Fasteners yog qhov tseem ceeb ntawm cov khoom tseem ceeb hauv kev tsim khoom thiab kev tsim kho engineering; lawv lub luag haujlwm tseem ceeb yog los xyuas kom meej tag nrho kev ruaj ntseg thiab kev nyab xeeb ntawm cov qauv los ntawm kev sib txuas, kev ruaj ntseg, lossis xauv ob lossis ntau qhov chaw ua ke.
Fasteners ua tiav kev sib txuas los ntawm kev sib txhuam, kev sib tshuam, lossis kev thauj khoom ua ntej, nrog cov qauv tsim uas sib npaug ntawm lub zog, tiv thaiv corrosion, thiab yooj yim ntawm installation. Piv txwv li, bolts koom nrog cov txiv ntseej, siv lub zog axial tsim los ntawm kev sib hloov mus rau cov khoom sib dhos kom nruj; rivets undergo yas deformation sau lub qhov txuas, tsim kom muaj kev ruaj ntseg; thiab snap-fit fasteners cia siab rau elastic deformation kom ua tau sai sai thiab disassembly.