This self-locking hex nut, also known as a lock nut, features a non-metallic (nylon) insert that helps prevent the nut from loosening due to vibration or mechanical stress. Manufactured to DIN 985 and ISO 10512 standards, this Grade 5 nut is commonly paired with Grade 5.6 or 5.8 fasteners for pressure vessel applications. Made from steel with an electrolytic zinc plating, it's well-suited for indoor use or environments with minimal exposure to the elements. This version comes with a metric fine thread.