Transport chains, also known as tie-down chains or load chains, come in various types and ratings, each designed for specific applications and load capacities. The most common types include Grade 30, Grade 43, Grade 70, Grade 80, Grade 100 and Grade 120 chains. These chains come in different size chain links from ¼” all the way up to 5/8” typically – but can even be larger than that.
All chains have a Working Load Limit – known as WLL. This is the safest weigh limit that a chain should be used for. Note that the WLL is different than the break strength which is considerably higher than WLL. The chain link sizes affect WLL and break strength, but LENGTH of chain does not affect strength.
- Grade 30, also known as proof coil chain, is used for general-purpose applications but is not suitable for overhead lifting.
- Grade 43, or high-test chain, is stronger and often used for binding and logging.
- Grade 70, transport chain or trucker’s chain, is widely used in the trucking industry due to its high strength and durability, making it ideal for securing heavy loads.
- Grades 80 and 100 and 120 are alloy chains used in rigorous applications, including overhead lifting and heavy-duty tie-downs, with Grade 120 being the strongest and most versatile.
The lower grade chains can actually snap due to a lower grade of steel when used above their weight rating. Higher grade chains are more likely to stretch if used under excessive load – however any chain will break at some point when subjected to extreme loads. When a chain breaks under excessive load it can snap and fly back toward the user causing extreme injury and or death.
Choosing the appropriate chain type and rating is crucial for ensuring safety and compliance with industry standards. Grade 70 is by far the most popular in general transport and the trucking industry and is usually stamped with “Grade 70” on the links.