The strength of a chain is determined by its grade, which indicates the tensile strength and other mechanical properties of the chain. The higher the grade, the stronger the chain. However, it's important to note that different types of chains, such as those used for different purposes or made from different materials, may have their own grading systems. In general, here are the commonly used grading systems for chains:

    Grade 30 Chain: Grade 30 chain, also known as proof coil chain, is a low-grade chain commonly used for general-purpose applications. It has a tensile strength of approximately 30,000 pounds per square inch (psi). Grade 30 chain is suitable for lighter-duty tasks, such as securing loads, general lifting, and towing applications.

    Grade 43 Chain: Grade 43 chain, also known as high-test chain, is a medium-grade chain with a higher tensile strength than Grade 30. It has a tensile strength of around 43,000 psi. Grade 43 chain is stronger and more durable than Grade 30, making it suitable for heavier-duty applications such as trucking, logging, and agriculture.

    Grade 70 Chain: Grade 70 chain, also known as transport chain or tie-down chain, is a high-strength chain primarily used for transportation and cargo control. It has a significantly higher tensile strength of approximately 70,000 psi. Grade 70 chain is specifically designed for securing heavy loads and is commonly used in the trucking and transportation industry.

    Grade 80 Chain: Grade 80 chain is a high-strength alloy steel chain that provides even greater strength and durability compared to Grade 70 chain. It has a tensile strength of approximately 80,000 psi. Grade 80 chain is frequently used in demanding lifting and rigging applications, particularly in the construction, mining, and marine industries.

    Grade 100 Chain: Grade 100 chain is the highest-grade chain available commercially. It is an ultra-high-strength chain with a tensile strength of approximately 100,000 psi. Grade 100 chain is designed for the most demanding lifting and overhead lifting applications, where safety and maximum strength are paramount.

Shanghai Ying Yu Port Machinery Co., Ltd. was founded in 2011. It is famous China Tsubaki roller chain manufacturers