Lub ntsiab lus dav dav rau qeb ntawm cov khoom siv kho tshuab siv kom ruaj ntseg koom nrog ob lossis ntau yam khoom (lossis cov qauv tsim) rau hauv ib lub rooj sib txoos.
Fasteners yog cov chav kawm dav siv ntawm cov khoom siv kho tshuab tsim los rau kev ruaj ntseg fastening. Lawv ua haujlwm rau ntau yam kev lag luam- suav nrog lub zog, hluav taws xob, khoom siv hluav taws xob, tshuab, tshuaj, metallurgy, molding, thiab hydraulics- thiab muaj nyob rau hauv txhua yam ntawm machinery, khoom siv, tsheb, nkoj, railways, txuas hniav, thiab cov tsev rau cov qauv, cov cuab yeej, cov cuab yeej, thiab ntau yam khoom siv. Raws li cov feem ntau siv yooj yim mechanical Cheebtsam, lawv yog yus muaj los ntawm ib tug lossis loj ntau yam ntawm hom thiab specifications, muaj ntau yam kev ua tau zoo muaj peev xwm thiab kev siv, thiab ib tug high℃ntawm standardization, serialization, thiab interchangeability. Yog li ntawd, cov fasteners uas ua raws li cov qauv tsim hauv lub tebchaws feem ntau hu ua "standard fasteners" lossis "standard parts."