Chain Grades And Markings

Chain grades are determined by calculating newtons per square millimeter using the formula n mm 2.

Chain grades and markings. When selecting chain there are 3 basic considerations. Currently alloy chain of grade 80 or grade 100 should be used for overhead lifting. Only chain fully compliant with all aspects of en818 2 can be used in chain slings certified to en818 4. Chain spec basics grades and links explained.

All chain assemblies arrive fully assembled and ready for use. Chain grades are a standard method for showing the ultimate breaking strength tensile strength of a chain. Where mm is the area of the two cross. The astm states that alloy chain shall be able to elongate a minimum of 20 before fracture.

Any lower grade chain should not be used. Grades help determine what sort of applications are appropriate for a given chain. A second concern is finish for corrosion resistance. Newer and stronger still is grade 120 chain.

Hackett grade 8 lifting chain is proof load tested to 2 5 times working load limit and is supplied in a black painted finish. Chain grades for overhead lifting g80 g100 or g120. Grade metal tensile strength diameter thickness of chain and coil opening size. 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.

The chain grade numbers which manufacturers use are actually one tenth of the actual grades. Working load limits wll in pounds the higher the wll the stronger the chain. Chain grades one of the safety measures implemented was to place chain in grades based on the ultimate breaking strength of that chain. Grade 120 transport chain.

The grade refers to the tensile strength of the chain. Therefore our grade 80 is 800 grade 70 is 700 and so on. 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. Hackett grade 8 lifting chain is manufactured from alloy steel and complies fully with en818 2.

Grade 80 alloy chain is embossed with 8 80 or 800. Chain strength chart working load limit comparisons chain strength is identified throughout our website by. You will only see a trace code on domestic chain. A trace code can also identify the origin of the steel.

Chain and hooks are embossed with grade 100 markings for easy identification. 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.