Chain Grades And Markings

The chain grade numbers which manufacturers use are actually one tenth of the actual grades.

Chain grades and markings. Only chain fully compliant with all aspects of en818 2 can be used in chain slings certified to en818 4. All chain assemblies arrive fully assembled and ready for use. Chain grades one of the safety measures implemented was to place chain in grades based on the ultimate breaking strength of that chain. Chain spec basics grades and links explained.

Therefore our grade 80 is 800 grade 70 is 700 and so on. Grade 100 chain is a newer product and is becoming increasingly popular as a replacement for grade 80 chain. Grade refers to the tensile strength of the metal. Currently alloy chain of grade 80 or grade 100 should be used for overhead lifting.

Hackett grade 8 lifting chain is manufactured from alloy steel and complies fully with en818 2. You will only see a trace code on domestic chain. Chain grades are determined by calculating newtons per square millimeter using the formula n mm 2. This number is what we see today g30 g43 g70 g80 g100 and the common chain grades.

A second concern is finish for corrosion resistance. Newer and stronger still is grade 120 chain. The grade refers to the tensile strength of the chain. The astm states that alloy chain shall be able to elongate a minimum of 20 before fracture.

Where mm is the area of the two cross. Chain grades are a standard method for showing the ultimate breaking strength tensile strength of a chain. Chain strength chart working load limit comparisons chain strength is identified throughout our website by. A trace code can also identify the origin of the steel.

Grade 120 tie downs offer the highest strength available in the industry with 20 more strength than comparable grade 100 chain and up to 50 more strength than grade 80 chain. Grade 80 alloy chain is embossed with 8 80 or 800. Hackett grade 8 lifting chain is proof load tested to 2 5 times working load limit and is supplied in a black painted finish. When selecting chain there are 3 basic considerations.

Grade metal tensile strength diameter thickness of chain and coil opening size. Grades help determine what sort of applications are appropriate for a given chain. Grade 120 transport chain. Chain grades for overhead lifting g80 g100 or g120.

Considered premium quality by chain manufacturers it provides about 25 higher work load limits than grade 80 chain and is approved for overhead lifting applications. These types of chain have trace codes a combination of numbers and letters usually in sets of 2 or 3 which provide information about the manufacturing history of the chain.