Kev siv U-bolts

U-shaped feem ntau yog siv rau hauv cov tsheb thauj khoom kom ruaj khov ntawm lub chassis thiab ncej ntawm lub tsheb. Piv txwv li, steel phaj springs txuas nrog U-bolts.
U-bolts yog siv dav, feem ntau yog siv rau kev teeb tsa hauv tsev, cov khoom siv sib txuas, tsheb thiab nkoj, txuas hniav, tunnels, railways, thiab lwm yam.