The precision of bearing rine precision and rotating accuracy dimension precision ipurojekiti inokwira pamashafts, inosanganisira mukati dhayamita, kunze dhayamita, hupamhi, chamfer size tolerance kana kubvumirwa kukosha.Geometric accuracy includ diameter deviation, avhareji yemukati dhayamita kutsauka, kunze divi dhayamita kutsauka, plane dhiyamita mhete upamhi kutsauka ari single rotating pepuru. mhete yemukati uye yekunze mhete radial swing uye axial runout, Rutivi rwemhete yemukati uye yekunze dhayamita pamusoro perpendicularity tolerance range.Bearing precision giredhi kubva kune general giredhi 0 kusvika 6, 5, giredhi 4 uye giredhi 2, zvakare, pazasi pane tafura kuenzanisa pakati preeision kirasi yechina GB grade 307 uye imwe giant giant 5 4 uye 2 mazinga emagiredhi mana. 

Mhete yekunze 11, ring yemukati 12, uye bhora 13 izvo zvinotakura zvikamu 0.95 mass% kana kudarika uye 1.10 mass% kana kushoma kabhoni, 0.05 mass% kana kupfuura uye isingasviki 0.3 mass% silicon, 0.10 mass% kana kudarika uye 0,50 massive% 12 nzira dzemukati dzemujaho wemhete A. nzvimbo ine simbi ine manganese anotevera, 1.30 mass% kana kupfuura, uye 2.00 mass% kana zvishoma, uye ine simbi inoumbwa nesimbi yasara uye kusachena, uye kubata nezvimwe zvinoriumba. Uye avhareji yenitrogen iri munzvimbo dzepamusoro 11B, 12B, uye 13B dzinova matunhu ari mukati mehudzamu hwe20 μm kubva pabhora rinokunguruka pamusoro 13A i0.2% nekuwanda kana kudarika uye 0.7% nehuremu kana kushomeka, uye munzvimbo dzepamusoro matunhu 11B, 12B, 13B, 13B dhayamita kana kupfuura makirogiramu mashanu padhayamita imwe chete ne5,5 kana kupfuura. 100 micrometer.