Qhov txuas tseem ceeb tshaj plaws hauv kev txhim kho thiab tsim cov fasteners yog tswj tau zoo. Muaj ntau qhov chaw kuaj xyuas loj los ntawm cov tswv yim los ua tiav cov khoom lag luam tiav, thiab cov chaw kuaj xyuas no muaj cov qauv tshuaj ntsuam sib txawv. Firstly, muaj cov xwm txheej cuam tshuam nrog kev pub mis, xws li pom, qhov loj me, cov ntsiab lus, kev ua tau zoo, thiab tshuaj xyuas ntawm cov tshuaj muaj teeb meem; Raws li cov txheej txheem, nws yog ntau ntxiv txog tsos, qhov loj me, cuam tshuam kev ntsuas, thiab kev lom zem kab; Kev kho kom sov tsom xam ntau ntawm tsos, hardness, torque, tensile lub zog, metallography, thiab li ntawd; Kev kho deg tsuas yog cuam tshuam nrog hydrogenlement kuaj, txheej, ntsev tsuag, thiab lwm yam. Nyob rau hauv cov nqe lus ntawm qhov loj me thiab tsos tshuaj xyuas, cov nquag yog anime, profilometer, sacm thiab cov duab Sterter (qhov no yog tag nrho cov neeg); Nyob rau hauv cov nqe lus ntawm cov neeg kho tshuab thiab tshuaj ntsuam xyuas, muaj tsuas yog cov tshuab hardness (rockwell thiab victers), lub tshuab tsom iav, thiab ntaus nrig ntawm lub tshuab tua hluav taws xob; Hais txog cov khoom kuaj, muaj cov anecaltral analyzer thiab cov ntsev pov tseg cov ntsev
