Chain Grades: Comparing Grade 30, Grade 43, Grade 70 ...
2018-4-23u2002·u2002Chain grades are determined by calculating newtons per square millimeter, using the formula 'N/mm 2 '. Where 'mm' is the area of the two cross-sections of a single chain link, and 'N' is newtons. A newton is approximately 0.224805 lbs. So, to determine a chain grade, manufacturers must find the ultimate breaking strength.
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