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 anawaena, waho anawaena, laula, chamfer nui tolerance a i ʻae ʻia ka waiwai. kaʻaʻe, awelika anawaena apo laula deviation i hoʻokahi radial plane.rotation pololei ka rotating Pendulum, me ke apo i loko a me waho apo radial kowali a me ka axial runout, aoao o loko apo a me waho anawaena ili perpendicularity tolerance range.Bearing precision papa mai laula papa. 0 i ka 6, 5, papa 4 a me ka papa 2, ma ka huli, aia ma lalo ka papaʻaina hoʻohālikelike ma waena o ka papa preeision o Kina GB 307 a me nā maʻamau ʻē aʻe. 

ʻO ke apo o 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 ke kalapona liʻiliʻi, 0.05 mass% a ʻoi aʻe a emi iho ma mua o 0.3 mass% silicon, 0.10 mass% a ʻoi aku paha. a me 0.50 mass% 11 A o na ala heihei apo puka waho a me 12 A o na heihei apo i loko o ka ili o ke kila nona keia manganese, 1.30 ka nui a oi aku, a me 2.00 mass% a emi mai, a o ke kila nona. ʻO ke koena hao a me ka haumia, a me nā hui pū me nā mea ʻē aʻe.A ʻo ka awelika o ka naikokene koʻikoʻi i loko o ka ʻāpana o ka ʻili 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 nui a ʻoi aʻe a me 0.7% ma ka nui a emi mai, a ma ka ʻili. ʻO nā ʻāpana ʻāpana 11B, 12B, 13B, 5 a ʻoi aʻe paha nā carbide me ke anawaena o 0.5 micrometer a i ʻole ka liʻiliʻi i loaʻa i kēlā me kēia 100 micrometer.