Grade refers to the tensile strength of the metal.
Grade 43 chain breaking strength.
The wll wroking load for chain is usually defined of the ubs ultimate breaking strength expressed in pounds for all chain types except g4 grade 40 htchain has the wll defined as 1 3 of the ubs.
Most common grades for anchor chain are grade 30 bbb proof coil grade 40 ht chain strength table.
One of the safety measures implemented was to place chain in grades based on the ultimate breaking strength of that chain.
See chart for astm specification number.
Not to be used for overhead lifting.
Grade 30 aka proof coil has less carbon and is good service duty chain.
This number is what we see today g30 g43 g70 g80 g100 and the common chain grades.
Available in self colored shot blast electro galvanized powder coated and hot galvanized finishes.
That number is the chain grade.
The american society of testing materials astm has published safety standards and regulations for these chain grades.
Grade 43 chain is embossed using a 43 or a g4.
So to determine a chain grade manufacturers must find the ultimate breaking strength.
Grade 43 high test chain 1 4 high strength medium carbon steel chain with good wear characteristics ideal for most tie down applications.
Grade 70 transport chain is also called grade 70 truckers chain as it s common in securing loads for over the road hauling.
Grade 70 chain is embossed using a 7 70 or 700.
Then divide that number by 224805 to determine ultimate breaking strength in newtons.
It is not rated safe for overhead lifting.
The important thing to look for on the chain is a 4 stamped onto the link.
In the hot dip process this chain is specially shot peened before galvanizing to create long lasting protection against corrosion.
The manufacturers refer to this chain as grade 4 grade 40 and grade 43.
The grade number used by manufacturers is an indicator toward the ultimate break strength of chain.
Grade 80 alloy chain is heat treated making it.
The number after each letter is n mm 2.
Bbb chain links will have bbb or 3b or g3 or g30 on it while ht chain will have g4 or g40 or g43 stamped onto the side of the link.
Next take that number and divide by the total area of two cross sections of a single link.
Grade 30 grade 43 grade 70 grade 80 grade 100 grade 120 tie down load securement printed wall charts available call toll free for details 866 392 2829 or contact us.
Grade 43 aka grade 40 has higher tensile strength and abrasion resistance and comes with a higher price tag.
Chain is graded based on the ultimate breaking strength of the chain measured in n mm 2.
Lower chain grades g30 and g43 grade 30 chain.
It is unclear why the wll.
