Overview of Eccentric Bushings for Spring Plungers

Spring plungers are a type of hardware that offers a simple and effective way of positioning parts so that they fit perfectly within an assembly. Consisting of a spring and a ball, they apply pressure to the parts with which they are used, essentially pushing the ball or nose to ensure that the adjacent part is properly positioned. To further assure a perfect fit, eccentric bushings are often employed alongside spring plungers.

What Are Spring Plungers?

Spring plungers are small and narrow devices that can be used for positioning various components. As their name implies, they make use of a spring that applies pressure within the fastener, allowing the ball (found at the end) to remain positioned at all times, regardless of how much pressure is exerted upon it from the opposite end. Most spring plungers consist of three basic components: the plunger, internal compression spring, and threaded body. The threaded body houses the spring while the plunger rests on the end, allowing for accurate force to be exerted.

What Are Eccentric Bushings?

Eccentric bushings are adjustable spacers that are designed for use with spring plungers. Like all bearing bushings, they provide space between parts, but eccentric bushings are unique in that they have an off-center or “eccentric” mounting hole that has a smaller diameter on one side than the other. This special design allows the bushing to create precise mounting clearance. When used alongside a spring plunger, the bushing can isolate it, meaning that the spring plunger will still be able to apply pressure to the adjacent part via its enclosed spring, but the spring plunger will be isolated. Spring plungers alone can position parts, but eccentric bushings offer greater control over positioning since you can use them to adjust the spring plunger itself.

What Type of Spring Plungers Support Eccentric Bushings?

Spring plungers come in many different types with only some of them able to support eccentric bushings. Most often, eccentric bushings are used with lateral spring plungers. Characterized by their ability to apply pressure laterally, lateral spring plungers are well suited for eccentric bushings.

How to Choose Eccentric Bushings

Eccentric bushings come in a variety of shapes and sizes. Since they are designed for use with spring plungers, it is important to choose the size of bushing that matches that of the spring plunger it will support. Otherwise, the two parts may not fit together correctly. Additionally, to accommodate various applications, eccentric bushings are also available in different materials as well. Steel is a popular material because it is highly durable and resistant to corrosion, but an even stronger option is carbon steel, that of which is suited for rugged applications.

Conclusion

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