Nylon insert lock nut is a hex self-locking nut with a built-in nylon insert, designed specifically for vibration working conditions. During tightening, the nylon ring is tightly pressed with the bolt thread, generating stable friction resistance to effectively prevent the nut from loosening due to vibration and impact. The product supports materials such as carbon steel, 304/316 stainless steel, and the surface can be treated with zinc plating, black oxide, passivation, etc. It complies with mainstream standards such as GB/T889, DIN985, ISO7040, with specifications covering M3-M36, and can match all kinds of metric bolts.