Los ntawm txoj kev xav, countersunk hlau nplaum tseem ua raws li lub cev lub cev ntawm cov hlau nplaum, uas yog, lawv muaj cov hlau nplaum thiab tuaj yeem nyiam cov ntaub ntawv ferromagnetic. Txawm li cas los xij, lawv qhov tshwj xeeb countersunk tsim ua rau lawv yooj yim dua thiab ua haujlwm hauv kev siv. Piv txwv li, nyob rau hauv lub teb ntawm mechanical manufacturing, countersunk hlau nplaum yuav siv tau los kho los yog txoj hauj lwm qhov chaw, kom lawv stability thaum lub sij hawm ua los yog sib dhos; nyob rau hauv cov khoom siv hluav taws xob, cov hlau nplaum countersunk tuaj yeem siv los ua kom muaj kev sib nqus sib nqus los yog kev txhim kho, txhim kho qhov yooj yim ntawm cov khoom siv thiab cov neeg siv kev paub.