What Are Belleville Washers?
A Belleville washer is a conical-shaped spring washer designed with a central hole and a unique ability to produce nonlinear force-deflection behavior. These washers serve two primary purposes:
- Preventing fasteners from loosening under vibration
- Absorbing shock to protect assemblies from damage
- Maintaining clamping force in a bolted joint, as mating components expand and contract during temperature fluctuations (Differential Thermal Expansion), thereby reducing or eliminating bolt stretch or bolt creep.
- Components of a stack that acts as a spring actuating device where loads are high, and space is limited, in dynamically loaded spring applications. These can be used where helical coil springs are not practical, or cannot be designed to work within the design parameters indicated. Also may be utilized where either progressive or regressive load/deflection curves are needed.
Their spring-like geometry allows them to flatten under load, efficiently distributing stress and absorbing vibration. Compared to flat washers, Belleville designs provide superior resilience and recovery, making them invaluable in environments with constant thrust, temperature fluctuations, or high mechanical stress—such as machinery, pipe flanges, and heavy-duty equipment.
Purpose of a Belleville Washer Stack
A single washer can handle impressive pressure, but for applications requiring greater force or flexibility, a Belleville washer stack or disc spring stack becomes essential. By stacking multiple washers in specific configurations, engineers can fine-tune load and deflection characteristics to meet exact performance requirements.
Using a stack design calculator or engineering guide, the number of washers and stacking method can be customized to significantly increase load-bearing or deflection potential. Each configuration has a precise ratio of load to deflection designed for specialized mechanical performance.
How To Stack Belleville Washers
Although there are countless ways to configure washer stacks, most are variations of three basic stacking methods:
#1 Parallel Stacking
All washers are oriented in the same direction. This configuration increases load capacity but not deflection. Each additional washer multiplies load to a degree—though friction reduces efficiency beyond four washers.
#2 Series Stacking
Washers face opposite directions, creating spring gaps that expand deflection capacity without raising load. The total deflection equals the sum of each washer’s deflection—ideal where flexibility is critical.
For instance, if the deflection of a single spring series was .025 inches, the deflection of a triple spring series would be .075 inches.
#3 Parallel/Series Stack
Combining both parallel and series stacks achieves the best of both worlds—greater load and increased deflection. Engineers often use custom disc spring stack arrangements to suit precise machinery requirements.
American Belleville: Precision-Engineered Washers for Demanding Applications
At American Belleville, each washer is manufactured from high-quality materials and tested to handle extreme conditions—from deep cold (-400°F) to high heat (1,100°F) and corrosive environments.
Our Belleville and disc spring stacks deliver consistent, reliable performance in compact designs. Whether you need a high-load Belleville washer stack assembly or a custom spring solution, our engineering expertise ensures every product exceeds expectations.
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