When the number of chain links of the chain is odd, the head and tail of the chain are both outer chain links or inner chain links. At this time, the chain links used to connect the head and tail of the chain are transition chain links. The transition chain link will produce additional bending stress during operation, which has a great influence on the strength of the chain. Its ultimate tensile strength is 80% of the normal. Therefore, it is not recommend to use the transition chain link under heavy working conditions.