DIN985/ DIN982 /DIN6924 /ISO7040 NYLON INSERT LOCK NUTS ,We all adopt low carbon steel and 35 # steel or 45 # steel materials to be processed and formed by cold heading machine, and then tap and embed nylon. If it is grade 8 or 10 reheat treatment and tempering, then embed nylon ring, and finally galvanize or blacken. This product is widely used in various machinery, medical treatment, auto parts, and shipbuilding industries. The product is mainly embedded into nylon through bolt threads to achieve locking effect