Lub npe tsis zoo li qub, tab sis lub ntsiab lus yog tib yam nkaus. Nws yog txhua tus kheej tapping. Kev ua haujlwm tseem ceeb ntawm tus kheej tapping screws yog tias lawv tsis tas yuav siv nrog ceev. Nyob rau hauv cov nqe lus ntawm tus nqi, ib tug loj tus naj npawb ntawm lawv tau txais kev cawmdim. Yuav tsis muaj nqi rau cov txiv ntseej.
Tseem ceeb nta Txawm hais tias muaj ntau ntau hom stainless hlau screws, lawv txhua tus muaj cov nram qab no tseem ceeb nta:
(1) Feem ntau yog ua los ntawm cov khoom thauj (99% ntawm tag nrho cov khoom). Nws tuaj yeem ua tau los ntawm cov hlau tsis muaj steel los yog cov hlau uas tsis yog ferrous.
(2) Cov khoom yuav tsum tau sov kho. Carbon steel self-tapping screws yuav tsum yog carburized thiab stainless hlau screws yuav tsum yog khoom tov hardened. Yog li ntawd tus kheej tapping screws tau raws li tus txheej txheem tus qauv ntawm cov khoom siv thiab kev ua haujlwm.
(3) Cov khoom muaj ib qhov chaw siab tawv thiab muaj lub zog zoo nyob hauv tus ntxhais. Qhov ntawd yog "puab sab nraum zoov xwb." Qhov no yog qhov tseem ceeb ntawm cov hlau tsis muaj hlau tsis muaj kev sib tw. Yog tias cov tawv tawv tsis qis, qhov ntsia hlau tsis tau muab tso rau hauv lub cev puag; Yog hais tias tus tub ntxhais muaj kev txom nyem, lub hau yuav txiav tawm thiab siv tsis tau. Yog li ntawd, "sab hauv muag sab nraud xwb" yog qhov ntaiv ntawm tus kheej kom ua tau raws li kev ua haujlwm.
(4) Cov nplais ntawm cov khoom xav tau kev tiv thaiv kev tiv thaiv saum npoo, uas yog feem ntau electroplating. Qee cov khoom yuav tsum tau kho phosphate (phosphating). Xws li: phaj phaj nws tus kheej tapping screws feem ntau phosphating.
(5) Cov txheej txheem rau kev lag luam. Nws pom zoo kom siv high-speed txias heading machines thiab high-speed xov rolling cav tov los yog high-speed planetary xov rolling cav tov kom paub cov khoom zoo. Lub taub hau ntawm tus kheej tapping tob hau ua li no yog qhov zoo tsim thiab xov zoo yog siab.