ʻO ka pololei o ka lawe ʻana i ka precision a me ka rotating accuaracy ana precision he papahana e kau ana ma luna o nā kumu, e komo pū ana i loko o ke anawaena, waho anawaena, laula, chamfer nui tolerance a i ʻae ʻia ka waiwai. outer apo radial swing a me ka axial runout, aoao o ka loko apo a me ka waho anawaena ili perpendicularity tolerance range.Bearing precision papa mai laula papa 0 a 6, 5, papa 4 a me ka papa 2, ma ka huli, ma lalo ka papaʻaina hoʻohālikelike ma waena o preeision papa o Kina GB 307 a me kekahi precision standard.Giant amo precision papa 4. 

ʻO ke apo i waho 11, ka apo i loko 12, a me ka poepoe 13 e lawe ana i nā ʻāpana he 0.95 mass% a ʻoi aʻe a me 1.10 mass% a i ʻole ka liʻiliʻi carbon, 0.05 mass% a ʻoi aʻe a emi iho ma mua o 0.3 mass% silikon, 0.10 mass% a ʻoi aʻe a me 0.50 mass% a i ʻole 12 A o ke apo o waho a me ka heihei o waho 12 A. ʻO ka ʻili o ke kila i loaʻa i ka manganese, 1.30 mass% a ʻoi aku paha, a me 2.00 mass% a i ʻole ka liʻiliʻi, a ʻo ke kila he koena hao a me kahi haumia, a me nā hui pū me nā mea ʻē aʻe. A ʻo ka awelika o ka naikokene koʻikoʻi ma ka ʻaoʻao papa o ka ʻāina 11B, 12B, a me 13B ʻo ia nā ʻāpana i loko o ka hohonu o 20 μm mai ka ʻili o ka poepoe 13A he 0.2% ma ka nuipa a ʻoi aʻe a me 0.7% ma ka nui a i ʻole ka liʻiliʻi, a ma ka ʻaoʻao o nā ʻāpana he 11B, 12B, 13B a i ʻole ke anawaena o ke kaʻa. no 100 micrometer.