DIN 985 Nuts: Chrome-plated Steel - Stainless Steel 304 - Stainless Steel 316

Nylon insert lock nuts, also known as METRIC DIN 985 standard nylon insert lock nuts, are a common type of torque lock nut. They are small in size and feature a non-metallic (nylon/polyamide) insert that creates friction between the threads of the connected components, thus increasing resistance to loosening