 0.008 6,980 41 55 60
AFM14-30-H13 14mm 0.567 0.995 0.120 0.132 0.012 4,570 31 42 30
AFM14-45-H13 14mm 0.567 0.995 0.146 0.156 0.010 6,860 47 63 45
AFM14-60-H13 14mm 0.567 0.995 0.168 0.177 0.009 9,440 65 87 60
AFM16-30-H13 16mm 0.644 1.148 0.142 0.157 0.015 6,690 53 70 30
AFM16-45-H13 16mm 0.644 1.148 0.173 0.185 0.012 10,080 79 106 45
AFM16-60-H13 16mm 0.644 1.148 0.200 0.211 0.011 13,710 108 144 60
AFM18-30-H13 18mm 0.724 1.285 0.165 0.180 0.015 8,820 78 104 30
AFM18-45-H13 18mm 0.724 1.285 0.199 0.212 0.013 13,340 118 158 45
AFM18-60-H13 18mm 0.724 1.285 0.232 0.243 0.011 17,980 159 212 60
AFM20-30-H13 20mm 0.811 1.455 0.176 0.192 0.016 8,770 86 115 30
AFM20-45-H13 20mm 0.811 1.455 0.214 0.228 0.014 13,860 136 182 45
AFM20-60-H13 20mm 0.811 1.455 0.242 0.254 0.012 17,160 169 225 60
AFM22-30-H13 22mm 0.901 1.590 0.204 0.224 0.020 14,520 157 210 30
AFM22-45-H13 22mm 0.901 1.590 0.248 0.265 0.017 21,720 235 314 45
Item ID Bolt Dia ID (min) OD (max) THK (Nom) OH (Ref) Deflection (Nom) LBS F 100% Torque (Lubricated) Torque (Dry) Bolt Stress (KSI)
AF2250-45-H13 2 1/4 2.281 4.040 0.686 0.725 0.039 159,120 4,475 5,967 45
AF2250-60-H13 2 1/4 2.281 4.040 0.704 0.742 0.038 167,780 4,719 6,292 60
AF2500-30-H13 2 1/2 2.531 4.483 0.629 0.681 0.052 132,300 4,134 5,513 30
AF2500-45-H13 2 1/2 2.531 4.483 0.766 0.809 0.043 198,460 6,202 8,269 45
AF2500-60-H13 2 1/2 2.531 4.483 0.786 0.828 0.042 209,210 6,538 8,717 60
AF2750-30-H13 2 3/4 2.781 4.920 0.695 0.752 0.057 161,520 5,552 7,403 30
AF2750-45-H13 2 3/4 2.781 4.920 0.847 0.894 0.047 242,630 8,340 11,121 45
AF2750-60-H13 2 3/4 2.781 4.920 0.869 0.915 0.046 255,700 8,790 11,720 60
AF3000-30-H13 3 3.031 5.360 0.761 0.822 0.061 193,690 7,263 9,685 30
AF3000-45-H13 3 3.031 5.360 0.927 0.978 0.051 290,640 10,899 14,532 45
AF3000-60-H13 3 3.031 5.360 0.952 1.002 0.050 306,900 11,509 15,345 60
AF3250-30-H13 3 1/4 3.306 5.810 0.770 0.837 0.067 196,870 7,998 10,664 30
AF3250-45-H13 3 1/4 3.306 5.810 0.980 1.033 0.053 322,860 13,116 17,488 45
AF3250-60-H13 3 1/4 3.306 5.810 1.037 1.087 0.050 360,860 14,660 19,547 60
AF3500-30-H13 3 1/2 3.530 6.125 0.841 0.901 0.060 209,340 9,159 12,212 30
AF3500-45-H13 3 1/2 3.530 6.125 1.024 1.080 0.056 351,510 15,379 20,505 45
AF3500-60-H13 3 1/2 3.530 6.125 1.179 1.227 0.048 463,550 20,280 27,040 60
AF3750-30-H13 3 3/4 3.812 6.671 0.871 0.948 0.077 250,590 11,746 15,662 30
AF3750-45-H13 3 3/4 3.812 6.671 1.062 1.126 0.064 377,770 17,708 23,611 45
AF3750-60-H13 3 3/4 3.812 6.671 1.222 1.278 0.056 503,740 23,613 31,484 60
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