Definition of feather key
in machinery
: a sunk key without taper that is permanently fixed in one of the connected pieces and that is a sliding fit in a keyway in the other so as to permit relative longitudinal motion
— called also spline
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“Feather key.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/feather%20key. Accessed 20 Apr. 2021.
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