Woodruff key

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English

English Wikipedia has an article on:
Wikipedia
a selection of Woodruff keys and the keyseat cutters that will mill the keyseats for them
a typical Woodruff key, placed next to the keyseat that it will be pressed into

Etymology

Developed by William N. Woodruff of Hartford, Connecticut, in the 1880s, to improve on existing keying practice with more economical keyseat cutting; in the era's technological context, this design offered what is today called a DFM improvement (US patent 368744).

Noun

Woodruff key (plural Woodruff keys)

  1. (engineering) A semicircular key that fits partly into a circular segment keyseat, with the remainder fitting into a longitudinal slot keyway in the mating part.
    Hypernyms: key < part, component