Too Tight or Perfect Fit? When to Use Press Fits in Your Assemblies
Written by
Christian Brown

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May 9, 2017

Press fits adapt to many situations, hold parts in perfect alignment,and are easily introduced but form a lasting bond—you might be wondering why they don’t replace all other connections. However, press fits aren’t for every application. In our latest Hardware Guide post, we talk about the key aspects of press fits and when they are right for your application.

press fits
In calculating holding force for press fits, also think about the press size needed for assembly.

In this article, we examine various aspects of press fit usage and situations in which they're the best choice:

  • We explain why press fits aren’t the right choice for plastic.
  • We calculate force in interference fits to determine how to use press fits properly in an application.
  • We cover tolerances and alignment restrictions.
  • We review similar materials and thermal restrictions.
  • We explain overconstraint and alternative joints.

While press fits are right for some designs, like machined parts of similar materials, with tight tolerances requiring close-tolerance alignment, using an interference fit may not be right for your assembly. Check out our latest Hardware Guide post to figure out when press fits are the best choice for your project.

Written by
Christian Brown
Design engineer & entrepreneur, passionate about technical challenges, great design and extended travel. Currently riding a motorcycle from Alaska to Argentina.
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