Cov qauv tsis muaj qhov ntsuas txog cov qauv, qhov loj, cov duab, kos cim thiab lwm yam tau raug siab, thiab cov kws kho mob cov khoom siv feem ntau siv xoom (ib feem), xws li ntsuas, tuav, pins, dov bearings thiab on. Tus qauv uas tsis yog-txheem ntsia hlau ntsia mas yog lub teb chaws uas tsis tau tsim cov qauv nruj, thiab tsis muaj lwm yam kev tsis sib xws, thiab lwm yam khoom siv yeem los ntawm lub tuam txhab. Muaj ntau ntau yam ntawm cov qauv uas tsis yog-cov qauv ntsia hlau ntsia, thiab tsis muaj ib qho qauv zoo heev.
Tam sim no, muaj ob hom non-txheem ntsia hlau ceev, ib qho yog hlau, uas yog, carbon steel. Ib qho yog hlau tsis muaj steel, ntawm chav kawm, tooj liab, txhuas ceev, tab sis cov no tsawg dua siv. Tooj tooj tseem tseem ceeb, thiab txhuas ceev yog tsis tshua siv. Cov kab nrig tsis yog tus qauv siv rau hauv cov ntawv thov uas yuav tsum tau nquag sib dhos thiab rhuav tshem, los yog feem ntau siv rau qhov chaw qhov chaw ntawm cov khoom txuas nrog.