Chain grade is the metal's tensile strength. Manufacturers use the grade number to indicate a chain's break strength. When a chain's grade is high, the greater is its break strength. A galvanized chain indicates the quantity of carbon present in the steel.
What does the grade of a chain mean?
Chain grades are a standard method for showing the ultimate breaking strength (tensile strength) of a chain. Grades help determine what sort of applications are appropriate for a given chain. Chain grades are determined by calculating newtons per square millimeter, using the formula “N/mm2”.
How do you determine a chain grade?
Just look for the “L” and then the number after it. Each number following the “L” corresponds with a grade of chain. On grade 70 this can also show that the chains are DOT approved! The “L” represents Laclede and our commitment to high quality chain products.
