Q1327 hnyav yeeb nkab threading tshuab dhos tshuab yog tsuas yog siv los tig cov xov sab hauv thiab sab nraud nrog rau metric thiab ntiv tes xov, nrog rau muaj tag nrho cov haujlwm ntawm lub tshuab dhos ib txwm siv xws li kev ua haujlwm sab hauv thiab lub ntsej muag kawg ntawm shafts thiab disks, qhov no machinery yog txawm peem rau nrog taper qhia bar ntaus ntawv uas enables no series rau txheej txheem taper xov.
Lub tshuab dhos tshuab no tau siv dav hauv kev lag luam suav nrog kev siv roj av, thee thiab cov zaub mov mining, tshuaj piping thiab geological prospecting, nws yog cov cuab yeej siv tau zoo hauv kev ua thiab kho cov yeeb nkab drilling, drilling pas nrig, xov txuas thiab lwm yam.