ʻO nā bearings huila pahu lālani hoʻokahi me ka hale paʻa i loko o nā huila cylindrical i hoʻopaʻa ʻia ma waena o kahi apo paʻa waho a me loko. ʻO kēia mau bearings kahi kiʻekiʻe o ka rigidity, hiki ke kākoʻo i nā ukana radial kaumaha a kūpono i nā wikiwiki kiʻekiʻe. Hiki ke hoʻopili kaʻawale ʻia nā apo o loko a me waho, e hana ana i ka hoʻonohonoho ʻana a me ka wehe ʻana i kahi hana maʻalahi.
ʻO ke apo o waho o ka NUP cylindrical bearing he ʻelua iwi ʻaoʻao paʻa, ʻoiai ʻo ke apo o loko o ka bearing cylindrical he hoʻokahi iwi ʻaoʻao paʻa a hoʻokahi iwi ākea. 'O ia ho'i, hiki i ka NUP cylindrical bearing ke axially loa'a ke kumu ma nā 'ao'ao 'elua.