Ama-forging shaft wegiya ngokuya ngokuma kwe-eksisi, i-shaft ingahlukaniswa ibe yi-crankshaft kanye ne-straight shaft izigaba ezimbili. Ngokusho komthamo wokuthwala we-shaft, ingahlukaniswa futhi ibe:
(1) Umphini ojikelezayo, lapho usebenza, uthwala kokubili umzuzu ogobayo kanye netorque. Iwumphini ovame kakhulu emishinini, njenge-shaft kwizinciphisi ezihlukahlukene.
(2) i-mandrel, esetshenziselwa ukusekela izingxenye ezijikelezayo kuphela zithwala isikhathi sokugoba futhi zingadluliseli i-torque, ukujikeleza okuthile kwe-mandrel, njenge-shaft yemoto yesitimela, enye i-mandrel ayizungezi, njenge-pulley shaft esekelayo, njll.
(3) i-drive shaft, esetshenziswa kakhulu ukudlulisa i-torque ngaphandle komzuzu ogobayo, njengomphini omude womshini we-crane ohambayo, umshini wokushayela wemoto, njll.