Siffar kai-daidaitacce abin nadi bearingsAna amfani da ko'ina a cikin injin takarda, bugu, akwatin gear masana'antu, jigilar kayan, masana'antar ƙarfe, ma'adinai da injiniyan farar hula.
Gabaɗaya magana, saurin aiki naabin nadi kai tsayeyana da ƙananan ƙananan. Dangane da siffar giciye-sashe na abin nadi, ana iya raba shi zuwa nadi mai siffar zobe da asymmetrical spherical roller. Dangane da ko zoben ciki yana da haƙarƙari ko a'a kuma kejin da aka yi amfani da shi, ana iya raba shi zuwa nau'in C da nau'in Ca; Siffofin nau'in nau'in ca sune: bangarorin biyu na zoben ciki suna da haƙarƙari da ƙaƙƙarfan keji da mota ta yi.

TheSiffar kai-daidaitacce abin nadi haliyana da layuka biyu na rollers masu siffar siffa mai ma'ana, zobe na waje yana da hanyar tsere ta gama gari, kuma zobe na ciki yana da hanyoyin tsere guda biyu masu karkata zuwa wani kusurwa tare da axis, wanda ke da kyakkyawan aikin daidaita kai. Lokacin da aka lanƙwasa igiya ko shigarwar ba ta da hankali, ana iya amfani da maƙallan kullum. Ayyukan daidaita kai ya bambanta tare da jerin girman girman. Gabaɗaya, damar da aka ba da izinin daidaita kai shine digiri 1 ~ 2.5
Lokacin auna ma'aunin radial na abin nadi mai daidaitawa da kai, saita motsi a kan dandamali, riƙe zoben waje na bearing da hannu ɗaya, sannan juya zoben ciki na bearing da ɗayan hannun don mayar da rollers ɗin zuwa. matsayinsu na asali, tare da zobe na ciki da kuma ƙarshen fuska na zoben waje a layi daya. Auna jeri na sharewa, kuma auna sharewa tsakanin abin nadi da titin tsere kai tsaye sama da ma'auni tare da ma'aunin ji.