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Thread: Converting newtons to lbs. per inch

  1. #1
    Associate Engineer
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    Converting newtons to lbs. per inch

    Is there a way to convert ? I want to compare coil springs that are rated in newtons to springs that are rated in pounds per inch of compression. Any ideas? Thanks for reading this.

  2. #2
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    CORRECTION NOTE: When I stated "spring rate must be stated as force/unit length" in the original below post, that statement should have read "spring rate must be stated as force/unit deflection".

    Newtons is a unit of force only and spring rate must be stated as force/unit length; therefore, the metric equivalent of lbs/inch must be newtons/meter or newtons/cm or something of that form. Assuming the metric spring rate is in newtons/cm then straightforward conversions of the units of newtons to lbs and cm to inch should solve your problem.
    Last edited by JAlberts; 10-20-2014 at 06:19 PM. Reason: Terminology error correction

  3. #3
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    Thank you, unfortunately the only spec for this spring is "Newtons".

  4. #4
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    While it does not affect the apparent issue at hand, I mispoke my above entry when I stated "spring rate must be stated as force/unit length". That statement should have read "spring rate must be stated as force/unit deflection".

    I apologize for such an obvious error.

  5. #5
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    Is stating spring force in newtons/cm the customary way to rate a spring in the metric world?

  6. #6
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    A quick check of suppliers on the internet indicates the standard metric unit for spring rate is Newtons/mm.

  7. #7
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    ok, thanks.

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