Are there any design guides or existing studies that provide recommendations for the spring force (e.g. initial force [lb, kg] and force increase [lb/in, kg/mm]) of a physical momentary push button that provides comfortable use but also a "well-built" feel (for an adult with normal finger function)?

The buttons I have in mind would be about the size of a finger tip, and directly control quick-release mechanical latching clips (so you'd press, then probably hold for ~1 second while manipulating the device), with about 3.5mm travel. They're printed parts, and I need to find some springs to put behind them but there's a huge range of options.

1 Answer 1


I suggest that you look into ergonomic standards and tables and find the one that fits your use case the best. For example, this is from Cummins Corp

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But other sources say that the recommended force shouldn't exceed 3 lbs (Ergoweb)

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Or even 2 lbs (same site, different context).

  • 1
    Oh amazing, thank you so much for this; and for some good search keywords. I knew it was out there somewhere.
    – Jason C
    Feb 13, 2022 at 6:16

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