Isitshixo se-Semicircular luhlobo lwesitshixo, indawo yayo ephezulu yinqwelomoya, indawo esezantsi yi-arc semicircular, amacala amabini ahambelanayo, aziwa ngokuba sisitshixo secrescent.Indawo yokusebenza yesitshixo se-semi-circular ngamacala amabini, kwaye i-torque ihanjiswa ngecala.Inokungathathi hlangothi okulungileyo okufanayo njengebhondi ecaba.Isitshixo sinokujikeleza kumbindi we-arc curvature yomgangatho osezantsi wegroove kwi-shaft groove, ukuze ikwazi ukuziqhelanisa ngokuzenzekelayo nokuthambeka komphezulu ongezantsi we-hub keyway.