This self-locking hex nut, also known as a lock nut, features a built-in mechanism that helps prevent it from loosening under vibration or mechanical stress. The nut is manufactured to DIN 7967 standards from spring steel. Its electrolytically galvanized finish makes it suitable for indoor use or applications with very mild exposure. The nut comes with metric threading. Warning: the electrolytic treatment process used on these products carries a risk of hydrogen embrittlement.