Ib tus kheej -tapping ntsia hlau yog threaded fastener muaj peev xwm los tsim nws tus kheej threads; nws cov xov cross-section nta ib qho profile tshwj xeeb, xws li cov duab trilobular lossis pentagonal. Nws txoj hauv kev ua haujlwm suav nrog kev tsim cov xov sab hauv hauv lub pre-drilled lub qhov tiaj los ntawm qhov txias extrusion, yog li ua tiav kev cuam tshuam haum yam tsis tas yuav tsum muaj lub pre-tapping qhov.
Thaum cov xov profile ntawm cov ntsia hlau no zoo ib yam li cov qauv xov, nws txoj kab uas hla zoo yog loj dua; Tsis tas li ntawd, nws nta ib qho kev tsav dav hlau nyob rau ntawm qhov kawg, thiab nws lub shank muaj ib daim duab peb sab nkhaus -section. Hom ntsia hlau no tsis yog tsuas yog muaj kev tiv thaiv -loosing zog tab sis kuj tshem tawm qhov xav tau ua ntej - kais qhov hauv workpiece. Nws nthuav tawm ntau yam kev paub thiab kev lag luam zoo, suav nrog kev tshem tawm cov txheej txheem tapping, txo cov nqi tsim khoom, txhim kho kev ua haujlwm zoo, zoo dua preload quab yuam thiab kev vibration tsis kam, thiab txo qhov yuav tsum tau nruj torque.
