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 IDBolt DiaID (min)OD (max)THK (Nom)OH (Ref)Deflection (Nom)LBS F 100%Torque (Lubricated)Torque (Dry)Bolt Stress (KSI)
AFM10-30-H1310mm0.4100.7180.0850.0940.0092,350121530
AFM10-45-H1310mm0.4100.7180.1040.1110.0073,340162245
AFM10-60-H1310mm0.4100.7180.1190.1260.0074,760233160
AFM12-30-H1312mm0.4880.8540.1030.1140.0113,490212730
AFM12-45-H1312mm0.4880.8540.1250.1340.0095,220314145
AFM12-60-H1312mm0.4880.8540.1440.1520.0086,980415560
AFM14-30-H1314mm0.5670.9950.1200.1320.0124,570314230
AFM14-45-H1314mm0.5670.9950.1460.1560.0106,860476345
AFM14-60-H1314mm0.5670.9950.1680.1770.0099,440658760
AFM16-30-H1316mm0.6441.1480.1420.1570.0156,690537030
AFM16-45-H1316mm0.6441.1480.1730.1850.01210,0807910645
AFM16-60-H1316mm0.6441.1480.2000.2110.01113,71010814460
AFM18-30-H1318mm0.7241.2850.1650.1800.0158,8207810430
AFM18-45-H1318mm0.7241.2850.1990.2120.01313,34011815845
AFM18-60-H1318mm0.7241.2850.2320.2430.01117,98015921260
AFM20-30-H1320mm0.8111.4550.1760.1920.0168,7708611530
AFM20-45-H1320mm0.8111.4550.2140.2280.01413,86013618245
AFM20-60-H1320mm0.8111.4550.2420.2540.01217,16016922560
AFM22-30-H1322mm0.9011.5900.2040.2240.02014,52015721030
AFM22-45-H1322mm0.9011.5900.2480.2650.01721,72023531445
Item IDBolt DiaID (min)OD (max)THK (Nom)OH (Ref)Deflection (Nom)LBS F 100%Torque (Lubricated)Torque (Dry)Bolt Stress (KSI)
AF2250-45-H132 1/42.2814.0400.6860.7250.039159,1204,4755,96745
AF2250-60-H132 1/42.2814.0400.7040.7420.038167,7804,7196,29260
AF2500-30-H132 1/22.5314.4830.6290.6810.052132,3004,1345,51330
AF2500-45-H132 1/22.5314.4830.7660.8090.043198,4606,2028,26945
AF2500-60-H132 1/22.5314.4830.7860.8280.042209,2106,5388,71760
AF2750-30-H132 3/42.7814.9200.6950.7520.057161,5205,5527,40330
AF2750-45-H132 3/42.7814.9200.8470.8940.047242,6308,34011,12145
AF2750-60-H132 3/42.7814.9200.8690.9150.046255,7008,79011,72060
AF3000-30-H1333.0315.3600.7610.8220.061193,6907,2639,68530
AF3000-45-H1333.0315.3600.9270.9780.051290,64010,89914,53245
AF3000-60-H1333.0315.3600.9521.0020.050306,90011,50915,34560
AF3250-30-H133 1/43.3065.8100.7700.8370.067196,8707,99810,66430
AF3250-45-H133 1/43.3065.8100.9801.0330.053322,86013,11617,48845
AF3250-60-H133 1/43.3065.8101.0371.0870.050360,86014,66019,54760
AF3500-30-H133 1/23.5306.1250.8410.9010.060209,3409,15912,21230
AF3500-45-H133 1/23.5306.1251.0241.0800.056351,51015,37920,50545
AF3500-60-H133 1/23.5306.1251.1791.2270.048463,55020,28027,04060
AF3750-30-H133 3/43.8126.6710.8710.9480.077250,59011,74615,66230
AF3750-45-H133 3/43.8126.6711.0621.1260.064377,77017,70823,61145
AF3750-60-H133 3/43.8126.6711.2221.2780.056503,74023,61331,48460
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