The nkenke nke bearing nwere nkenke na n'usoro accuaracy akụkụ nkenke bụ oru ngo nke na-arị elu na aro, ọ na-agụnye n'ime dayameta, n'èzí dayameta, obosara, chamfer size ndidi ma ọ bụ kwere value.Geometric ziri ezi gụnyere dayameta deviation, nkezi n'ime dayameta deviation, si n'akụkụ dayameta deviation, nkezi dayameta mgbanaka obosara deviation na otu radial planeting inrotation nke mgbanaka bụ Pennerdull ziri ezi na n'ime otu radial planeting. swing na axial runout, Akụkụ nke n'ime mgbanaka na mpụta dayameta elu perpendicularity ndidi range.Bearing ziri ezi ọkwa si general ọkwa 0 ka 6, 5, ọkwa 4 na ọkwa 2, N'aka nke ya, n'okpuru bụ table ntụnyere n'etiti preeision klas nke china GB 307 na ndị ọzọ nkenke ọkọlọtọ.Giant grades bụ site na ọkwa anọ nke ọkwa 5 na ọkwa 2. akara ule. 

Mgbanaka mpụta 11, mgbanaka n'ime 12, na bọọlụ 13 nke na-ebu ihe bụ 0.95 mass% ma ọ bụ karịa na 1.10 uka% ma ọ bụ obere carbon, 0.05 mass% ma ọ bụ karịa na ihe na-erughị 0.3 mass% silicon, 0.10 mass% ma ọ bụ karịa na 0.50 mass% 2 A nke ụzọ mgbanaka n'elu. nke nwere nchara nke nwere manganese ndị a, 1.30% ma ọ bụ karịa, na 2.00 mass% ma ọ bụ obere, ma mejupụtara ígwè nke nwere ígwè fọdụrụnụ na adịghị ọcha, na kọntaktị na ihe ndị ọzọ. Na nkezi nitrogen ịta na n'elu oyi akwa mpaghara 11B, 12B, na 13B nke bụ mpaghara n'ime a omimi nke 20 μm si bọl Rolling elu 13A bụ 0.2% site uka ma ọ bụ karịa na 0.7% site uka ma ọ bụ obere, na n'elu oyi akwa mpaghara 11B, 12B, 13B, 5 ma ọ bụ karịa micrometer-0. micrometer.