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)
AFM85-30-H13 85mm 3.390 5.840 0.835 0.896 0.061 231,050 9,665 12,887 30
AFM85-45-H13 85mm 3.390 5.840 1.037 1.086 0.049 356,730 14,922 19,896 45
AFM85-60-H13 85mm 3.390 5.840 1.172 1.216 0.044 462,700 19,355 25,807 60
AFM90-30-H13 90mm 3.573 6.125 0.841 0.901 0.060 211,930 9,387 12,516 30
AFM90-60-H13 90mm 3.573 6.125 1.205 1.252 0.047 487,840 21,607 28,809 60
AFM110-30-H13 110mm 4.400 7.720 1.080 1.164 0.084 388,410 21,026 28,035 30
AFM110-45-H13 110mm 4.400 7.720 1.316 1.386 0.070 583,570 31,591 42,121 45
AFM110-60-H13 110mm 4.400 7.720 1.515 1.575 0.060 765,760 41,454 55,271 60
Item ID Bolt Dia ID (min) OD (max) THK (Nom) OH (Ref) Deflection (Nom) LBS F 100% Torque (Lubricated) Torque (Dry) Bolt Stress (KSI)
AF500-30-H13 1/2 0.515 1.011 0.120 0.133 0.013 4,390 27 37 30
AF500-45-H13 1/2 0.515 1.011 0.141 0.153 0.012 6,600 41 55 45
AF500-60-H13 1/2 0.515 1.011 0.163 0.173 0.010 8,480 53 71 60
AF625-30-H13 5/8 0.644 1.148 0.142 0.157 0.015 6,690 52 70 30
AF625-45-H13 5/8 0.644 1.148 0.173 0.185 0.012 10,080 79 105 45
AF625-60-H13 5/8 0.644 1.148 0.200 0.211 0.011 13,570 106 141 60
AF750-30-H13 3/4 0.773 1.370 0.173 0.190 0.017 9,930 93 124 30
AF750-45-H13 3/4 0.773 1.370 0.211 0.225 0.014 14,980 140 187 45
AF750-60-H13 3/4 0.773 1.370 0.243 0.256 0.013 20,010 188 250 60
AF875-30-H13 7/8 0.901 1.590 0.204 0.224 0.020 13,800 151 201 30
AF875-45-H13 7/8 0.901 1.590 0.248 0.265 0.017 20,670 226 301 45
AF875-60-H13 7/8 0.901 1.590 0.286 0.301 0.015 27,490 301 401 60
AF1000-30-H13 1 1.030 1.810 0.233 0.256 0.023 17,990 225 300 30
AF1000-45-H13 1 1.030 1.810 0.283 0.302 0.019 26,880 336 448 45
AF1000-60-H13 1 1.030 1.810 0.326 0.342 0.016 35,920 449 599 60
AF1125-30-H13 1 1/8 1.155 2.025 0.266 0.291 0.025 23,460 330 440 30
AF1125-45-H13 1 1/8 1.155 2.025 0.323 0.344 0.021 35,030 493 657 45
AF1125-60-H13 1 1/8 1.155 2.025 0.372 0.390 0.018 46,770 658 877 60
AF1250-30-H13 1 1/4 1.281 2.310 0.301 0.330 0.029 30,330 474 632 30
AF1250-45-H13 1 1/4 1.281 2.310 0.376 0.400 0.024 48,030 750 1,001 45
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