ʻO nā mea hoʻoheheʻe helical kekahi ʻano o nā mea hana cylindrical me nā niho helicoid. Hoʻohana ʻia kēia mau hāmeʻa e hoʻouna i ka mana ma waena o nā shaft parallel a i ʻole nā ​​​​mea like ʻole, e hāʻawi ana i ka hana maʻalahi a maikaʻi hoʻi i nā ʻōnaehana mechanical. Hoʻopili ʻia nā niho helical ma ka ʻaoʻao o ke kaʻa ma ke ʻano helix, e hiki ai ke hoʻopili mālie i nā niho, e hopena i ka hana ʻoi aku ka maʻalahi a me ka mālie i ka hoʻohālikelike ʻia me nā spur gears.

Hāʻawi ka Helical gears i nā pono he nui, me ka hiki ke lawe i ka ukana ma muli o ka piʻi ʻana o ka pilina pili ma waena o nā niho, ka hana maʻalahi me ka haʻahaʻa haʻahaʻa a me ka walaʻau, a me ka hiki ke hoʻouna i ka neʻe ma waena o nā kumu like ʻole. Hoʻohana maʻamau ʻia kēia mau mīkini i ka hoʻouna ʻana i nā kaʻa, nā mīkini ʻenehana, a me nā noi ʻē aʻe kahi e pono ai ka hoʻoili mana maʻemaʻe a hilinaʻi.