fifth wheel - circular metal plate, secured to the chassis frame, which engages the semi-trailer kingpin and allows the semi-trailer to pivot ; king pin - a vertical bolt under the front part of a trailer body, which locks into the jaws of the fifth wheel to secure the trailer to the tractor
vetotappi 1 . EKI terminibaas Esterm. Eesti Keele Instituut, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/vetotappi/1/fin (18.07.2026)
