shaft - any long straight part, eg a revolving rod that transmits motion in vehicle engines, spindle - a rod, usually of iron or other metal, serving as an axis upon which, or by means of which, something revolves or is turned round, laagritele toetuv pöörlev masinaelement, mis kannab üle pöördemomenti (erinevalt teljest, mis pöördemomenti üle ei kanna) ja toetab temale paigaldatud detaile (hammas-, rihma, hoo- jm rattaid, sidureid jms).