Chain Breaking Strength

Chains must be inspected regularly to make sure it is safe to use.

Chain breaking strength.

Just as important as tensile strength is a chain s fatigue strength. See chart for astm specification number. Tensile strength represents how much load a chain can withstand under a one time load before breaking. The higher the grade the greater the break strength.

Chains have a working load limit or wll of approximately one third of their break strengths the amount of force the chains can withstand before they break. The critical factors in a chain s fatigue strength is the quality of steel used to. This number is what we see today g30 g43 g70 g80 g100 and the common chain grades. Chain is embossed with both the grade and size so you can determine.

The wll is different from the tensile or breaking strength. Chain grades are a standard method for showing the ultimate breaking strength tensile strength of a chain. The wll is a quarter or a fifth of the chain s breaking strength. The number after each letter is n mm 2.

One of the safety measures implemented was to place chain in grades based on the ultimate breaking strength of that chain. Toll free 866 392 2829 ph 918 392 2829 f 918 392 2833. Grades help determine what sort of applications are appropriate for a given chain. How to determine a chain s working load limit.

Every piece of webbing buckle ratchet and end hardware has its own number associated with both its wll and break strength. Grade 30 aka proof coil has less carbon and is good service duty chain. The most common measure of roller chain s strength is tensile strength. When it comes to ratchet straps winch straps and just about any other type of strap in the cargo industry the words working load limit wll and breaking or break strength are commonly seen.

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. Grade 43 aka grade 40 has higher tensile strength and abrasion resistance and comes with a higher price tag. The wll of a chain is determined by both the grade and the diameter. What is break strength vs.

Chain grades are determined by calculating newtons per square millimeter using the formula n mm 2. Lower chain grades g30 and g43. Chain grades what does g30 g43 g70 g80 g100 and g120 mean. With galvanized chain it basically boils down to how much carbon is in the steel.

Chain manufacturers set the wll to determine the maximum force that can be used on the product.