Dav siv lub sijhawm tseem ceeb nrog qhov yuav tsum tau ua kom raug, nrog rau kev cuam tshuam loj, kev vibration lossis alternating load.
Feem ntau siv nyob rau hauv txoj kev loj thiab railway choj, industrial thiab civil vaj tse, yees, cranes.Qhov no yog screws ua ke nrog bolts.