Lub pob ntsia hlau tsav yog ib qho kev sib dhos uas hloov cov lus tsa suab mus rau cov lus tsa suab (lossis lwm yam). Nws muaj lub pob ntsia hlau thiab lub pob txiv ntoo ntim raws li kev sib dhos nrog cov khoom siv rov ua dua tshiab. Lub interface ntawm lub pob ntsia hlau thiab cov txiv ntoo yog tsim los ntawm cov khoom uas yob hauv cov ntawv sib txuam. Nrog dov cov ntsiab lus, lub pob ntsia hlau tsav muaj qhov sib txhuam coefficient (feem ntau txog 98 feem pua). Cov rog xa mus tau muab faib rau ntau lub npas, muab qhov sib npaug qis rau ib pob sib piv.
Tsis tshua muaj kev sib txhuam hauv pob screws yields siab mechanical efficiency piv rau lwm txoj kev. Lub pob ntsia hlau raug ua tau zoo 90 feem pua, piv rau 20 mus rau 25 feem pua kev ua haujlwm ntawm Acme txhuas ntsia hlau ntawm qhov sib npaug. Tsis muaj zawv zawg kev sib txhuam ntawm cov txiv ntseej thiab cov ntsia hlau qiv nws tus kheej kom ntev lub neej ntawm cov ntsia hlau sib dhos (tshwj xeeb tshaj yog tsis muaj -backlash systems), txo qis sijhawm rau kev saib xyuas thiab hloov qhov chaw, thaum tseem txo qis kev thov rau lubrication. Qhov no, ua ke nrog lawv cov txiaj ntsig kev ua tau zoo thiab txo cov kev xav tau ntawm lub zog, tuaj yeem cuam tshuam cov nqi pib ntawm kev siv pob screws.
Ball screws may also reduce or eliminate backlash common in lead screw and nut combinations. The balls may be preloaded so that there is no "wiggle" between the ball screw and ball nut. This is particularly desirable in applications where the load on the screw varies quickly, such as machining tools.