Ukhiye we-semicircular uwuhlobo lwesihluthulelo, indawo yayo engaphezulu iyindiza, indawo engezansi iyi-arc eyi-semicircular, izinhlangothi ezimbili ziyahambisana, ezivame ukubizwa ngokuthi ukhiye we-crescent.Indawo yokusebenza yokhiye we-semi-circular izinhlangothi ezimbili, futhi i-torque idluliselwa eceleni.Inokungathathi hlangothi okuhle okufanayo njengesibopho esiyisicaba.Ukhiye ungashwiba phakathi nendawo yokugoba kwe-arc yendawo engaphansi ye-groove ku-shaft groove, ukuze ukwazi ukuzivumelanisa ngokuzenzakalelayo nokutshekiswa kwendawo engezansi yokhiye wehabhu.