Cov yeeb nkab steel tuaj yeem muab faib ua cov yeeb nkab du ( yeeb nkab kawg yam tsis muaj xov) thiab xov xa cov yeeb nkab ( yeeb nkab kawg nrog xov) raws li kev sib txuas ntawm cov yeeb nkab kawg.
Cov yeeb nkab threading tau muab faib ua cov yeeb nkab zoo tib yam threading thiab thickened threading yeeb nkab ntawm cov yeeb nkab kawg.
Thickened threading kav kuj tuaj yeem muab faib ua sab nraud (nrog cov xov sab nraud), sab hauv (nrog xov hauv) thiab sab hauv thiab sab nraud (nrog rau sab hauv thiab sab nraud) threading kav.
Cov yeeb nkab threading kuj tuaj yeem muab faib ua cov cylindrical zoo tib yam los yog cov xov tapered thiab cov xov tshwj xeeb threading yeeb nkab raws li hom xov. Tsis tas li ntawd, raws li tus neeg siv xav tau, cov yeeb nkab threading feem ntau xa nrog cov yeeb nkab sib txuas.
