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  • Plastic to aluminum tolerance fit..

    Ksab Thomas

    Ksab Thomas

    @ksab-iNPUXf
    Updated: Oct 26, 2024
    Views: 1.2K
    Hello, so I have a very simple question for those who have experience making plastic on metal fits:

    I have an frame with aluminum square tube rails (1.5”x1.5”) joined by plastic corners. The frame is not expected to be exposed to high heat but will be stressed and relieved continually.

    What is your best estimation for the tolerance between the (machined) plastic corner inserts and the (extruded) aluminum tubing for a good fit (somewhere between a perfect fit and a very light hammer tap?


    Thank you!
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  • Ramani Aswath

    Member • Apr 29, 2018

    Plastic is a general term. Which is the plastic used? What is the design of the component? A polymer like UHMWHDPE can have a very long fatigue life. However, its mechanical properties are poorer than other engineering polymers. What is the stress seen by the joint?
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