Nylon Insert Lock Nuts, also known as Nyloc Nuts or anti-vibration lock nuts, are high-performance self-locking fasteners with a built-in nylon insert, featuring excellent vibration resistance and no need for additional locking components. Manufactured in compliance with DIN982, DIN985 and GB/T889.1 standards, they are made of carbon steel or stainless steel 304/316, paired with highly elastic PA66 nylon rings. The nylon insert creates lasting friction when threaded, effectively preventing loosening caused by vibration and impact, with an operating temperature range of -50°C to +120°C. Reusable and easy to install without washers, they are widely used in automotive, machinery and outdoor equipment. Available in sizes M3-M36 with zinc-plated or black oxide finishes for superior corrosion resistance, they are the ideal anti-loosening solution for high-vibration applications.