Also referred to as Belleville Washers, Disc Springs, Spring Washers, Conical Washers, Cupped Spring Washers, or Conical Spring Washers
Used to apply a flexible pre-load to a bolted joint or bearing
Corrosion resistant phosphor bronze
Can be used in a stack below the bolt head to apply a greater pre-load
Variety of uses including vibration reduction and pressure indicators
Commonly used in automotive applications, aerospace, firearms and general machinery
Conical Belleville washers are used primarily to add pre-load to a nut and bolt assembly. When placed under the head of the bolt, they add a layer of force between the bolt head and the installation surface. This serves as a resistance to vibration to prevent accidental loosening, which is why these washers are commonly found on automobiles, airplanes, and heavy machinery.
All dimensions are in inches. Ranges indicate minimum and maximum dimensions. Nominal loads are in pounds.
Size
Inner Diameter
Outer Diameter
Thickness
Overall Height
Nominal Load (lbs)
1/4"
.258 to .263
.555 to .563
.038 to .044
.060 to .070
290
5/16"
.322 to .327
.678 to .688
.048 to .053
.075 to .089
500
3/8"
.386 to .392
.801 to .813
.058 to .066
.090 to .110
700
1/2"
.515 to .523
1.170 to 1.188
.089 to .097
.140 to .160
1,600
5/8"
.644 to .654
1.480 to 1.500
.120 to .130
.170 to .190
3,100
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Belleville Conical Washers - OverviewAll About Washers - Types & Materials, USS vs SAE
