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.

Belleville Washer                       Disc washer

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.

Not finding what you’re looking for? Try:

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)
AF1250-45-H13 1 1/4 1.281 2.310 0.376 0.400 0.024 48,030 750 1,001 45
AF1250-60-H13 1 1/4 1.281 2.310 0.422 0.443 0.021 60,840 951 1,268 60
AF1313-30-718 1 5/16 1.345 2.370 0.325 0.344 0.019 33,000 541.4 ft/lbs 722 ft/lbs 30
AF1375-250-177 1 3/8 1.406 2.470 0.250 0.278 0.031 25,000 430 570 20
AF1375-30-H13 1 3/8 1.406 2.470 0.332 0.362 0.030 36,630 630 839 30
AF1375-45-H13 1 3/8 1.406 2.470 0.404 0.429 0.025 54,910 944 1,258 45
AF1375-60-H13 1 3/8 1.406 2.470 0.465 0.487 0.022 73,210 1,258 1,678 60
AF1500-225-718 1 1/2 1.531 2.680 0.225 0.260 0.035 20,000 375 ft/lbs 500 ft/lbs
AF1500-250-177 1 1/2 1.531 2.680 0.250 0.281 0.034 26,000 488 650 18
AF1500-30-H13 1 1/2 1.531 2.680 0.364 0.396 0.032 44,010 825 1,100 30
AF1500-45-H13 1 1/2 1.531 2.680 0.443 0.470 0.027 65,970 1,237 1,649 45
AF1500-60-H13 1 1/2 1.531 2.680 0.510 0.533 0.023 87,990 1,650 2,200 60
AF1625-262-177 1 5/8 1.649 2.950 0.262 0.299 0.037 27,000 548 731 15
AF1625-30-H13 1 5/8 1.649 2.950 0.400 0.435 0.035 53,570 1,088 1,451 30
AF1625-468-177 1 5/8 1.649 2.950 0.468 0.490 0.022 92,000 1,870 2,490 50
AF1625-45-H13 1 5/8 1.649 2.950 0.487 0.516 0.029 80,390 1,633 2,177 45
AF1625-60-H13 1 5/8 1.649 2.950 0.560 0.586 0.026 106,970 2,173 2,897 60
AF1750-280-177 1 3/4 1.774 3.170 0.280 0.323 0.043 31,000 678 904 15
AF1750-30-H13 1 3/4 1.774 3.170 0.432 0.470 0.038 62,480 1,367 1,822 30
AF1750-45-H13 1 3/4 1.774 3.170 0.526 0.557 0.031 93,760 2,051 2,735 45
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