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When to Use Press Fit Fittings in your Assemblies

Sheet of steelPress fits have excellent features that make them almost replace all the connections available today. Ranging from keeping parts in perfect alignment to creating a lasting bond, press fits adapt to nearly all situations. However, the truth is, press fits are not a perfect fit for all applications.

This article describes the major aspects of press fits, whether they are good enough for your application.

Do not use them on plastic

Press fit and plastics are a bad idea. This is because press fits depend on friction and stress. In that case, if you press a pin into a plastic hole, the plastic will remain constantly strained which eventually causes the stress and the friction to disappear.

In the end, the press fit becomes useless as it loses or even breaks hence not serving the purpose.

Thermal restriction of similar materials

This is yet another rule of Mother Nature. It is common sense that everything shrinks in the cold, however, everything shrinks at a different rate and up to a certain degree. This is most critical in designing press fits for a given systems.

Ensure that you use like materials if the parts are bound to experience temperature variations. This will ensure that the materials experience similar thermal expansion.

Alignment and tolerance restrictions

Minimal Interference equals massive force. The axial holding power is not just for holding the parts of the system together but also the power needed for assembly.

That means you will have to be extremely cautious when selecting the particular press fit fitting or put the hydraulic press at the danger of breaking.

As seen above, press fit fittings are perfect for machines with close tolerance alignment, tight tolerance or machines parts that are made of similar materials. If your machine is in another category, you can try other alternatives or source for help from press fit fittings manufacturers and suppliers.

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