Cov yam ntxwv tseem ceeb ntawm cov ntsia hlau yog tias nws yog cov khoom siv kho tshuab uas siv lub hauv paus ntsiab lus ntawm cov dav hlau inclined thiab kev sib txhuam kom ua tiav txoj haujlwm nrawm. Nws cov qauv tseem ceeb yog shank nrog cov xov sab nraud. Kev sib hloov ua kom muaj zog axial los txuas thiab kho ntau qhov chaw. Nws feem ntau muaj plaub ntu: lub taub hau, shank, threads, thiab taub. Screws yog siv dav hauv ntau yam xwm txheej, los ntawm cov khoom siv hluav taws xob mus rau kev tsim kho engineering.
Nyob ntawm lawv daim ntawv thov thiab cov qauv, cov ntsia hlau tuaj yeem muab faib ua ntau hom, xws li tshuab screws, tus kheej -tapping screws, thiab woodworking screws. Lawv kuj tau ua los ntawm ntau cov ntaub ntawv, suav nrog carbon steel, stainless hlau, thiab aluminium alloys, kom ua tau raws li lub zog thiab kev tiv thaiv corrosion ntawm qhov chaw sib txawv.
Lawv lub taub hau duab (xws li countersunk taub hau, puag ncig lub taub hau, thiab hex lub taub hau) thiab txoj kev ua (xws li Phillips lub taub hau, lub taub hau taub hau, thiab lub taub hau taub hau taub hau) kuj sib txawv kom tau raws li qhov sib txawv ntawm qhov chaw sib txawv thiab qhov xav tau torque.
