ʻO ka mīkini wili hydraulic he ʻano paʻa a kūpono hoʻi a maʻalahi ke hana.Ke hele nei ka pā metala ma nā ʻōwili hana ʻekolu o ka mīkini ʻōwili papa, me ke kōkua o ke kaomi haʻahaʻa o ka ʻōwili luna a me ka neʻe ʻana o ka ʻōwili haʻahaʻa, hoʻomau mau ʻia ka pā metala i nā ala he nui, e hopena i ka deformation plastic mau loa. , a'ōwiliʻia i loko o nā cylinders, arcs, cones Tubes a me nā mea hana'ē aʻe, me ka pololei machining kiʻekiʻe a me ka hana kiʻekiʻe.Hoʻohana ka mīkini ʻōwili hydraulic i kahi ʻōnaehana hydraulic i hoʻohui ʻia e hōʻoia i ka hilinaʻi kiʻekiʻe o ka mīkini paʻa paʻa hydraulic rolling machine i ka hana.