DXN chain lock and V-lock links are fully compatible with Class D chains due to their different individual designs for flat and vertical ring connections, guaranteeing excellent mechanical properties and fatigue life. 1. The design of the link ring adopts advanced CAD design software, and all stress analysis and optimization design are carried out with finite elements before manufacturing. 2. All raw materials are specially customized in British steel mills, and the alloy composition and size are strictly controlled to ensure that the link ring products can withstand the test of the harshest coal mining environment. In addition, each bundle of raw materials entering the factory is individually subjected to laboratory analysis and physical and chemical tests, and a file is established. 3. The forging blank is completely precision forged in the UK's premier stampings forging factory. The heating adopts medium frequency heating and infrared temperature monitoring to prevent the grain size and oxidative decarbonization during the forging process. 4. The processing is completely processed by a CNC machining center. Each pair of half rings is loaded once and processed once, which ensures the high accuracy of the assembly size. 5. Heat treatment The heat treatment adopts Epson's controllable atmosphere multi-purpose furnace to ensure the consistency of the heat treatment process and prevent the oxidation and decarbonization of the heat treatment process. 6. Each pre-stretched link is 100% 2.5 times the working load test and flaw detection test before leaving the factory, which ensures the safety of the use process. 7. Quality file Each link has its own unique identification code, which can be traced back to each process and kept for 10 years.