When to use Belleville washers?

High Loads in Small Spaces

When your compression spring application requires a high load in small spaces, Lee Spring's Belleville Disc Washers can be the solution. Their conical configuration enables them to support high loads with relatively small deflections and solid heights compared to helical springs. Belleville Washers are often used to solve vibration, thermal expansion, relaxation and bolt creep problems.

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Lee Spring Standard Series Belleville Disc Washers are manufactured from 300 Series Stainless Steel. Additionally, Lee Spring Standard Series Belleville Disc Washers are passivated in accordance with specification ASTM A967 (supercedes QQ-P35) to remove contaminants and further improve resistance to corrosion. 300 Series Stainless Steel is slightly magnetic and is recommended for applications with temperatures up to 500°F (260 °C).

The Lee Spring DIN Belleville Disc Washer Series offers metric disc spring washers to meet global demand for sizes specified by DIN .  Lee Spring also expand on size options past DIN &#;s standard size tables, made to DIN manufacturing and quality specifications to provide component flexibility for product designers. DIN Belleville Disc Washers are made with 51CrV4 spring steel (AISI ) and finished with a phosphate and oil surface for general protection from corrosion. 

DIN Belleville Disc Washer Series designs are classified into three groups based on the material thickness:

Group 1 &#; This range applies to disc spring washers with material thickness less than 1.25mm.  Lee Spring DIN Belleville Disc Washer Series include 88 sizes in Group 1, over a selection of outside diameters from 6mm (0.236&#;) to 40mm (1.575&#;) with inside diameters from 3.2mm (0.126&#;) to 20.4mm (0.803&#;).

Group 2 &#; This range applies to disc spring washers with material thickness from 1.25mm through 6mm.  Lee Spring DIN Belleville Disc Washer Series include 161 sizes in Group 2, over a selection of outside diameters from 20mm (0.787&#;) to 200mm (7.874&#;) with inside diameters from 10.2mm (0.402&#;) to 102mm (4.016&#;).

Group 3 &#; This range applies to disc spring washers with material thickness over 6mm through 14mm.  Lee Spring DIN Belleville Disc Washer Series include 41 sizes in Group 3, over a selection of outside diameters from 100mm (3.937&#;) to 250mm (9.843&#;) with inside diameters from 51mm (2.008&#;) to 127mm (5.000&#;).

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Should I Stack Belleville Washers?

A single Belleville washer provides specific load and deflection, while stacking two or more conical spring washers creates an increase in load and deflection. Remember, while spring washers are very versatile and can be stacked in several different configurations, the conical washer that is placed against the installation must always have the widest footprint of all the washers. Common methods of stacking disc springs include:

Parallel Stack

In a parallel stack, washers are all placed in the same direction. The deflection does not increase with this stack, but each added washer increases the load capacity of the stack.

Series Stack

In a series stack, conical washers are placed from top to bottom so that they create a gap in the middle. This stack does not increase the load capacity of the fastener assembly, but it can greatly increase the deflection of the stack by adding a spring-like effect to the washers.

Parallel/Series Stack

A mixed parallel/series stack is when both types of stacks are included in a single fastener assembly. This stack increases both the deflection and load capacity of the assembly and can be arranged to suit almost any application.

How Do I Install a Belleville Washer?

We recommend following these steps when installing Belleville washers:

1. Determine the project load capacity and deflection.
2. Choose the plating/finish options to ensure proper resistance to environmental elements that would otherwise affect performance and longevity.
3. Decide which washer stack will give you the optimal results.
4. Slide the washers onto a bolt in the optimal stack, with the cupped spring washers facing down.
5. Slide the bolt through the installation material with the stack pressing against the installation material. Remember, the base washer must be the widest washer in the stack.
6. Tighten the bolt against the other side of the installation material.
7. If reusing a Belleville washer in a separate application, be sure to inspect it for damage before reuse.

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