This self-locking hex nut, also known as a lock nut, features a non-metallic insert (nylon ring) that helps prevent the nut from loosening due to vibration or mechanical stress. It's manufactured to DIN 985 and ISO 10511 standards and comes with metric threading. Made from grade 5 steel, it's commonly paired with grade 5.6 or 5.8 fasteners in pressure vessel applications. The electro-galvanized finish makes it well-suited for indoor use or environments with minimal exposure to the elements.